Roof Pitch Gauge: Angle & x:12

Measure any roof's pitch in seconds. Set your phone on a rafter, ridge, or roof deck and Roof Pitch Gauge reads the slope straight from the built-in accelerometer — no string, no level, no math in your head.

The big live readout shows the same pitch four ways at once, so you can talk to anyone on the job:

• x:12 rise over run — the classic roofing pitch, like 4:12, 6:12 or 12:12.
• Degrees — the true angle of the slope.
• Percent grade — handy for low-slope and flat roofs.
• Rafter multiplier — the factor that turns your run into rafter length, so you can order and cut lumber right the first time.

WHAT YOU GET

• Instant accelerometer pitch — lay the phone flat against the surface and read it.
• Four readings together — x:12, degrees, percent, and rafter length factor side by side.
• Hold / freeze — capture a reading on the roof, then read it safely back on the ground.
• Calibrate to zero — null out your phone's case or a known-level surface for a true reading.
• Clean, high-contrast display — easy to read in bright sun or a dim attic.

WHO IT'S FOR

Roofers and roofing estimators, framers and builders, solar installers checking panel tilt, gutter and siding crews, home inspectors, and DIYers re-roofing the shed or sizing rafters for a deck cover.

HOW IT WORKS

Roof Pitch Gauge uses your device's motion sensor as an inclinometer. Rest the phone on the slope you want to measure and read the angle — or hold a reading to check it later.

A NOTE ON ACCURACY

Readings depend on your device's sensor and how flat the phone sits against the surface. Calibrate on a known-level reference first, and treat results as a field estimate, not a substitute for a certified instrument on safety-critical work.