Calculators
From dates to percentages, these calculators give you a straight answer with the working shown, so you can trust the number.
Age Calculator
Calculate exact age in years, months, and days from any birth date, plus your next birthday countdown.
Percentage Calculator
Calculate what percentage one number is of another, apply a percentage increase or decrease, and more.
BMI Calculator
Calculate Body Mass Index from height and weight, in either metric or imperial units, with a clear category result.
Tip Calculator
Calculate the tip on a bill, see the total, and split it evenly between any number of people.
Unit Converter
Convert between common length, weight, and temperature units instantly, with precise results.
Currency Converter
Convert between major currencies using a live exchange rate sourced from the European Central Bank.
Loan Calculator
Estimate the monthly payment, total interest, and total cost of a fixed-rate loan.
Discount Calculator
Calculate the final price after one or more percentage discounts, applied one after another.
Compound Interest Calculator
Project how an investment grows over time with compound interest and optional regular contributions.
Pet Age Calculator
Convert your dog's or cat's age into human years using a non-linear veterinary approximation, not the old 'times 7' rule.
GPA Calculator
Calculate a weighted GPA on a 4.0 scale from your courses, grades, and credit hours.
Body Fat Calculator
Estimate body fat percentage from height and circumference measurements using the U.S. Navy method.
Pregnancy Due Date Calculator
Estimate a pregnancy due date, current week, and trimester from the first day of the last period.
Take-Home Pay Estimator
Estimate net take-home pay from gross salary using a flat tax rate you provide.
Date Calculator
Calculate the number of days between two dates, or add or subtract days from a date.
Calorie Calculator
Estimate your daily calorie needs (BMR and TDEE) based on age, height, weight, and activity level.
Sleep Cycle Calculator
Find the best bedtime or wake-up time based on 90-minute sleep cycles.
Final Grade Calculator
Calculate the score you need on a final exam to reach your desired overall grade.
Time Zone Converter
Convert a specific date and time from one time zone into several others at once.
Cooking Measurement Converter
Convert between cooking measurements like cups, tablespoons, and teaspoons, plus approximate ingredient weights in grams.
Grade Converter
Convert a percentage score into a letter grade and its GPA point equivalent.