Tool guides

Free online calculators

Everyday calculators for numbers, dates and health — fast results in your browser, no install.

Frequently asked questions

Do calculators require an account?

No. Everyday calculators on Tentaco work without sign-up.

Are results stored on a server?

Local calculator modes keep inputs in your browser tab. Nothing is saved to Tentaco unless a mode explicitly says otherwise.

Where are loan calculators?

Open the finance tools hub for loans, fees and money maths alongside this general calculator index.