Free calculators, made simple
Clear answers for everyday numbers. Every calculator explains how the result is worked out, so you can check it yourself.
Popular calculators
Compound Interest Calculator
See how your savings grow with compound interest and monthly contributions.Loan Calculator
Work out the monthly payment, total interest, and amortization schedule of a loan.Age Calculator
Find your exact age in years, months, and days, plus your next birthday.Inflation Calculator
See how much things will cost in the future and how much your money will be worth.Fraction Calculator
Add, subtract, multiply, and divide fractions, with the result simplified.Percentage Change Calculator
Find the percentage increase or decrease between two values, or apply a percentage.One Rep Max Calculator
Estimate your one-rep max from any set and get training loads by percentage.Hours Worked Calculator (Time Card)
A free time card: add up your weekly hours from start and end times, with breaks and pay.Hourly to Salary Calculator
Convert pay between hourly, daily, weekly, monthly, and annual amounts.Overtime Calculator
Work out your overtime and total pay, including time and a half and double time.Margin Calculator
Find your profit margin from cost and price, or the price you need for a target margin.Markup Calculator
Set a selling price from your cost and markup, or find the markup from cost and price.ROI Calculator
Measure the return on an investment, in total and per year.Discount Calculator
Find the sale price and how much you save, including an extra discount.Debt Snowball Calculator
Plan how to pay off several debts and see when you will be debt-free.VAT Calculator
Add VAT to a price or remove it, with any VAT rate.Days Between Dates Calculator
Count the days, weekdays, and weeks between two dates.Time Calculator
Add and subtract hours and minutes, and see the total in decimal hours.Sleep Calculator
Find the best time to go to bed or wake up, based on 90-minute sleep cycles.Percentage Calculator
Work out a percentage of a number, what percent one number is of another, and more.Ratio Calculator
Simplify a ratio or split an amount in a given ratio.Rule of Three Calculator
Solve direct and inverse proportions: if A goes with B, what goes with C?Average Calculator
Find the mean, median, mode, and range of a list of numbers.Running Pace Calculator
Find your running pace or finish time for any distance, in kilometers or miles.Paint Calculator
Work out how much paint you need for the walls and ceiling of a room.Fuel Cost & Gas Cost Calculator
Estimate the fuel cost of a trip from the distance, fuel economy, and price.Cups to Grams Converter
Convert cups to grams and back for flour, sugar, butter, and other ingredients.Dog Age Calculator
Convert your dog's age to human years based on its size.Cat Age Calculator
Convert your cat's age to human years and see its life stage.Auto Loan & Car Payment Calculator
Estimate your monthly car payment with down payment, trade-in, sales tax, and fees.Sales Tax Calculator
Add state and local sales tax to a price, or find the price before tax.Savings Calculator
Find out how much to save each month to reach a goal, or how long it will take.APY Calculator
Convert an interest rate to the annual percentage yield for any compounding.Credit Card Payoff Calculator
See how long it takes to pay off a credit card, or how much to pay each month.Net Worth Calculator
Add up what you own and what you owe to find your net worth.Simple Interest Calculator
Work out simple interest for any principal, rate, and time.Rent Affordability Calculator
Find out how much rent you can afford with the 30% rule or the 40× rule.Retirement Calculator
Estimate your savings at retirement and the income they could give you.CPM Calculator
Work out the CPM, cost, or impressions of an ad campaign.GCF Calculator
Find the greatest common factor of two or more numbers, with prime factors.LCM Calculator
Find the least common multiple of two or more numbers, with prime factors.Standard Deviation Calculator
Get the sample or population standard deviation, variance, and mean of a list.Decimal to Fraction Calculator
Convert any decimal, including repeating decimals, to a simplified fraction.Slope Calculator
Find the slope, y-intercept, and equation of the line through two points.Volume Calculator
Find the volume of a box, cylinder, sphere, cone, or pyramid, in liters too.Pythagorean Theorem Calculator
Find the hypotenuse or a missing leg of a right triangle.Quadratic Formula Calculator
Solve ax² + bx + c = 0 for real or complex roots, with the discriminant.Area of a Circle Calculator
Find the area of a circle from its radius, diameter, or circumference.Scientific Notation Calculator
Convert numbers to and from scientific, E, and engineering notation.Probability Calculator
Find the chance of two independent events, or of something happening at least once.Military Time Converter
Convert military and 24-hour time to 12-hour AM/PM time and back.Square Footage Calculator
