Roof Pitch Multiplier Calculator
Enter flat (footprint) area and roof pitch to calculate actual roof area using the pitch multiplier.
sq ft
Actual Roof Area
—sq ft
Multiplier—
Squares—
Pitch Multiplier Table
Roof area = Flat area × Pitch multiplier. A 4/12 pitch has a 1.054 multiplier.
| Pitch | Multiplier |
|---|---|
| 3/12 | 1.031 |
| 4/12 | 1.054 |
| 5/12 | 1.083 |
| 6/12 | 1.118 |
| 8/12 | 1.202 |
| 10/12 | 1.302 |
| 12/12 | 1.414 |