QuickMath.ai
Free Online Math Calculators
Fast, free math calculators that run in your browser. No uploads, 100% private.
Basic Calculators
Essential Math Tools for Everyday Use
Percentage Calculator
Calculate percentages easily with our free online calculator. Find percentage of a number, percentage change, and more.
Discount Calculator
Calculate discounts, sale prices, and savings instantly. Find final prices after percentage off, compare multiple discounts, and see how much you save.
Tip Calculator
Calculate tips easily and split bills among friends. Choose tip percentage, see total with tip, and divide evenly with our free tip calculator.
Random Number Generator
Generate random numbers with custom range. Support for decimals, unique numbers, and batch generation. Free online random number generator.
Number Base Converter
Convert numbers between binary, decimal, hexadecimal, and octal. Easy number base conversion. Free online number converter.
Unit Converter
Convert between different units of measurement. Length, weight, temperature, volume, and more. Free online unit converter.
Aspect Ratio Calculator
Calculate aspect ratios and resize dimensions. Keep proportions when resizing images or videos. Free online aspect ratio calculator.
math
Fraction Calculator
Free online fraction calculator. Add, subtract, multiply, and divide fractions. Get simplified results, decimals, and mixed numbers instantly.
GCD & LCM Calculator
Calculate GCD (Greatest Common Divisor) and LCM (Least Common Multiple) of two or more numbers. Shows prime factorization and step-by-step solutions.
Prime Number Checker
Check if any number is prime. Find all factors, prime factorization, and nearest prime numbers. Free online prime number calculator.
Factorial Calculator
Calculate factorials (n!), permutations P(n,r), and combinations C(n,r). Free online factorial calculator with step-by-step formulas.
Square Root Calculator
Calculate square roots, cube roots, and nth roots of any number. Get simplified radical form and decimal results. Free online root calculator.
Exponent Calculator
Calculate exponents and powers easily. Compute x raised to the power of n with scientific notation, expanded form, and negative exponents.
Logarithm Calculator
Calculate natural logarithm (ln), common logarithm (log10), binary logarithm (log2), and custom base logarithms. Free online log calculator.
Modulo Calculator
Calculate modulo (remainder) and quotient. Understand mathematical mod operation vs JavaScript remainder. Free online modulo calculator.
Absolute Value Calculator
Calculate absolute values, distance between points, and understand absolute value properties. Free online absolute value calculator.
Scientific Calculator
Free online scientific calculator. Calculate sin, cos, tan, log, ln, exponents, factorials, and more. Supports radians and degrees with memory functions.
Quadratic Equation Calculator
Solve quadratic equations instantly. Find real and complex roots, discriminant, and vertex for any quadratic equation ax² + bx + c = 0.
Combination Calculator (nCr)
Calculate combinations (nCr) instantly. Find how many ways to choose r items from n items when order doesn't matter. Free combination calculator.
Permutation Calculator (nPr)
Calculate permutations (nPr) instantly. Find how many ways to arrange r items from n items when order matters. Free permutation calculator.
Binary Calculator
Perform binary arithmetic and logical operations. Add, subtract, multiply, divide, AND, OR, XOR binary numbers. Convert between binary, decimal, and hex.
Hexadecimal Calculator
Perform hexadecimal arithmetic operations. Add, subtract, multiply, divide hex numbers. Convert between hexadecimal, decimal, and binary.
geometry
Area Calculator
Calculate area and perimeter of rectangles, squares, triangles, circles, trapezoids, parallelograms, and ellipses. Free online area calculator.
Perimeter Calculator
Calculate perimeter and circumference of rectangles, squares, triangles, circles, polygons, and more. Free online perimeter calculator.
Volume Calculator
Calculate volume and surface area of cubes, spheres, cylinders, cones, pyramids, and more. Free online 3D volume calculator.
Pythagorean Theorem Calculator
Calculate hypotenuse or legs of a right triangle using the Pythagorean theorem. Find Pythagorean triples. Free online calculator.
Triangle Calculator
Calculate all triangle properties: sides, angles, area, perimeter, heights. Solve using SSS, SAS, ASA, or AAS. Free online triangle calculator.
Circle Calculator
Calculate circle properties: radius, diameter, circumference, area, arc length, sector area, and chord length. Free online circle calculator.
Rectangle Calculator
Free rectangle calculator. Find area, perimeter, diagonal, and dimensions from length/width or area/perimeter. Instant results with formulas.
Sphere Calculator
Free sphere calculator. Calculate volume, surface area, radius, diameter from any known value. Instant results with formulas and diagrams.
Cylinder Calculator
Free cylinder calculator. Calculate volume, total surface area, lateral area, and base area from radius and height. Includes formulas and diagram.
Cone Calculator
Free cone calculator. Calculate volume, surface area, slant height from radius and height. Includes all formulas and visual diagram.
statistics
Average Calculator
Calculate mean, median, mode, range, sum, and more. Free online average calculator for statistics and data analysis.
Standard Deviation Calculator
Calculate standard deviation, variance, mean, and other statistics for sample and population data. Free online standard deviation calculator.
