Estimate roof area and the number of roofing squares needed for shingles or metal panels. for planning material orders before final site measurements.
Planning calculator only. Do not rely on this page alone for structural design, permitting, code compliance, engineering signoff, procurement quantities, or contractual commitments.
Roof area = length × width × pitch factor. One roofing square = 100 sq ft.
Enter job values, review the estimate, then use the decision hints before ordering or quoting.
| length | width | pitch | squares |
|---|---|---|---|
| 30 | 40 | 1.05 | 13 |
| 24 | 36 | 1.12 | 11 |
Roof Area = Length × Width × Pitch FactorPitch factor: 4/12 = 1. 05, 6/12 = 1. 12, 8/12 = 1. 20. One square = 100 sq ft.
Add 10% waste for hips, valleys and ridge
A roof pitch calculator determines the steepness of a roof, expressed as a ratio.
Estimate bricks and mortar for a wall build so you can plan quantities before final layout and waste adjustments.
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100 square feet of roof surface. Shingles are sold by the square.
Measure rise over 12 inches of run or use online pitch finder.