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Roof Square Footage Calculator

Roof Square Footage Calculator: To measure the square footage of a roof, multiply the building's footprint area by a slope factor for the

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Fator de desperdício de materiaisOPCIONAL

Estimar o custo do materialOPCIONAL

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1 ft (12 in) 1 ft 1 ft² = 144 in²

Roof Area Calculator

Calculate measured roof-section area. For slopes, measure the surface or apply a separate pitch calculation before ordering materials.

For related work, see sloped surface areas, gable end sections, hip roof faces, vertical wall cladding.

Como funciona

1

Selecione a forma

Choose the shape that matches your space.

2

Insira as dimensões

Insira medições em qualquer unidade. Adicione quantidade, fator de desperdício e preço do material.

3

Obtenha resultados

Visualize a área em pés², pol², jardas², m², acres mais estimativa de custo – tudo de uma vez.

Perguntas frequentes

Measure the footprint length and width of each roof section, multiply them for the footprint area, then multiply by the slope factor for the roof's pitch. Add the sections together.
A roofing square equals 100 square feet of roof surface. Roofers use squares to order shingles and estimate labor.
A 2,000-square-foot roof surface is 20 squares, because one square equals 100 square feet (2,000 ÷ 100 = 20).
25 squares means 2,500 square feet of roof surface (25 × 100). It is the amount of roofing needed to cover that area.
Yes. A sloped roof covers more area than the ground beneath it. Multiply the footprint by a slope factor, such as 1.118 for a 6/12 pitch, to find the roof area.
Three bundles of standard asphalt shingles cover one roofing square (100 square feet). Heavier shingles may need four or five bundles per square.
Use 10% for simple gable roofs. Use 15% for hip roofs, dormers, or valleys. Use 15 to 20% for complex roofs with skylights and penetrations.
Ceiling area is flat: room length × width below. Roof area includes slope, so it is larger. A vaulted ceiling can match the roof plane for that section.
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