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
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How these tools work
1
Nothing to install
Everything runs in your phone or computer browser — no software, no app.
2
No file uploads
Processing happens on your own device. Nothing is sent to servers.
3
Free and unlimited
No sign-up, no watermark, no “3 uses per day”. Use it as much as you need.