Calculator Tools
Everyday and specialized calculators.
Calculator Tools list
BMI Calculator
Calculate your Body Mass Index in metric or imperial units.
Age Calculator
Work out an exact age in years, months and days from a birth date.
Percentage Calculator
Find a percentage of a number, a ratio as a percent, or a percent change.
Discount Calculator
Find the sale price and amount saved from a price and discount percent.
VAT Calculator
Add or remove VAT and see the net, VAT and gross amounts.
Date Difference Calculator
Count the time between two dates in years, months, days and more.
Time Calculator
Add or subtract durations in hours, minutes and seconds.
GPA Calculator
Calculate a weighted grade point average from courses and credits.
Loan Calculator
Estimate the monthly payment, total interest and cost of a loan.
Mortgage Calculator
Estimate a monthly mortgage payment from price, down payment, rate and term.
About Calculator Tools
Calculators handle the everyday math you would otherwise do by hand or in a spreadsheet — body mass index, percentages, loan payments and more. Each one explains its formula so you can trust and learn from the result.
Calculations run instantly in your browser as you type, with no rounding surprises hidden behind a server. The accompanying content explains what the numbers mean and how to interpret them.
Explore related calculators through the internal links to cover a whole topic — health, finance, or unit conversion — in one place.
Frequently asked questions
- Are these calculators accurate?
- Each calculator uses the standard published formula for its domain and shows that formula on the page so you can verify the result.