Roofing Calculator per Square Metre
Enter the area in square metres (m²) for a quick roofing estimate.
Runs locally in your browser — your measurements never leave this pageTry: Roof length=30, Roof width=20, Pitch factor=1, Waste=10, Units=m → 6458.40 m², 1, 71.04, 214
How to use
Enter the roof footprint length and width and the pitch factor (steeper roofs have more surface). One square = 100 ft²; three bundles make a square. The calculator applies both the pitch and a 10% waste margin.
FAQ
What is a roofing square?
A square is 100 ft² of roof surface — the standard unit shingle bundles are sold by (3 bundles per square).
How do I find the pitch factor?
Measure how far the roof rises per 12 inches of run; ×1.0 is low, ×1.15 medium, ×1.3 steep. When unsure, use 1.15.
Does this include the starter and ridge?
No — add one extra bundle for starters and ridge caps beyond the field count.
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