Slide Rule Watch Guide

Slide Rule Watch Guide is an offline educational tool that demonstrates how a circular logarithmic slide-rule bezel, the kind found on classic pilot chronograph watches, performs everyday calculations: multiplication, division, unit conversion (statute miles, nautical miles, kilometres), and speed / time / distance.

Rotate the outer bezel, type into the live input fields or tap an example button; the bezels demonstrate the alignment and the live equations panel explains the results.

The app is fully offline. It collects no personal data, has no network code, no analytics, no third-party SDKs, and no account system.

This app is an independent educational tool. It is not affiliated with, endorsed by, sponsored by, or in any way officially connected to any watch manufacturer or any brand.