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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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Calculation Results
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.

작동 방식

1

모양 선택

Choose the shape that matches your space.

2

치수 입력

모든 단위로 측정값을 입력합니다. 수량, 낭비 요소 및 재료 가격을 추가합니다.

3

결과 얻기

면적을 ft², in², yd², m², 에이커 및 예상 비용 단위로 한 번에 확인하세요.

자주 묻는 질문

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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