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Age Calculator
Find your exact age in years, months and days, plus total days lived and a countdown to your next birthday.
Calculators
Percentages, dates, finance, health and everyday math — with the formula behind every answer.
Average Calculator
Find the mean, median, mode, sum and range of a list of numbers.
BMI Calculator
Calculate body mass index from weight and height in metric or imperial units, with the WHO category.
Compound Interest Calculator
See how savings grow with compound interest and optional monthly deposits, year by year.
Date Difference Calculator
Count the days, weeks, months and business days between two dates.
Discount Calculator
Find the sale price and how much you save from a percentage discount, including stacked extra discounts.
Fraction Calculator
Add, subtract, multiply and divide fractions, with the answer simplified and shown as a mixed number and decimal.
GPA Calculator
Calculate a credit-weighted grade point average on the 4.0 scale from letter grades.
Loan Calculator
Calculate the monthly payment, total interest and yearly amortization schedule for a fixed-rate loan.
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Percentage Calculator
Find a percentage of a number, what percent one number is of another, or the percentage change between two values.
Ratio Calculator
Solve a proportion for the missing value, or simplify a ratio to its lowest terms.
Sales Tax Calculator
Add sales tax or VAT to a price, or work out the price before tax from a total that already includes it.
Simple Interest Calculator
Calculate simple interest and the total amount from a principal, an annual rate and a time in years, months or days.
Time Calculator
Add or subtract hours, minutes and seconds, and convert the result to total hours, minutes or seconds.
Tip Calculator
Work out the tip and total for a bill, and split it evenly between any number of people.