Variance Calculator
Calculate variance for sample and population data with step-by-step breakdown. See standard deviation, mean, and sum of squared deviations.
Percentile Calculator
Calculate percentiles, quartiles, deciles, and percentile ranks for your data. Find Q1, Q2, Q3, IQR and more. Free online percentile calculator.
Z-Score Calculator
Calculate z-scores from raw scores, find raw scores from z-scores, and convert between z-scores and percentiles. Free online z-score calculator.
Probability Calculator
Calculate probability for single events, multiple events, conditional probability, combinations (nCr), and permutations (nPr). Free probability calculator.
Correlation Calculator
Calculate Pearson correlation coefficient (r), R-squared, and linear regression. Analyze relationship between variables. Free online correlation calculator.
Sample Size Calculator
Calculate required sample size for surveys and research. Supports confidence levels, margin of error, and finite population correction.
Confidence Interval Calculator
Calculate confidence intervals for population mean and proportion. Supports multiple confidence levels. Free online confidence interval calculator.
Linear Regression Calculator
Free linear regression calculator. Find slope, intercept, correlation coefficient, R-squared, and make predictions. Includes scatter plot visualization.
Mean, Median, Mode Calculator
Calculate mean, median, and mode from a set of numbers. Also find range, sum, min, max, and count. Free statistics calculator.
Financial Calculators
Plan Your Finances with Precision
Loan Calculator
Calculate loan payments, interest rates, and amortization schedules. Free online loan calculator for mortgages, car loans, and personal loans.
Mortgage Calculator
Calculate your monthly mortgage payment, total interest, and view amortization schedule. Free mortgage calculator with down payment and PMI options.
Investment Calculator
Calculate investment returns, compound interest, and future value. Plan your investments with our free ROI and growth calculator.
Compound Interest Calculator
Calculate compound interest on your investments. See how your money grows over time with our interactive compound interest calculator and growth chart.
Salary Calculator
Calculate your salary conversions between hourly, monthly, and annual. Estimate net pay after taxes with our free salary calculator.
Break-Even Calculator
Calculate your business break-even point. Find how many units you need to sell to cover costs with our free break-even analysis calculator.
Timesheet Calculator
Calculate your work hours and pay with our free timesheet calculator. Track daily hours, overtime, breaks, and generate weekly summaries.
Currency Converter
Free currency converter. Convert between USD, EUR, GBP, JPY, and 40+ currencies. Quick and easy exchange rate calculations.
Income Tax Calculator
Free income tax calculator. Calculate federal tax, effective rate, marginal rate using 2024 US tax brackets. Supports all filing statuses.
ROI Calculator
Free ROI calculator. Calculate simple ROI, annualized return (CAGR), and compare investments. Includes future value projections.
Inflation Calculator
Free inflation calculator. See how inflation erodes purchasing power over time. Calculate future equivalent values and real returns.
Net Worth Calculator
Free net worth calculator. Track your assets and liabilities to calculate total net worth. Includes debt-to-asset ratio and milestone tracking.
Savings Calculator
Free savings calculator. Calculate future value with compound interest and monthly contributions. See year-by-year growth projections.
Retirement Calculator
Free retirement calculator. Calculate retirement savings needs, project future value, and check if you're on track. Uses 4% withdrawal rule.
Debt Payoff Calculator
Free debt payoff calculator. Compare avalanche vs snowball methods. See total interest, payoff time, and savings from extra payments.
Markup Calculator
Free markup calculator. Calculate markup percentage, profit margin, selling price, and profit from cost. Includes industry markup benchmarks.
Margin Calculator
Free margin calculator to calculate gross margin, operating margin, and net profit margin. Includes P&L breakdown and industry comparisons.
Hourly Rate Calculator
Free hourly rate calculator. Convert salary to hourly rate, hourly to annual salary, and calculate freelance consulting rates.
Emergency Fund Calculator
Free emergency fund calculator. Calculate your target emergency fund, track savings progress, and get personalized recommendations based on your risk level.
Budget Calculator
Free budget calculator using the 50/30/20 rule, zero-based budgeting, and more. Calculate needs, wants, and savings allocations from your income.
Property Tax Calculator
Free property tax calculator. Estimate annual and monthly property taxes by state. Includes assessment ratios and homestead exemptions.
Rent vs Buy Calculator
Free rent vs buy calculator. Compare total costs over time, including appreciation, taxes, maintenance, and opportunity cost of down payment.
Down Payment Calculator
Free down payment calculator. Calculate down payment by percentage, estimate closing costs, and plan your savings timeline for home purchase.
Closing Cost Calculator
Free closing cost calculator. Estimate buyer and seller closing costs, including title, appraisal, recording fees, and transfer taxes.
Rental Yield Calculator
Free rental yield calculator. Calculate cap rate, gross yield, net yield, and monthly cash flow for rental property investments.
Payroll Calculator
Free payroll calculator. Calculate take-home pay after federal, state, and FICA taxes. Includes 401(k), health insurance, and other deductions.
Depreciation Calculator
Free depreciation calculator. Calculate asset depreciation with straight-line, double declining, sum-of-years, and units of production methods.
