Roofing Calculator
Estimate roofing squares for a pitched roof.
Roofing Calculator
1.05 = low, 1.12 = 6/12, 1.25 = 12/12
Live result
Roofing squares
1 square = 100 ft²
13.2
Roof area
1,320
Shingle bundles (3/sq)
40
What it is
Roofing is sold by the 'square' — 100 ft² of roof surface. Multiply the house footprint by a pitch factor to get the actual roof area.
The formula
Roof area = footprint × pitch multiplier Squares = area ÷ 100
Why it matters
Understanding roofing calculator helps you make a better-informed decision before you commit money or time.
Worked examples
Try the example
Use the defaults above as a starting point — then adjust the inputs to match your situation.
Common pitfalls
- Double-check the units on every input — most errors come from mixing units.
- Round at the end, not in the middle of the formula.
Frequently asked questions
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