Find the area of a room or lot in square feet and square meters, with cost.Gravel Calculator
Find how many tons and cubic yards of gravel you need for a driveway or path.Mulch Calculator
Find how many cubic yards or bags of mulch you need for your garden beds.Stair Calculator
Find the number of steps, riser height, total run, and stringer length.Cubic Yard Calculator
Find how many cubic yards of concrete, dirt, or fill you need, with cost.Cubic Feet Calculator
Find the volume of a box, room, or load in cubic feet from any units.Board Foot Calculator
Find the board feet of lumber and its cost from the board sizes.Roofing Calculator
Estimate roof area, roofing squares, and shingle bundles from the house size.Roof Pitch Calculator
Convert roof pitch between x/12, degrees, and percent, or find it from rise and run.Pool Volume Calculator
Find how many gallons or liters of water your pool holds.Soil Calculator
Find how much soil you need for raised beds, in cubic yards and bags.Drywall Calculator
Find how many drywall sheets you need for a room, minus doors and windows.Voltage Drop Calculator
Estimate the voltage drop in copper or aluminum wire by size, length, and current.Ohm's Law Calculator
Enter any two of voltage, current, resistance, and power to find the others.Tire Size Calculator
Compare two tire sizes and see the diameter difference and speedometer error.Gas Mileage Calculator
Find your car's real MPG from miles driven and gallons used, in km/L too.GPA Calculator
Calculate your GPA on a 4.0 scale from letter grades and credits.Steps to Miles Calculator
Convert your step count to miles and kilometers using your height or step length.BMR Calculator
Estimate your basal metabolic rate with the Mifflin-St Jeor equation.TDEE Calculator
Estimate the calories you burn per day from your BMR and activity level.Calorie Calculator
Estimate the calories a day to keep, lose, or gain weight gradually.Calorie Deficit Calculator
See your daily calories with a moderate deficit and the approximate weekly change.Macro Calculator
Split your daily calories into grams of protein, carbs, and fat.Protein Calculator
Estimate how many grams of protein you need per day for your weight and activity.BMI Calculator
Find your body mass index and WHO category, with its limitations explained.Body Fat Calculator
Estimate your body fat percentage with the U.S. Navy tape-measure method.Ovulation Calculator
Estimate your ovulation window from your last period. Not a method of birth control.Pregnancy Weeks Calculator
Find how many weeks pregnant you are and your estimated due date.Speed, Distance and Time Calculator
Find speed, distance, or travel time from the other two, in miles or kilometers.Car Depreciation Calculator
Estimate how much value your car has lost and what it is worth after a few years.Horsepower Calculator
Find horsepower from torque and rpm, or convert between hp, kW, and PS.0 to 60 Calculator
Estimate your car’s 0 to 60 mph time from its weight and horsepower.EV Charging Cost Calculator
Find the cost to charge your electric car at home or at a public charger.Puppy Weight Calculator
Estimate how much your puppy will weigh as an adult, with a likely range.Dog Food Calculator
Find how many cups or grams of food your dog needs each day.Dog Calorie Calculator
Estimate how many calories your dog needs each day by weight and life stage.Dog Pregnancy Calculator
Estimate your dog’s due date and the likely window from the mating date.Cat Food Calculator
Find how much dry or wet food your cat needs each day.Typing Speed Test
Type a short text and see your words per minute and your accuracy.Final Grade Calculator
Find the score you need on the final exam to get the course grade you want.Grade Calculator
Add up your points to get your class grade and letter grade.Weighted Grade Calculator
Find your weighted average from each grade and its weight.Test Score Calculator
Turn your correct answers into a percentage, a score out of 10 or 20, and a letter grade.Solar Panel Calculator
Estimate how many solar panels you need from your electricity use and sun hours.BTU Calculator for Air Conditioners
Find the BTU per hour of cooling your room needs, and the AC size to buy.Wallpaper Calculator
Find how many rolls of wallpaper you need for a room.Sod Calculator
Find how many pieces or rolls of sod you need for your lawn.Flooring Calculator
Find how many boxes of flooring you need for a room, with extra for waste.Time Zone Converter
Convert a time between time zones and cities, with daylight saving time handled.Countdown Calculator
See the days, hours, minutes, and seconds left until any date, live.Business Days Calculator
Add or subtract working days from a date, skipping weekends (holidays not removed).Birthday Calculator
Days until your next birthday, the weekday you were born, and life milestones.Julian Date Calculator
Convert a date to its Julian day of the year and to the astronomical Julian Date (JD).
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