Privacy policy

Last updated 2026-10-13.

Your inputs

The calculator runs in your browser. The numbers you type are not sent to or stored by this site, and there is no account or login.

Analytics

We use Google Analytics to measure aggregate page visits and clicks on affiliate links. Google Analytics may set cookies and processes data under Google's privacy policy.

Advertising

Pages on this site can show third-party advertising (Adsterra). Ad providers may set their own cookies and receive your IP address and browser details when an ad loads; their handling is governed by their own policies.

Affiliate links

Some pages include affiliate links (for example Amazon Associates, Coupang Partners and AliExpress search links). We may earn a commission from qualifying purchases at no extra cost to you. Links are marked rel="sponsored" and never change calculation results.

Your choices

You can block or delete cookies in your browser settings, and use browser or extension tools to block ads. The calculator keeps working without them.

Children

This site is not directed to children under 13 and does not knowingly collect personal information from them.