Privacy

StemCalc has no accounts, no sign-up and no database of users.

Calculations

Every calculator runs in your browser. The numbers and formulas you type are not sent anywhere.

What is saved on your device

To save you retyping, the site stores your last inputs for each calculator, the scientific calculator’s history (last 12 results) and your degree/radian choice in your browser’s local storage, under keys starting with stemcalc:. This never leaves your device.

Tutor questions

When you press “Explain it”, your question (and, on calculator pages, a one-line summary of the values you entered) is sent to our server and passed to an AI model via Vercel AI Gateway to write the answer. We don’t store questions or answers, and we keep a short-lived, in-memory count of requests per IP address only to prevent abuse.

Analytics

We use Ahrefs Web Analytics to count page views. It does not use cookies and does not build a profile of you.