Roof Pitch: Slope & Angle

Lay your phone on the roof and read the pitch instantly.

Roof Pitch turns your phone into a pitch gauge. Rest it flat on a roof surface or a rafter and you get the rise/run reading roofers actually use - 4/12, 6/12, 8/12 - along with the angle in degrees and the pitch factor for material estimates.

MEASURE IN SECONDS
No account. No permissions. No setup screens. Open the app, lay the phone down, read the number.

WHAT YOU GET
- Pitch in rise/run (standard US roofing notation)
- Angle in degrees
- Pitch factor - multiply your footprint by this to get roof area
- Slope percentage
- A live roof diagram that matches the angle you are measuring

HOLD THE READING
You often cannot see the screen while the phone is against the roof. Tap Hold to freeze the value, then climb down and read it comfortably.

AREA CALCULATOR
Enter your base area and the app applies the pitch factor to give you the roof area. Switch between square feet and square meters.

PITCH REFERENCE TABLE
Angles, factors, and slope percentages for 2/12 through 12/12, available offline whenever you need to look one up.

CALIBRATION
Phone cases and camera bumps introduce a small tilt error. Place the phone on a flat surface and tap Set Zero once - readings stay accurate after that.

WHO IT IS FOR
Roofers, solar installers, insurance adjusters, carpenters, and homeowners who want to know their roof pitch before ordering materials or hiring help.

HOW IT WORKS
The app reads your phone's built-in accelerometer to determine tilt, then converts that angle into rise over a 12-inch run. The pitch factor comes from the same angle, so your area estimate always matches the pitch shown.

A NOTE ON ACCURACY
Readings depend on your phone's sensor and on the phone sitting flat against the surface. Calibrate on a level surface first, hold the phone steady, and take a second reading to confirm. This app is a measuring aid, not a substitute for professional inspection.

Works offline. No account required.