Revenue Calculator
Free revenue calculator. Calculate revenue from sales, MRR/ARR for subscriptions, customer lifetime value, and growth forecasts.
Cost Per Unit Calculator
Free cost per unit calculator. Calculate unit costs with fixed and variable cost breakdown. Includes break-even analysis and economies of scale.
Inventory Turnover Calculator
Free inventory turnover calculator. Calculate turnover ratio, days in inventory, stock-to-sales ratio, and GMROI with industry comparisons.
Cash Flow Calculator
Free cash flow calculator. Calculate operating, investing, and financing cash flows. Includes free cash flow and full statement generation.
Business Valuation Calculator
Free business valuation calculator. Value your business using revenue multiples, EBITDA, P/E ratio, DCF, and asset-based approaches.
Credit Card Payoff Calculator
Free credit card payoff calculator. See how long to pay off debt, total interest cost, and how extra payments reduce payoff time.
Take-Home Pay Calculator
Free take-home pay calculator. Calculate net pay after federal tax, state tax, Social Security, Medicare, and deductions. Works for all 50 US states.
APR Calculator
Free APR calculator. Calculate annual percentage rate including origination fees, points, and closing costs. Compare loans by their true cost.
401(k) Calculator
Free 401(k) calculator. Project retirement savings with employer match, compound growth, and catch-up contributions. See your balance at retirement.
Amortization Calculator
Free amortization calculator. Generate full loan payment schedule with principal, interest breakdown. See how extra payments reduce interest and payoff time.
Home Affordability Calculator
Free home affordability calculator. Find out how much house you can afford based on income, debts, down payment, and DTI ratios. Get monthly payment breakdown.
Lease vs Buy Calculator
Free lease vs buy calculator. Compare car leasing vs buying costs including payments, down payment, and total cost.
Savings Goal Calculator
Free savings goal calculator. Find out how long to reach your savings target or how much to save monthly. Track milestones and interest earned.
College Savings Calculator
Free college savings calculator. Calculate monthly savings needed, compare 529 plans, estimate tuition costs, and track your progress.
Net Present Value (NPV) Calculator
Free NPV calculator. Calculate net present value, internal rate of return (IRR), payback period, and profitability index for investment analysis.
IRR Calculator (Internal Rate of Return)
Free IRR calculator. Calculate internal rate of return for investments with irregular cash flows. Compare IRR to hurdle rate.
Debt-to-Income Ratio Calculator
Free DTI calculator. Calculate your debt-to-income ratio for mortgage approval. See front-end and back-end ratios and understand qualification limits.
EMI Calculator
Free EMI calculator to calculate your loan EMI, total interest payable, and amortization schedule. Perfect for home loans, car loans, and personal loans.
SIP Calculator
Calculate your SIP returns with our free SIP calculator. Estimate future value of your systematic investment plan with monthly contributions.
VAT Calculator
Free VAT calculator to add or remove VAT from any amount. Supports UK, EU, and custom VAT rates. Calculate net, gross, and VAT amounts instantly.
GST Calculator
Free GST calculator for India. Calculate GST at 5%, 12%, 18%, 28% rates. Supports CGST/SGST for intra-state and IGST for inter-state transactions.
FIRE Calculator
Calculate your FIRE number and years to financial independence. Plan your early retirement with Lean FIRE, Coast FIRE, and Fat FIRE calculations.
Crypto Profit Calculator
Calculate cryptocurrency profits and losses including trading fees. Track multiple transactions and find your average cost basis.
Mining Profitability Calculator
Calculate cryptocurrency mining profitability for Bitcoin, Ethereum, and other coins. Estimate daily revenue, electricity costs, and ROI.
Gas Fee Calculator
Calculate Ethereum gas fees for transactions, swaps, NFT mints, and more. Compare costs across networks including Polygon, Arbitrum, and Optimism.
DeFi Yield Calculator
Calculate DeFi yields with compound interest. Estimate returns from lending, liquidity pools, and yield farming including impermanent loss.
NFT Profit Calculator
Calculate NFT trading profits including gas fees, marketplace fees, and royalties. Track your NFT portfolio performance.
Dividend Calculator
Calculate dividend income, yield, and growth projections. See how dividend reinvestment (DRIP) compounds your wealth over time.
Stock Profit Calculator
Calculate stock profit or loss including commissions and dividends. See annualized returns and tax implications.
Options Calculator
Calculate stock option profits, break-even prices, and Greeks (Delta, Gamma, Theta, Vega). Use Black-Scholes pricing for calls and puts.
Bond Yield Calculator
Calculate bond yield to maturity (YTM), current yield, duration, and convexity. Analyze bond pricing and risk metrics.
Dollar Cost Average Calculator
Calculate returns from dollar cost averaging. Compare DCA vs lump sum investing with price volatility simulation.
P/E Ratio Calculator
Calculate price-to-earnings ratio and analyze stock valuation. Compare to sector averages and estimate fair value.
ETF Expense Ratio Calculator
Calculate the true cost of ETF expense ratios over time. Compare low-cost vs high-cost funds and see how fees impact your investment returns.
