Roofing calculators that show their working
Pitch, area, rafters, materials, cost and load — measured the way roofers and framers actually work, in imperial or metric, with every step of the math on screen.
Your measurements
Enter the values you know — results update live.
Vertical height the roof gains. Measure from the top of the wall plate to the underside of the ridge.
Horizontal distance the rise happens over. For an X:12 pitch, use 12.
Common pitches
Analysis
Live results from your measurements.
Walkable with care. Most crews still use roof jacks and a harness.
Show the working
- Slope ratio:
6 ÷ 12= 0.5 - Pitch as X:12:
0.5 × 12= 6:12 - Angle:
arctan(0.5)= 26.57° - Slope percentage:
0.5 × 100= 50% - Pitch multiplier:
√(6² + 12²) ÷ 12= 1.118
Popular roof pitches
Full pitch chartMeasure with your phone
Lay your phone on a rafter and the pitch finder reads the angle — no app store download needed.
Works offline, installs like an app
Add it to your home screen and the calculators keep working on site without signal.
Share the exact result
Every calculation lives in the link, so a roofer, supplier or client sees the same numbers.
Pitch & Slope
Area & Measurement
Framing & Structure
Materials & Quantities
Cost & Estimating
Load, Drainage & Performance
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Roofing guides
All guides
How to Calculate Roof Pitch: 6 Methods That Actually Work
Roof Pitch in Degrees: 5° to 45° Roofs Converted to X/12
Roof Pitch for Sheds, Porches, Pergolas, Garages and Other Projects
Minimum Roof Pitch by Material: IRC Limits for Every Covering
Roof Pitch Multiplier: Chart, Formula and How to Use It
How to Measure a Roof: Attic, Ground and Satellite Methods