Calculators

Free everyday calculators: percentage, BMI, rule of three, compound interest and loan payments — everything computed on your device, with nothing sent anywhere.

Percentage calculator

Discounts, increases and change — the everyday calculator

BMI calculator

Your body mass index and the healthy weight range

Rule of three calculator

Find the fourth value of a proportion — direct or inverse

Compound interest calculator

Simulate investments and debts with monthly deposits

Loan calculator

Payment, total interest and the full amortization schedule

How these tools work

Nothing to install

Everything runs in your phone or computer browser — no software, no app.

No file uploads

Processing happens on your own device. Nothing is sent to servers.

Free and unlimited

No sign-up, no watermark, no “3 uses per day”. Use it as much as you need.