Roof Pitch Calculator
Calculate pitch ratio, angle in degrees, slope percentage, and rafter length.
The roof pitch calculator converts between rise/run, angle, and slope percentage so you can communicate pitch in any format a supplier or sub expects. Enter what you know and the tool derives the other two representations instantly. It also calculates rafter length from the building span.
- A 4:12 pitch is the minimum for most asphalt shingle installations — check manufacturer specs before bidding low-slope roofs.
- Walking safety changes significantly above 6:12 — factor in harness and anchor costs for steep-slope work.
- Provide pitch as both ratio and degrees on takeoffs — some suppliers and subs use one, others use the other.
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