免费屋顶面积计算器
根据建筑占地面积和坡度计算屋顶表面积，使用坡度系数精确计算。
Roof Surface Area
1,677 sq ft
Roof Surface Area vs Building Length
公式
How to Calculate Roof Area
Formula
Roof Area = Footprint Area × Pitch Factor
Pitch Factor = sqrt(1 + (Rise/12)²)
This method converts the horizontal footprint into the actual surface area by accounting for the roof slope.
计算示例
A building 50 ft by 30 ft with a 6/12 roof pitch.
- 01Footprint area = 50 × 30 = 1,500 sq ft
- 02Pitch factor = sqrt(1 + (6/12)²) = sqrt(1.25) = 1.1180
- 03Roof area = 1,500 × 1.1180 = 1,677 sq ft
- 04Roofing squares = 1,677 / 100 = 16.8 squares
常见问题
Does this include overhangs?
No. This calculation is based on the building footprint. Add the overhang area separately. For example, a 1-foot overhang on all sides of a 50×30 building adds approximately 168 sq ft.
What about complex roof shapes?
For hip roofs, gable roofs, and simple shapes, the pitch factor method works well. For complex roofs with multiple pitches, valleys, and dormers, calculate each section separately and add them together.
How do I measure roof pitch from the ground?
Use a pitch gauge or speed square on a rafter, or measure from inside the attic. You can also estimate by holding a level at the roof edge and measuring the rise over 12 inches of run.
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