Roofing Square Calculator
Convert measured roof surface area between square feet, square metres and roofing squares.
Materials Tool 5 of 6 · Output: Roofing squares
2Calculate & check
Enter measurements to see the result and its calculation schedule.
3Limits
A roofing square is a unit of area. It does not specify bundle count, shingle count or package coverage. Use the Roof Area Calculator first when you only know a horizontal projection.
How to use this calculator
- Enter the measured roof surface area and choose its unit. Do not enter an unconverted building footprint.
- Leave waste off for a direct conversion, or enable it and enter your chosen percentage, including zero if appropriate.
- Read the measured area separately from the area including your allowance.
Formula & method
w is the waste allowance you choose, expressed as a percentage. Decimal roofing squares are retained; this measurement is not rounded into a purchase quantity.
A worked example
Example inputs, not recommendations
2,000 sq ft equals 20 roofing squares, or 185.80608 m². If you explicitly choose a 10% allowance, the planned coverage becomes 2,200 sq ft, or 22 squares.
Assumptions & limitations
Assumes
- The input is measured sloping surface area.
- An enabled waste percentage is a planning choice supplied by you, not a recommended allowance.
Does not cover
A roofing square is a unit of area. It does not specify bundle count, shingle count or package coverage. Use the Roof Area Calculator first when you only know a horizontal projection.
Geometric planning estimate. This does not size structural members or verify loads, connections, or code compliance. Verify structural and code requirements against local code or with a qualified professional.
Displayed values are rounded; subsequent calculations retain full precision. Numerical limits and accepted formats are documented in Calculation methods.
Common questions
How large is a roofing square?
Exactly 100 square feet of area, equivalent to 9.290304 square metres. It is not a square-foot measurement or a shingle package.
Should I round squares up?
This tool keeps decimal squares because it reports area. Purchasing depends on the coverage and packaging of the product you select.
Is waste added automatically?
No. You must enable it and enter a percentage. Base area and allowance area are always shown separately; transfers to the Shingle Calculator use base area only.