Roof Pitch & Estimator

Measure any roof's pitch in seconds, then estimate the materials to cover it. 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. ROOF ESTIMATOR Once you know the pitch, find out what it takes to cover the roof. Enter your building's footprint and overhang, pull in the pitch you just measured, and the estimator works out the true sloped area, the number of roofing squares, and how many shingle bundles to buy — with an adjustable waste allowance so you don't come up short. It also returns rafter length and run, in feet or metres, so you can order lumber and materials with confidence. 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. • Roof estimator — footprint + pitch to sloped area, roofing squares, shingle bundles with waste, and rafter length. • 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. 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 pitch readings and material estimates as a field guide, not a substitute for a certified instrument or a professional takeoff on safety-critical work. Free with ads. No account needed.