Roofing for 100 m²
10 percent waste, 3 bundles per square.
Squares
11.8
Bundles
36
squares = 100 ÷ 9.29 × 1.10 = 11.8
About 1076 sq ft of roof.
Open the Roofing CalculatorAbout this estimate
One roofing square is about 9.29 square metres, and shingles run three bundles per square. Use the sloped roof area and add 10 percent for waste.
On the roof? Knee pads make a long day on a pitched roof easier.
View on AmazonAs an Amazon Associate we earn from qualifying purchases.
Common questions
How many bundles for a 100 square metre roof?
About 11.8 squares with waste, roughly 36 bundles, since one square is about 9.29 square metres.
Do I use the sloped area?
Yes. Measure the actual sloped roof planes, which are larger than the building footprint.
More Calculators
Concrete New
Enter slab dimensions. Result rounds up with a 7 percent waste allowance.
Gravel New
Enter the area dimensions and depth. Result rounds up with a 5 percent waste allowance.
Mulch New
Enter the bed area and depth. Result rounds up with a 5 percent allowance.
Topsoil New
Enter the area and depth. Result rounds up with a 5 percent allowance.
Paint New
Enter total wall area and coats. Result rounds up to whole units.
Flooring New
Enter room area and the coverage printed on the box. 10 percent waste added.
Tile New
Enter the area and one tile size. 10 percent waste added.
Drywall New
Enter total area to cover. 10 percent waste added.
Paver New
Enter the patio size and one paver size. 5 percent waste added.
Sand New
Enter the area and depth. 5 percent allowance added.
Roofing New
Enter the roof surface area. 10 percent waste added. Three bundles per square.
Insulation New
Enter area to cover and the coverage printed on the package. 5 percent added.
Fence New
Enter total fence length and post spacing.
Sod New
Enter the area to cover. 5 percent allowance added.
Grass Seed New
Enter area and seeding rate. Default rates suit a new lawn.
Fertilizer New
Enter area, target nitrogen rate and the first number on the bag.
Cubic Yards New
Enter length, width and depth. No waste added.
Square Footage New
Enter length and width.
Board Foot New
Enter board dimensions and quantity.
Material Cost New
Enter quantity, unit price, tax and delivery. Figures are in your own currency.