Roof pitch and sheet calculator
Get rafter length, roof area and sheet count for a simple gable roof from the span and pitch.
Your measurements
How it's worked out
Rise = half span × tan(pitch). Rafter = (half span + overhang) ÷ cos(pitch). Sheets per side = (roof length + both overhangs) ÷ sheet cover width.
Estimates only. Check sizes, coverage and quantities with your supplier, engineer or certifier before ordering. Standards references are a guide, not compliance advice.
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