Free & Instant
Roofing Calculator
Work out roof area, squares, and shingle bundles needed based on your roof's footprint and pitch.
Roofing Calculator
Enter your building footprint to estimate roofing materials.
Roofing Materials Required
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Roof Area (m²)
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Squares
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Bundles
How Roofing Materials Are Calculated
Roof area is always larger than the building's footprint because the slope adds surface area — the steeper the pitch, the more material it takes to cover the same floor plan. The calculator applies a pitch multiplier to your footprint, adds a wastage allowance for hips, valleys, and cuts, then converts the total into roofing squares and shingle bundles.
Formula Used
Footprint (m²) = Length × Width
Roof Area = Footprint × Pitch Multiplier × (1 + Wastage %)
Squares = Roof Area ÷ 9.29 · Bundles = Squares × 3
Frequently Asked Questions
What is a roofing "square"?+
A square is the standard roofing unit, equal to 100 square feet or roughly 9.29 m². Suppliers and installers price and order materials by the square.
How many bundles come in a square?+
Most asphalt shingle products use 3 bundles per square, though some heavier or architectural shingles use 4 — check the packaging for your specific product.