Roof Square Footage Calculator
Updated Formulas shown
Roof area is larger than the floor area underneath because of slope. A 60 × 32 ft footprint with a 7/12 roof has about 2,223 ft² of roof surface.
Roof area
2,223 ft²
22.2 squares incl. waste
- Roof surface area
- 2,223 ft²
- Roofing squares (with waste)
- 22.2
- Shingle bundles (3 per square)
- 67
- Pitch multiplier
- 1.158
- Underlayment rolls (4 sq)
- 6
Architectural shingles are usually 3 bundles per square; some heavy designer lines are 4–5. Add starter strip and ridge cap separately.
Related calculators
- Roofing CalculatorFree roofing calculator: house dimensions and pitch to roof area, squares, shingle bundles, underlayment and installed cost.
- Roof Pitch CalculatorConvert rise and run to roof pitch (x/12), angle in degrees, percent slope and area multiplier.
- Shingle CalculatorCalculate bundles of roof shingles from house size and pitch, including waste, starter and ridge notes.
Frequently asked questions
How do I calculate roof square footage without climbing on the roof?
Multiply the footprint (including overhangs) by the pitch factor. You can find the pitch from the attic or from a photo of the gable.
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Estimates only. Check quantities with your supplier or contractor before ordering.