All Tools

Calculate percentages, find what percent one number is of another, and more.

Calculate percentage increase or decrease between two values.

Calculate your weighted and unweighted GPA from each course’s credits and grade.

Calculate the perfect tip amount.

Calculate sale prices instantly.

Work out the square footage of a room or area, and the cost to cover it at a price per square foot.

Calculate monthly loan payments, total interest, and payoff schedule.

Calculate monthly mortgage payments including principal, interest, and taxes.

Calculate sales tax for US states and Canadian provinces. Add or remove tax from any amount.

Calculate your net pay after tax for 7 countries. Convert between annual salary and hourly rate.

Calculate your monthly car payment.

Calculate how your savings grow with compound interest.

Calculate your Body Mass Index (BMI) and understand your weight category.

Estimate your maximum heart rate and see your five training zones in bpm, using the percentage-of-HRmax or the Karvonen heart-rate-reserve method.

Turn a daily calorie target into grams of protein, carbohydrate and fat with a diet preset or a custom split.

Calculate your basal metabolic rate in kcal and kJ with the Mifflin-St Jeor, Harris-Benedict, Katch-McArdle and Schofield equations.

Calculate your daily calorie target from your goal and pace, with the projected change over time and a macro split.

Estimate your total daily energy expenditure, read the calories each activity level implies, and see the goal band around maintenance.

Calculate your exact age in years, months, and days from your birth date.

Calculate the exact number of days, weeks, months, and years between two dates.

Find out exactly how many days are left until any date.

Count the days between any two dates, past or future, with the inclusive or exclusive convention stated.

Calculate elapsed hours and minutes between two clock times, including overnight shifts.

Convert between units of length, weight, temperature, volume, speed, area, data, time, and transfer speeds.

Convert a whole number between decimal, binary, octal and hexadecimal — all four shown at once — and add or subtract two exact integers in any of them.

Calculate average speed from distance and elapsed time, with metric and imperial units.

Convert between 200+ currencies with live and historical exchange rates. Free, no registration required.

Learn the key differences between VAT and sales tax.

Understand fixed vs variable mortgage rates.

Learn the difference between APR and nominal interest rate.

Understand the difference between gross and net pay.

How EURIBOR affects mortgage payments.

Understanding the French usury rate for mortgages.