Portfolio Rebalance Calculator
Calculate how to rebalance your investment portfolio. Get specific buy and sell amounts to match your target asset allocation.
Margin Call Calculator
Calculate margin call price and liquidation levels for margin trading. Understand maintenance margin requirements and avoid forced liquidation.
Short Sell Calculator
Calculate short selling profits, losses, and borrowing costs. Analyze risk scenarios and understand unlimited loss potential.
Freelance Rate Calculator
Calculate the hourly rate you need to charge as a freelancer based on your income goals, expenses, taxes, and billable hours.
Invoice Calculator
Calculate invoice totals with tax, discounts, and shipping. Generate professional invoice summaries with multiple line items.
Profit Margin Calculator
Calculate profit margin, markup percentage, and selling price. Compare margins across industries and find break-even points.
Time Tracking Calculator
Track work hours and calculate billable amounts. Calculate overtime, project time allocation, and earnings with detailed breakdowns.
Expense Calculator
Track business and personal expenses. Calculate reimbursements, tax deductions, and analyze spending by category with detailed breakdowns.
Mileage Calculator
Track business, medical, and charity mileage for tax deductions. Calculate IRS standard mileage rates and total tax savings.
Commission Calculator
Calculate sales commissions with flat, tiered, and graduated structures. See potential earnings and compare commission scenarios.
Tip Split Calculator
Calculate tips and split bills among groups. Split equally or by individual orders with customizable tip percentages.
Cash Register Calculator
Free cash register calculator. Calculate exact change with denomination breakdown for bills and coins. Perfect for cashiers and retail workers.
Breakeven Analysis Calculator
Free breakeven analysis calculator. Calculate breakeven point in units and revenue, contribution margin, and profit scenarios for your business.
Social Security Calculator
Free Social Security calculator. Estimate monthly benefits at different claiming ages and compare early vs delayed retirement.
RMD Calculator
Free RMD calculator. Calculate your Required Minimum Distribution from IRAs and 401(k)s using IRS tables.
CD Calculator
Free CD calculator. Calculate Certificate of Deposit earnings with different APY rates, terms, and compounding. Compare CD vs savings returns.
Roth IRA Calculator
Free Roth IRA calculator. Project your Roth IRA growth, check contribution limits and income eligibility, and estimate tax-free retirement savings.
Pay Raise Calculator
Free pay raise calculator. Calculate your new salary after a raise and compare pay across hourly, weekly, monthly, and annual.
Mortgage Payoff Calculator
Free mortgage payoff calculator. See how extra payments can help you pay off your mortgage early and save thousands in interest over the life of your loan.
Simple Interest Calculator
Free simple interest calculator. Calculate interest, principal, rate, or time using the simple interest formula. Compare simple vs compound interest.
Health Calculators
Track Your Health & Wellness
BMI Calculator
Calculate your Body Mass Index (BMI) with our free online calculator. Get instant results with health category classification.
Calorie Calculator
Calculate your daily calorie needs based on age, weight, height, and activity level. Get personalized nutrition recommendations.
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes. Find out how old you are precisely with our free age calculator.
Date Calculator
Calculate date differences, add or subtract days from dates, and find days between two dates. Perfect for planning deadlines, events, and countdowns.
Body Fat Calculator
Free body fat percentage calculator. Calculate body fat using US Navy method or BMI estimation. Get fat mass, lean mass, and body composition analysis.
Ideal Weight Calculator
Free ideal weight calculator. Calculate ideal body weight using Robinson, Miller, Devine, and Hamwi formulas. Compare with healthy BMI weight range.
BMR Calculator
Free BMR calculator. Calculate basal metabolic rate using Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle formulas. Know your resting calorie burn.
TDEE Calculator
Free TDEE calculator. Calculate total daily energy expenditure based on activity level. Get calorie targets for weight loss, maintenance, or muscle gain.
Lean Body Mass Calculator
Free lean body mass calculator. Calculate LBM using Boer, James, and Hume formulas. Estimate fat-free mass and body fat percentage.
Waist-to-Hip Ratio Calculator
Free waist-to-hip ratio calculator. Calculate WHR to assess cardiovascular health risks. Determine body shape and health category based on WHO guidelines.
Body Surface Area Calculator
Free body surface area calculator. Calculate BSA using multiple formulas including Du Bois and Mosteller. Essential for medication dosing calculations.
Heart Rate Calculator
Free heart rate calculator. Calculate max heart rate and training zones for fat burn, cardio, and aerobic exercise. Uses standard and Karvonen formulas.
Running Pace Calculator
Free running pace calculator. Calculate pace per km and mile, speed in km/h and mph, plus split times for 5K, 10K, half marathon, and marathon.
Calories Burned Calculator
Free calories burned calculator. Calculate calories burned for running, cycling, swimming, and 15+ activities using MET values. Compare activity efficiency.
One Rep Max Calculator
Free one rep max calculator. Calculate 1RM using Brzycki, Epley, Lander, Lombardi, and O'Conner formulas. Get percentage-based training loads.
