Roofing for 400 sq ft
10 percent waste, 3 bundles per square.
Squares
4.4
Bundles
14
squares = 400 ÷ 100 × 1.10 = 4.4
About 37 m² of roof.
Open the Roofing CalculatorAbout this estimate
One square is 100 square feet of roof surface, and shingles run about three bundles per square. Enter the sloped roof area, not the footprint, and add 10 percent for ridge, hip and starter courses.
On the roof? Knee pads make a long day on a pitched roof far less punishing.
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Common questions
How many shingle bundles for a 400 square foot roof?
That is 4 squares, or 4.4 with 10 percent waste, about 14 bundles at three per square.
Is roof area the same as floor area?
No. Roof area is the sloped surface, which is larger than the building footprint because of the pitch.
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