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Services

Everything on CalcHub is free. Here is what we provide today:

1. The calculator library

A growing library of online calculators across finance, math, health & fitness, unit conversions, construction, science and everyday life. No account, no paywall, no result hidden behind a sign-up.

2. Worked examples and guides

Every calculator includes its formula and a worked example, and our guides explain the concepts behind the most-used tools in plain language.

3. Country hubs

Country hubs for the US, UK, Canada, Australia and India explain local currencies, units and conventions so the universal math lands correctly where you live.

4. Error reporting and calculator requests

If a formula can be checked, it can be challenged. Use the contact form to report a suspected error (include the calculator name and your inputs) or to request a calculator we have not built yet. Verified errors are corrected and the test suite is updated so the error cannot come back.

5. Paid custom work

Need something built just for you? For a fee we build custom calculators and custom web calculation tools — for example a pricing, loan or materials tool matched to your own formulas, units and branding — as well as data and research tasks. Send the details and the agreed amount through Pay for a service. Payment is by direct crypto payment (BTC, ETH, or USDC on Base) — wallet-to-wallet to the site owner, with no middleman — via that page, and we start work once your payment status shows Completed.