Macro Calculator
Free macro calculator. Calculate daily protein, carbs, and fat needs based on your TDEE, activity level, and fitness goals. Multiple macro split options.
Protein Calculator
Free protein calculator. Calculate optimal daily protein intake based on weight, activity level, and fitness goals. Includes protein source reference.
Water Intake Calculator
Free water intake calculator. Calculate how much water you need daily based on weight, activity, and climate. Includes personalized drinking schedule.
Steps to Calories Calculator
Free steps to calories calculator. Convert steps to calories burned based on weight, stride length, and walking pace. Includes distance and time calculations.
Pregnancy Calculator
Free pregnancy calculator. Calculate due date, current week, trimester, and pregnancy milestones. Uses Naegele's rule for accurate estimation.
Ovulation Calculator
Free ovulation calculator. Calculate ovulation date, fertile window, and next period based on cycle length. Track daily fertility levels.
Sleep Calculator
Free sleep calculator. Calculate optimal bedtime or wake time based on 90-minute sleep cycles. Wake up refreshed by timing your sleep correctly.
Blood Alcohol Calculator
Free blood alcohol calculator. Estimate BAC based on drinks, weight, and time. Shows impairment level and time to return to sober state.
Medication Dosage Calculator
Free medication dosage calculator. Calculate drug doses by weight or concentration. Includes volume calculation and daily dosing frequency.
Period Calculator
Free period calculator and cycle tracker. Predict next period, ovulation day, and fertile window. Track your menstrual cycle for up to 12 months ahead.
Weight Loss Calculator
Free weight loss calculator. Calculate daily calories needed, time to reach goal weight, and get a week-by-week projection. Safe, science-based approach.
A1C Calculator
Free A1C calculator. Convert between A1C and average blood glucose (eAG). Check diabetes risk categories and understand your 3-month blood sugar average.
Keto Calculator
Free keto macro calculator. Calculate daily fat, protein, and net carb targets for the ketogenic diet based on your body composition and goals.
Blood Pressure Calculator
Free blood pressure calculator. Check if your blood pressure is normal, elevated, or high. Get pulse pressure, MAP, and health recommendations.
Fertility Calculator
Free fertility calculator. Find your ovulation date, fertile window, best days to conceive, and estimated due date. Track your menstrual cycle for conception.
Pregnancy Weight Gain Calculator
Free pregnancy weight gain calculator. Find healthy weight gain based on BMI and week of pregnancy. IOM guidelines for singleton, twins, and triplets.
Child Growth Percentile Calculator
Free child growth calculator. Find your child's weight and height percentiles using CDC/WHO growth charts. Track development from birth to 18 years.
VO2 Max Calculator
Free VO2 max calculator. Estimate your maximal oxygen uptake with Cooper test, Rockport walk test, or beep test. Compare your cardiovascular fitness level.
Body Frame Size Calculator
Free body frame calculator. Determine if you have a small, medium, or large frame using wrist or elbow measurements. Get ideal weight range for your frame size.
Macro Ratio Calculator
Free macro ratio calculator. Find your ideal protein, carbs, and fat ratios for weight loss, muscle gain, keto, or maintenance. Get per-meal macro targets.
Intermittent Fasting Calculator
Free intermittent fasting calculator. Plan your 16:8, 18:6, 20:4, or OMAD fasting schedule. See eating windows, fasting benefits, and optimize your IF routine.
Bra Size Calculator
Free bra size calculator. Measure your band and bust to find your perfect bra size in US, UK, EU, and international sizing. Get sister size recommendations.
Pace Calculator
Free pace calculator. Find your running pace, speed, distance, or time. Convert between min/mile, min/km, mph, and km/h for running, walking, or cycling.
Target Heart Rate Calculator
Free target heart rate calculator. Find your optimal heart rate zones for fat burning, cardio, and peak performance.
Shoe Size Calculator
Free shoe size calculator and converter. Convert between US, UK, EU, and CM sizes for men, women, and kids. Measure foot length to find your perfect fit.
Blood Sugar Converter
Free blood sugar converter. Convert glucose levels between mg/dL and mmol/L. See normal ranges for fasting, post-meal, and A1C with diabetes risk assessment.
Body Type Calculator
Free body type calculator. Determine your somatotype (ectomorph, mesomorph, endomorph) based on measurements. Get personalized diet and workout recommendations.
Caffeine Calculator
Calculate safe caffeine intake based on your weight. Track daily consumption and see how caffeine affects your sleep.
Hydration Calculator
Calculate your daily water needs based on weight, activity level, climate, and lifestyle factors. Get a personalized hydration schedule.
Sleep Debt Calculator
Calculate your sleep debt and create a recovery plan. Track weekly sleep patterns and get personalized recommendations for better rest.
Heart Rate Zone Calculator
Calculate your heart rate training zones for optimal fitness. Get personalized cardio zones for fat burning, endurance, and performance.
Breathing Exercise Calculator
Free breathing exercise calculator with guided techniques. Practice box breathing, 4-7-8 relaxation, and custom breathing patterns for stress relief.
