Free Online Calculators

Fast, accurate, and easy-to-use calculators for everyday math. No sign-up required.

Finance Calculators

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Mortgage Calculator

Estimate your monthly mortgage payment, total cost, and total interest paid over the life of the loan.

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Compound Interest Calculator

See how your money grows over time with compound interest. Adjust rate, frequency, and duration.

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Percentage Calculator

Find percentages, calculate percent change, or determine what percentage one number is of another.

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Loan Amortization Calculator

See your complete loan repayment schedule โ€” monthly payment, principal vs. interest breakdown, and payoff timeline.

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Auto Loan Calculator

Calculate your monthly car payment. Factor in down payment, trade-in value, interest rate, and loan term.

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Credit Card Payoff Calculator

Find out how long it takes to pay off your credit card balance and how much interest you will pay in total.

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Tip Calculator

Quickly calculate the tip amount, total bill, and per-person split for any restaurant or service bill.

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Split Bill Calculator

Divide any bill evenly among a group. Optionally add a tip and see exactly what each person owes.

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Paycheck Calculator

Estimate your take-home pay after federal income tax, FICA, and state taxes for any pay period.

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Savings Goal Calculator

Find out how long it takes to reach a savings goal given your current balance, monthly contributions, and interest rate.

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Budget Calculator

Plan your monthly budget by entering your income and expense categories to see your remaining balance and savings rate.

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Debt-to-Income Calculator

Calculate your debt-to-income ratio and see how lenders evaluate your ability to manage monthly payments.

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Break-Even Calculator

Determine the break-even point for a product or business given fixed costs, variable costs, and selling price.

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Health & Fitness Calculators

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BMI Calculator

Calculate your Body Mass Index. Supports metric and imperial units with instant category feedback.

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BMR Calculator

Calculate your Basal Metabolic Rate โ€” the calories your body burns at rest โ€” using the Mifflin-St Jeor equation.

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TDEE Calculator

Find your Total Daily Energy Expenditure based on your BMR and activity level to set accurate calorie goals.

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Body Fat Calculator

Estimate your body fat percentage using the US Navy Method with height, waist, neck, and hip measurements.

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Ideal Body Weight Calculator

Find your ideal weight range using the Devine and Hamwi formulas based on height and sex.

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Calorie Deficit Calculator

Calculate your daily calorie deficit or surplus and see how fast you will lose or gain weight.

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Macro Calculator

Break down your daily calorie goal into protein, carbs, and fat grams based on your fitness objective.

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Water Intake Calculator

Find your recommended daily water intake in liters, ounces, and cups based on weight and activity level.

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One-Rep Max Calculator

Estimate your 1RM for any lift using the Epley and Brzycki formulas, plus a full percentage training table.

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Running Pace Calculator

Calculate your running pace per km and per mile from any distance and finish time.

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Waist-to-Hip Ratio Calculator

Measure your waist-to-hip ratio and see how it correlates to cardiovascular health risk by sex.

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Ovulation Calculator

Calculate your ovulation date and 6-day fertile window from your last period and cycle length.

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BAC Calculator

Estimate your blood alcohol content (BAC) using the Widmark formula โ€” and how long until you are sober.

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Calories Burned Calculator

Calculate calories burned during any exercise or activity based on MET values, weight, and duration.

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Pregnancy Weight Gain Calculator

See your recommended pregnancy weight gain range based on IOM guidelines and your pre-pregnancy BMI.

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Due Date from Conception

Calculate your estimated due date from your conception date and see your current gestational age.

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Date & Time Calculators

Unit Conversions Calculators

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Length Converter

Convert between millimetres, centimetres, metres, kilometres, inches, feet, yards, miles, and nautical miles.

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Weight Converter

Convert between milligrams, grams, kilograms, tonnes, ounces, pounds, stone, and US/UK tons.

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Temperature Converter

Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine instantly.

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Speed Converter

Convert between metres per second, kilometres per hour, miles per hour, knots, and feet per second.

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Cooking Measurements Converter

Convert cooking measurements between teaspoons, tablespoons, cups, fluid ounces, pints, quarts, gallons, and millilitres.

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Fuel Efficiency Converter

Convert fuel economy between MPG (US), MPG (UK), litres per 100 km, and kilometres per litre.

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Pressure Converter

Convert between Pascals, kilopascals, bar, PSI, atmospheres, mmHg, and inHg.

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Energy Converter

Convert between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTUs, and foot-pounds.

