Roofing Calculator
Estimate roofing squares for a pitched roof.
Interactive calculator
1.05 = low, 1.12 = 6/12, 1.25 = 12/12
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
Related calculators
Weekly playbook
One actionable business calculation every Tuesday.
Real frameworks for pricing, hiring, and software ROI. No fluff. Unsubscribe in one click.