Due Date Calculator
Free pregnancy due date calculator. Calculate your expected delivery date based on last period, conception, or ultrasound.
time
Timezone Converter
Free online timezone converter. Convert time between cities like New York, London, Tokyo, Sydney and more. Supports UTC offsets and DST.
Time Duration Calculator
Free time duration calculator. Calculate hours, minutes, seconds between times. Add or subtract time intervals easily.
Work Hours Calculator
Free work hours calculator. Track daily working hours with breaks. Calculate weekly totals for payroll and time management.
Overtime Calculator
Free overtime calculator. Calculate overtime pay with 1.5x and 2x rates. Track regular and overtime hours for accurate payroll.
Days Until Calculator
Free days until calculator. Count days remaining to holidays, birthdays, vacations, and deadlines. Easy date countdown tool.
Business Days Calculator
Free business days calculator. Count working days between dates or add business days. Exclude weekends and holidays easily.
Week Number Calculator
Free week number calculator. Find ISO week number for any date. Shows day of year, quarter, and year progress.
Unix Timestamp Converter
Free Unix timestamp converter. Convert epoch time to date and date to timestamp. Supports seconds and milliseconds.
Leap Year Calculator
Free leap year calculator. Check if any year is a leap year. Find all leap years in a date range with explanations.
Date Difference Calculator
Free date difference calculator. Find exact years, months, weeks, and days between any two dates. Calculate age and time spans.
Time Card Calculator
Free time card calculator. Calculate work hours from clock in/out times. Track breaks and overtime for payroll processing.
Time Zone Meeting Planner
Free time zone meeting planner. Find optimal meeting times across timezones. See working hour overlaps for global teams.
Age in Days Calculator
Free age in days calculator. Find your exact age in days, hours, minutes, seconds. Discover fun life statistics.
Add Days Calculator
Free add days calculator. Add or subtract days, weeks, months, years from any date. Calculate future and past dates easily.
Countdown Calculator
Free countdown calculator. Create live countdowns to events, holidays, and deadlines. Track time remaining in real-time.
education
GPA Calculator
Free GPA calculator. Calculate your college or high school GPA from letter grades and credit hours. Standard 4.0 scale.
Grade Calculator
Free grade calculator. Calculate your overall course grade from assignments with optional weighting. Get letter grade conversion.
Final Grade Calculator
Free final grade calculator. Find out what score you need on your final exam to reach your target grade. Plan your study time.
Test Score Calculator
Free test score calculator. Calculate percentage and letter grade from correct answers. Set custom passing grade threshold.
Weighted Average Calculator
Free weighted average calculator. Calculate weighted mean with custom weights. See difference from simple average and contribution breakdown.
CGPA Calculator
Free CGPA calculator. Calculate cumulative GPA from multiple semesters. Track academic progress and GPA trend.
Percentage to GPA Calculator
Free percentage to GPA converter. Convert percentage to 4.0 and 10.0 scale GPA. See letter grade and grade level analysis.
SAT Score Calculator
Free SAT score calculator. Calculate total score and national percentile from section scores. Check college readiness benchmarks.
ACT Score Calculator
Free ACT score calculator. Calculate composite score and national percentile. Check college readiness benchmarks for all sections.
Class Rank Calculator
Free class rank calculator. Calculate percentile, quartile, and top percentage from your class rank. See students ahead and behind.
Study Time Calculator
Free study time calculator. Calculate recommended study hours per week based on credits and difficulty. Plan your schedule.
Reading Speed Calculator
Free reading speed calculator. Calculate your WPM and estimate time to read books. Find your reading level and improve.
Words Per Minute Calculator
Free typing speed test. Measure your words per minute (WPM) and accuracy. Interactive test with detailed performance analysis.
Flashcard Calculator
Free flashcard calculator. Plan spaced repetition schedule. Calculate daily reviews, total study time, and mastery date.
Course Credit Calculator
Free course credit calculator. Track completed credits, plan remaining semesters, and monitor degree progress.
science
Speed Calculator
Free speed calculator. Calculate speed, distance, or time with unit conversions. Supports km/h, mph, m/s.
Force Calculator
Free force calculator using F=ma formula. Calculate force, mass, or acceleration. Calculate weight from mass.
Energy Calculator
Free energy calculator. Calculate kinetic energy, potential energy, and work. Convert between joules, calories, kWh.
Power Calculator
Free power calculator. Calculate power from work/time or force/velocity. Convert watts, kilowatts, horsepower.
Momentum Calculator
Free momentum calculator. Calculate momentum p=mv. Solve elastic and inelastic collision problems.
Acceleration Calculator
Free acceleration calculator. Calculate acceleration from velocity, time, or distance using kinematic equations.
Density Calculator
Free density calculator. Calculate density, mass, or volume. Includes reference densities for common materials.
Pressure Calculator
Free pressure calculator. Calculate pressure from force/area or hydrostatic. Convert Pascal, bar, atm, psi, mmHg.
Frequency Calculator
Free frequency calculator. Calculate frequency from period or wavelength. Convert Hz, kHz, MHz, GHz.
