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Quick answers for the numbers that come up in everyday life: working out a percentage, checking a loan payment, finding your GPA or counting the days until a deadline.
Each calculator explains the formula it uses and shows the steps, so you can understand the answer rather than just copy it. Everything is calculated in your browser.
Ages, date ranges and time arithmetic.
Percentages, averages, ratios and fractions.
Grade point averages for school and university.
BMI, calories and running pace.
Loans, interest, pay, discounts and tips.
Yes. Every calculator is free to use with no account, no usage limits and no download.
The calculators use standard formulas and full floating-point precision, then round for display. Financial and health results are estimates based on the inputs and assumptions shown on each page, so confirm important decisions with your lender, school or doctor.
No. Calculations run in your browser and your inputs are not sent to our servers or saved.
Yes. Every calculator is designed for small screens first, with number keypads on mobile and results that update as you type.
Use the Percentage Calculator and choose the "% change" mode. Enter the starting and final values to see the increase or decrease and the working.
Text, image, developer and conversion utilities that run in your browser, so your data stays on your device.