About us

CalcHub is a free collection of 785 online calculators and converters across 34 categories — from loans, taxes and investments to health, cooking, engineering, dates and unit conversion. Every tool is quick, works on any phone or computer, and needs no sign-up.

What we believe

• Simple and fast. Type a few numbers and get clear results, often with several useful figures at once.
• Transparent. Each calculator page explains the formula it uses, so you can check the maths.
• Private. Your inputs are used to calculate your result. We don't sell personal data — see our Privacy policy.
• Free. The site is supported by optional advertising and is free to use.

How accurate are the results?

Calculators use standard, published formulas, and we test them carefully. Results are estimates for information and planning only. For medical, financial, tax, legal or engineering decisions, please check with a qualified professional — see the Terms of use.

For developers

Every calculator is also available through a free JSON API — see the Developer API.

Get in touch

Found a mistake or have an idea for a new calculator? We'd love to hear from you — suggestions help us decide what to build next.