Wavelength Calculator
Free wavelength calculator. Calculate wavelength from frequency. Identify radio, microwave, infrared, visible, UV, X-ray bands.
Ohm's Law Calculator
Free Ohm's Law calculator. Calculate voltage, current, resistance, and power. V=IR and P=VI formulas.
Wattage Calculator
Free wattage calculator. Calculate watts from voltage and current. Estimate electricity costs per day, month, year.
Electricity Cost Calculator
Free electricity cost calculator. Calculate energy bills for multiple appliances. Track kWh usage and costs.
Resistor Calculator
Free resistor calculator. Decode 4, 5, 6 band color codes. Calculate series and parallel resistance.
Capacitor Calculator
Free capacitor calculator. Calculate charge Q=CV, energy, series/parallel capacitance, and capacitive reactance.
LED Resistor Calculator
Free LED resistor calculator. Find the right resistor for your LED circuit. Series and parallel configurations supported.
Battery Life Calculator
Free battery life calculator. Estimate battery runtime from mAh capacity and current draw. Plan your electronics projects.
Voltage Divider Calculator
Free voltage divider calculator. Calculate output voltage, find resistor values, analyze load effects on voltage dividers.
Molecular Weight Calculator
Free molecular weight calculator. Enter a chemical formula to calculate molar mass and elemental composition.
Molarity Calculator
Free molarity calculator. Calculate solution concentration, moles, volume. Dilution calculator with C1V1=C2V2.
Subnet Calculator
Calculate subnet mask, network address, broadcast address, and host range. Free IP subnet calculator with CIDR notation support.
Color Converter
Convert colors between RGB, HEX, and HSL formats. Free color converter with preview and one-click copy for designers and developers.
Solar Panel Calculator
Calculate solar panel system size, costs, savings, and payback period. Includes federal tax credit and environmental impact estimates.
EV vs Gas Cost Calculator
Compare electric vehicle vs gas car total cost of ownership including purchase price, fuel, maintenance, and insurance over time.
Carbon Footprint Calculator
Calculate your personal carbon footprint from transportation, home energy, travel, and lifestyle. Compare to averages and find ways to reduce emissions.
Home Energy Audit Calculator
Analyze your home's energy efficiency. Get recommendations for improvements and estimate potential savings on utility bills.
Heat Pump Calculator
Calculate heat pump sizing, installation cost, energy savings, and payback period. Compare air source vs ground source systems.
Wind Turbine Calculator
Calculate wind turbine energy production, costs, and savings. Estimate annual output based on wind speed, turbine size, and site conditions.
Insulation Calculator
Calculate insulation needs for your home. Find recommended R-values, material costs, and energy savings by climate zone.
LED Savings Calculator
Calculate energy and cost savings from switching to LED bulbs. Compare incandescent, halogen, CFL vs LED with payback period and environmental impact.
Water Usage Calculator
Calculate your household water usage and costs. Estimate daily, monthly, and annual consumption with tips for saving water.
Rainwater Harvest Calculator
Calculate rainwater harvesting potential from your roof. Estimate collection, storage needs, cost savings, and environmental benefits.
Wind Chill Calculator
Free wind chill calculator. Calculate the feels-like temperature based on air temperature and wind speed. Includes frostbite risk warnings and safety tips.
Heat Index Calculator
Free heat index calculator. Calculate the feels-like temperature based on air temperature and humidity. Includes heat danger levels and safety warnings.
BTU Calculator
Free BTU calculator for HVAC sizing. Calculate the BTUs needed for heating and cooling your room based on size, climate, insulation, and sun exposure.
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Recipe Scaler
Free recipe scaler calculator. Adjust ingredient quantities for any serving size. Perfect for cooking and baking.
Cooking Conversion Calculator
Free cooking conversion calculator. Convert cups to tablespoons, ounces to grams, Fahrenheit to Celsius and more.
Baking Calculator
Free baking calculator. Calculate hydration, convert pan sizes, substitute yeast types. Perfect for bread baking.
Serving Size Calculator
Free serving size calculator. Calculate servings per package, portion sizes, and total nutrition information.
Food Cost Calculator
Free food cost calculator. Calculate ingredient costs, cost per serving, and food cost percentage for recipes.
Paint Calculator
Free paint calculator. Calculate gallons needed for walls, accounting for doors, windows, and coats.
Tile Calculator
Free tile calculator. Calculate number of tiles needed with wastage for floors and walls.
Flooring Calculator
Free flooring calculator. Calculate sq ft of flooring, boxes needed, and total cost for multiple rooms.
Concrete Calculator
Free concrete calculator. Calculate cubic yards and bags of concrete for slabs, footings, columns, and stairs.
Fuel Cost Calculator
Free fuel cost calculator. Calculate gas costs for road trips, daily commutes. Split fuel costs among passengers.
MPG Calculator
Free MPG calculator. Calculate fuel efficiency, gas mileage, and annual fuel costs for your vehicle.
Car Lease Calculator
Free car lease calculator. Calculate monthly payments, due at signing, and total lease cost with money factor.
Car Loan Calculator
Free car loan calculator. Calculate monthly payments, total interest, and amortization schedule for auto loans.
