// multi-utility computation suite · offline · instant · precise
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tool.roofing-shingle-count Calculator
Calculates the number of shingle squares (100 sq ft each) needed for a roof from plan dimensions and pitch factor, plus ridge cap and starter strip quantities. Roof area is always larger than plan area due to pitch — a 6:12 pitch adds 12% to the horizontal footprint area.
Inputs
Roof Area Sqft
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Slope Rise
Reference formula or conversion factor shown for context.
Shingles Per Square
Reference formula or conversion factor shown for context.
Waste Pct
A multiplier applied in the calculation.
Results
bundles needed
Sample size or count used in the calculation.
slope-adjusted area (sq ft)
The gradient -- rise divided by run. In finance, rate of change per unit time.
squares
Reference formula or conversion factor shown for context.
slope factor
A dimensionless multiplier applied in the calculation.
waste factor
A dimensionless multiplier applied in the calculation.
hip/ridge extra
Reference formula or conversion factor shown for context.