About Calcooly

Calcooly started with a simple frustration: needing a quick answer — a loan payment, a BMI, a percentage — and landing on slow, cluttered pages buried under pop-ups. We wanted the opposite.

Today Calcooly offers 30 calculators across money, health, math, dates and everyday life. Every one is built around the same principles:

• Instant.Answers appear as you type — no "calculate" button, no page reloads.
• Private. Every calculation runs in your browser. The numbers you enter never leave your device.
• Free. No accounts, no paywalls, no trials. Ads keep the lights on so the tools stay free for everyone.
• Clear. A clean, honest design that respects your time and your screen.

How we keep it free

Calcooly is supported by advertising. Ads let us build and maintain the tools without charging you or hiding features behind a subscription. See our Privacy Policy for how advertising and data work.

A note on accuracy

Our calculators are built carefully and tested, but they provide estimates for general information only. They are not a substitute for professional financial, medical or legal advice. Always consult a qualified professional for important decisions.

Have an idea for a calculator we're missing? We'd love to hear it — reach us on the contact page.