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Shoe Size Converter

Convert shoe sizes between US Men, US Women, UK, EU, and foot length in centimetres.

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Roman Numeral Converter

Convert any number (1โ€“3999) to Roman numerals, or convert a Roman numeral back to an integer.

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Home & Construction Calculators

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Square Footage Calculator

Calculate area in square feet, square meters, and square yards. Supports feet, meters, yards, inches, and centimeters.

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Paint Calculator

Calculate how many gallons of paint you need for a room based on wall area, coats, and coverage rate.

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Flooring Calculator

Calculate the square footage of flooring or tile needed for a room, including a waste factor for cuts.

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Concrete Calculator

Calculate cubic yards of concrete needed for a slab or cylindrical pour, plus the number of bags required.

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Fence Calculator

Estimate the posts, rails, and pickets needed for a fence based on total length and post spacing.

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Mulch & Soil Calculator

Calculate cubic yards of mulch, soil, or gravel needed for a garden bed based on area and desired depth.

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Roofing Calculator

Calculate roofing squares and shingle bundles needed based on roof footprint, pitch, and waste factor.

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Carpet Calculator

Calculate how many square yards of carpet you need for a room, with a waste percentage for seams and cuts.

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Deck Calculator

Estimate the number of deck boards and total linear feet of lumber needed for a rectangular deck.

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Moving Truck Size Calculator

Find the right rental truck size for your move based on the number of bedrooms and furniture load.

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Wallpaper Calculator

Calculate how many rolls of wallpaper you need for a room, accounting for doors, windows, and pattern repeat.

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Math & Science Calculators

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Area Calculator

Calculate the area of circles, rectangles, triangles, trapezoids, ellipses, and sectors.

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Volume Calculator

Calculate the volume of cubes, rectangular prisms, cylinders, spheres, cones, and pyramids.

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Perimeter Calculator

Calculate the perimeter or circumference of squares, rectangles, triangles, circles, and regular polygons.

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Pythagorean Theorem Calculator

Find any side of a right triangle given the other two using the Pythagorean theorem (aยฒ + bยฒ = cยฒ).

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Quadratic Formula Calculator

Solve any quadratic equation axยฒ + bx + c = 0. Returns real and complex roots with the discriminant.

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GCF & LCM Calculator

Find the Greatest Common Factor and Least Common Multiple of two numbers with step-by-step working.

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Standard Deviation Calculator

Calculate mean, standard deviation, variance, min, max, and range for any set of numbers.

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Probability Calculator

Calculate P(A and B), P(A or B), and conditional probabilities for independent and dependent events.

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Kinetic Energy Calculator

Calculate kinetic energy (KE = ยฝmvยฒ) in joules, kilojoules, and foot-pounds. Supports kg, lb, m/s, mph.

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Free Fall Calculator

Calculate free fall time, distance, and final velocity given height or time. Metric and imperial units.

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Percentage Change Calculator

Calculate the percentage increase or decrease between two values instantly.

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Ratio Calculator

Simplify ratios, solve for missing values, and compare proportions.

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Scientific Notation Converter

Convert numbers between standard form and scientific notation instantly.

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Fraction to Decimal Converter

Convert fractions to decimals, percentages, and simplified form instantly.

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Significant Figures Calculator

Round any number to a specified count of significant figures.

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Automotive Calculators

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Fuel Cost Calculator

Calculate total fuel cost for any trip. Supports MPG/imperial and L/100km/metric.

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Gas Mileage Calculator

Calculate MPG or L/100km from distance and fuel used.

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Road Trip Cost Calculator

Estimate total road trip cost including fuel, food, and lodging.

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Car Depreciation Calculator

See how your car loses value year by year with a depreciation schedule.

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EV Range & Charging Cost Calculator

Estimate electric vehicle range and charging cost from battery size and efficiency.

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Tire Size Calculator

Compare two tire sizes โ€” diameter, circumference, and speedometer error.

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Horsepower & Torque Calculator

Convert between horsepower, torque (ftยทlb / Nm), and RPM using HP = Torque ร— RPM / 5252.

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Oil Change Cost Calculator

Calculate annual and lifetime oil change costs based on mileage and service interval.

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Towing Capacity Calculator

Check if your vehicle can safely tow a trailer and calculate tongue weight.

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Car Lease vs Buy Calculator

Compare total lease cost vs buying โ€” monthly payments, equity, and net cost.

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EV vs. Gas Calculator

Compare the total 5-year cost of owning an EV vs. a gas vehicle including fuel, insurance, and maintenance.