Home Improvement Calculator
Free home improvement calculator. Estimate renovation costs, materials, labor, and return on investment.
Moving Cost Calculator
Free moving cost calculator. Estimate moving company, truck rental, and total costs for local or long distance moves.
Pool Volume Calculator
Calculate swimming pool volume in gallons and liters. Supports rectangular, round, and oval pools. Free pool water volume calculator.
Mulch Calculator
Calculate how much mulch you need in cubic yards and bags. Free mulch calculator for landscaping and gardening projects.
Gravel Calculator
Calculate how much gravel you need in tons and cubic yards. Supports different gravel types. Free gravel calculator for landscaping.
Stair Calculator
Calculate stair dimensions including riser height, tread depth, stringer length, and building code compliance. Get material estimates.
Roof Pitch Calculator
Calculate roof pitch from rise/run, angle, or ratio. Find recommended roofing materials and calculate actual roof area from flat footprint.
Drywall Calculator
Calculate drywall sheets needed for your project including screws, tape, joint compound, and primer. Get material and cost estimates.
Fence Calculator
Calculate fence materials including posts, rails, pickets, and concrete. Estimate costs for wood, vinyl, chain link, and metal fencing.
Deck Calculator
Calculate deck materials including decking boards, joists, posts, and concrete. Estimate costs for wood, composite, and PVC decking projects.
Carpet Calculator
Calculate carpet needed for multiple rooms. Estimate square yards, linear footage, and total costs including padding, labor, and installation.
Wallpaper Calculator
Calculate how many rolls of wallpaper you need. Account for pattern repeats, room dimensions, and openings to get accurate material estimates.
Brick Calculator
Calculate how many bricks you need for walls, patios, and projects. Includes mortar, sand requirements, and cost estimates for different brick sizes.
Siding Calculator
Calculate siding materials for your home. Estimate squares needed, accessories, and costs for vinyl, fiber cement, wood, and other siding types.
Gutter Calculator
Calculate gutters and downspouts for your home. Estimate linear feet, components needed, and costs for aluminum, vinyl, steel, and copper gutters.
Board Foot Calculator
Free board foot calculator for lumber. Calculate board feet for multiple pieces of wood, estimate costs, and reference common lumber sizes.
Paver Calculator
Free paver calculator for patios and walkways. Calculate how many pavers you need, estimate costs, and get a materials list.
Sand Calculator
Free sand calculator. Calculate how much sand you need in tons, cubic yards, or bags for any landscaping project.
Soil Calculator
Free soil calculator for gardening. Calculate how much topsoil, garden soil, or compost you need in cubic yards, cubic feet, or bags for your garden beds.
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Depth of Field Calculator
Free depth of field calculator for photographers. Calculate DOF, hyperfocal distance, and near/far limits for any camera and lens.
Exposure Calculator
Free photography exposure calculator. Calculate equivalent exposures, ND filter compensation, and EV values for any camera.
Print Size Calculator
Free print size calculator for photographers. Calculate maximum print size at various DPI and check print quality.
BPM Calculator
Free BPM calculator with tap tempo feature. Convert BPM to milliseconds, calculate delay times for music production, and find note values for any tempo.
Tempo Calculator
Free tempo calculator for musicians. Calculate song length at different tempos, find practice tempos, and understand tempo markings from Largo to Prestissimo.
Key Transpose Calculator
Free key transpose calculator for musicians. Transpose songs between keys, find capo positions, calculate semitone intervals, and convert chord progressions.
Batting Average Calculator
Free batting average calculator for baseball. Calculate BA, OBP, slugging percentage, OPS, and total bases. Track game-by-game stats or season totals.
ERA Calculator
Free ERA calculator for baseball pitchers. Calculate ERA, WHIP, strikeout rate, K/BB ratio, and quality starts. Track game-by-game or season pitching stats.
Fantasy Points Calculator
Free fantasy sports points calculator. Calculate fantasy points for NFL (PPR, half-PPR, standard), NBA, MLB, and NHL with detailed scoring breakdowns.
Golf Handicap Calculator
Free golf handicap calculator using WHS formula. Calculate handicap index from score differentials, course handicap, playing handicap, and target scores.
Bowling Score Calculator
Free bowling score calculator. Calculate scores with strikes, spares, and bonus balls. Track frame-by-frame totals, statistics, and spare conversion rate.
Pace Per Mile Calculator
Free running pace calculator. Calculate pace per mile/km, predict finish times, plan race splits, and convert between miles and kilometers for any distance.
Fun Calculators
Entertainment & Viral Calculators
Dog Age Calculator
Convert your dog's age to human years using the latest science-based formula. Accurate dog age calculator based on breed size and DNA research.
Cat Age Calculator
Convert your cat's age to human years accurately. Calculate cat age based on veterinary guidelines and discover your cat's life stage.
Love Calculator
Fun love compatibility calculator! Enter two names to calculate your love match percentage. Discover how compatible you are with your crush or partner.
Numerology Calculator
Calculate your numerology life path number and expression number. Discover your personality traits and life purpose through numerology.