Free online calculators

Quick, accurate calculators for money, health, dates, and everyday math. Each one works instantly in your browser — no sign-up required.

11 tools · free · no sign-up

Work out percentages, ratios, and percentage change.

Calculate the tip and split a bill between people.

Find the sale price and how much you save.

Add or remove GST, VAT, or sales tax from a price.

Estimate monthly loan payments, interest, and total cost.

Calculate your Body Mass Index in metric or imperial.

Estimate daily calories from BMR and activity.

Calculate your GPA on a 4.0 scale.

Resize dimensions while keeping the same ratio.

Calculate exact age in years, months, and days.

Count the days, weeks, and months between two dates.

Frequently asked questions

Are these calculators free?

Yes — every calculator is completely free to use, with no account and no limits.

Do they work on mobile?

Yes — all calculators are responsive and work on phones, tablets, and desktops.