Roof Pitch Calculator: Roofing

Lay your phone on the roof and read the pitch — rise:12, degrees and grade %, all three at once, on a dial you can read through work gloves.

Then finish the job in the same app: true roof area from the pitch, shingle bundles and underlayment, rafter lengths to the nearest 1/16", and a clean PDF estimate with your business name on it.

Free forever. No subscription. No sign-up. No account. No camera, no location — the app asks for zero Android permissions and works completely offline.


WHAT IT ANSWERS

• What is the pitch of my roof — in rise:12, degrees and percent?
• How many squares is my roof, and how many shingle bundles do I need?
• How long is my rafter — common, hip or valley?
• Where do I cut — plumb cut, level cut, birdsmouth?
• How much underlayment, ridge cap, drip edge and nails for the job?
• What does the estimate look like on paper, for my customer?


PITCH GAUGE

• Rest the phone on the roof, a rafter or a gable end — the dial reads the pitch from the tilt sensor
• Pitch (rise:12), angle (degrees) and grade (%) shown together — no switching views to get degrees
• A big, glove-friendly FREEZE button holds the reading while you climb down
• Snaps to common pitches (4/12, 6/12, 8/12 …) so a true 6/12 reads exactly 6/12
• Calibrate on a known-flat surface for a true zero
• Works as a roof pitch finder and angle finder for any slope — stairs, ramps, grading
• Manual mode: type rise and run on any phone, even without a tilt sensor


ROOF AREA — TRUE AREA, NOT FOOTPRINT

• Add each roof section with its own footprint and pitch
• The pitch multiplier turns flat footprint into true sloped roof area
• Results in sq ft and roofing squares — or m² in metric


SHINGLE AND MATERIALS CALCULATOR

• Shingle bundles, underlayment rolls and nails from your roof area
• Ridge cap, drip edge and starter strip from your ridge, eave and rake lengths
• Waste presets for simple gable, hip and complex roofs — or set your own percent
• Optional price per bundle for a quick cost figure


RAFTER CALCULATOR

• Common rafters and hip/valley rafters (the 17-inch factor), with overhang
• Rafter length to the nearest 1/16", plumb and level cut angles, rise per foot of run
• Checked against standard framing-square rafter tables


FEET-INCH-FRACTION KEYPAD

Type measurements the way you say them on site: 12' 6 3/4". A purpose-built keypad with fraction keys — no fighting the phone keyboard. Full metric mode too: meters and centimeters, degrees first.


PROJECTS AND FREE PDF ESTIMATES

Save any reading — a pitch, a roof area, a materials list, a rafter — into a project folder. Generate a clean PDF estimate with your business name and a sequential estimate number, then share it. Unlimited estimates, free, no watermark.


YOUR MEASUREMENTS STAY ON YOUR PHONE

Measurements, projects and estimates are stored only on your device — never uploaded, never sold. The app requests zero Android permissions. It is free and supported by small banner ads; the gauge screen itself never shows one, so nothing gets between you and the reading.


WHO IT IS FOR

Roofers and roofing estimators. Framers cutting rafters. Inspectors and adjusters who need the pitch from the ladder, once, without an account. Homeowners checking a contractor's shingle math before signing.


DISCLAIMER

Material quantities and costs are estimates for planning purposes only — actual needs vary with the roof, the product and local codes. Always verify quantities with your supplier and check measurements on site before ordering or cutting.