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Advanced Finance Calculators

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Retirement Calculator

Project your 401k or retirement account balance with contributions, employer match, and compound growth.

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Roth vs Traditional IRA Calculator

Compare Roth vs Traditional IRA after-tax values based on current and expected future tax rates.

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Investment ROI Calculator

Calculate total return, percentage gain, and annualized (CAGR) return on any investment.

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Dividend Yield Calculator

Calculate dividend yield %, yield on cost, and annual/monthly/quarterly dividend income.

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Net Worth Calculator

Calculate your total net worth by entering assets and liabilities across all categories.

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Inflation Calculator

Calculate the future value of money or how much past amounts are worth in today's dollars.

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Rent vs Buy Calculator

Compare total cost of renting vs buying a home over any time period, including equity and appreciation.

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Emergency Fund Calculator

Calculate your recommended 3- and 6-month emergency fund target and how long to reach it.

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College Savings Calculator

Estimate total college costs and monthly savings needed to fund a 529 plan for your child.

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Tax Bracket Calculator

Estimate 2025 federal income tax by bracket. Shows effective rate, marginal rate, and after-tax income.

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Dollar Cost Averaging Calculator

See how regular fixed investments grow over time with dollar cost averaging. Model your DCA strategy.

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FIRE Number Calculator

Calculate your FIRE number โ€” the portfolio size needed to retire early based on the 4% safe withdrawal rule.

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Life Insurance Needs Calculator

Estimate how much life insurance coverage you need based on income, debts, dependents, and existing assets.

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Education & Life Calculators

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GPA Calculator

Calculate your weighted GPA using letter grades and credit hours for any number of courses.

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Grade Needed Calculator

Find out what grade you need on remaining assignments to hit your target course grade.

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Test Score Calculator

Convert a raw test score to a percentage and letter grade instantly.

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Freelance Rate Calculator

Calculate the minimum hourly freelance rate to hit your income goals after taxes and expenses.

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Hourly to Salary Calculator

Convert an hourly wage to annual salary, monthly, biweekly, and daily pay equivalents.

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Cost Per Use Calculator

Calculate cost per use of any item to determine its true value vs. a cheaper alternative.

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Wedding Budget Calculator

Break down your wedding budget by category โ€” venue, photography, catering, flowers, and more.

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Vacation Cost Calculator

Estimate total vacation costs including flights, hotel, food, and activities for any trip.

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Pregnancy Due Date Calculator

Calculate your estimated due date from your last menstrual period and see trimester milestones.

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Sleep Cycle Calculator

Find the best bedtime based on your wake time to align with natural 90-minute sleep cycles.

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Pet Cost Calculator

Estimate the first-year and ongoing annual cost of owning a dog or cat including food, vet care, and supplies.

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Carbon Footprint Calculator

Estimate your annual carbon footprint from home energy, driving, flights, and diet. See where you can reduce.

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Taxes Calculators

Business Calculators

Real Estate Calculators

Fun & Viral Calculators

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Dog Age Calculator

Convert your dog's age to human years using a size-adjusted formula โ€” not the old 7ร— myth.

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Cat Age Calculator

Convert your cat's age to human years and find out their life stage โ€” kitten to geriatric.

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Age on Other Planets

Find out how old you would be on Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune.

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Life in Numbers

See your life expressed in heartbeats, breaths, hours slept, steps walked, and more based on your age.

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How Rich Am I?

Compare your annual income to your country and the global population to see your wealth percentile rank.

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Smoking Cost Calculator

Calculate how much money and how many years of life you have spent โ€” or will spend โ€” on cigarettes.

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Coffee Cost Calculator

Calculate your lifetime coffee spend and daily caffeine intake from your daily coffee habit.

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Alcohol Calorie Calculator

Count the calories in your weekly drinks โ€” beer, wine, and spirits โ€” and see the annual total.

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Milestone Age Calculator

Find out when you will hit 1 million hours, days, minutes, or seconds old based on your birthday.

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Retirement Countdown

See exactly how many days, hours, and minutes remain until your target retirement age.

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Birthday Countdown

Count down the exact days, hours, and minutes until your next birthday and see how old you will be.

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Lottery Odds Calculator

See how unlikely it is to win the lottery compared to being struck by lightning or other rare events.

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Reading Time Calculator

Calculate how long it will take to read any book based on page count and your reading speed.

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Typing Speed Calculator

Find out how many pages, words, or books you could type in an hour, day, or year at your WPM.

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