Privacy

We do not ask for your name, email address or account. We do not collect sensitive personal information, and we do not know what you sold, what you paid for it, or that you used the calculator at all.

Every calculation runs in your browser. Item prices, costs and margins you enter are never transmitted to our servers.

The site may keep your most recent inputs in your browser's local storage so a page feels continuous when you return to it. That data stays on your device and can be cleared at any time by clearing your browser data.

We use privacy-friendly aggregate analytics to understand which calculators and pages are useful. We measure page views and interface events such as "a calculation was run" — not the values entered. We do not build individual profiles.

Some pages may carry advertising. Where ads are shown, the advertising network may set its own cookies subject to its own policies. We do not pass your calculator inputs to advertisers, because we never receive them.

If this policy changes, the update will appear on this page. The principle will not change: what you enter stays with you.