Roof Area Calculator
Calculate sloped roof surface area from plan dimensions and slope.
Calculator
Result
About this calculator
Calculate sloped roof surface area from plan dimensions and slope. Use the result as a planning estimate. Actual architectural, construction, lighting and building requirements can vary by project conditions, materials, local codes and professional specifications.
How to use this calculator
What to enter
Enter or select the following as requested: Roof length (m); Horizontal run for one slope (m); Rise (m); Number of sloped sides. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The area result estimates the two-dimensional surface covered by the dimensions entered. Check the displayed unit (for example, square metres or square feet) and whether openings, slopes, or waste allowances are included.
When to use it
Use this to estimate surface area for planning, material quantities, space measurement, or land measurement. Confirm that all dimensions use compatible units.