16OC does real feet-inch-fraction math plus right-angle & rafter solutions, stairs, area & volume, roofing, materials and trig.
It's a free Progressive Web App with no signup, no ads, and no subscription. Tap your browser's Share, then Add to Home Screen on iOS, or Install app on Android, to get an icon that launches full-screen and works offline.
The screen stays awake while the app is open, so it won't sleep between measurements.
v1.1 · 16oc.pages.dev
Scan to open the free 16OC calculator. Print it and tape it on the job trailer or toolbox so the whole crew can grab it.
16OC runs as an app on your home screen, full-screen and fully offline. It isn't available in the browser tab. Add it to your home screen to start.