Roof Plane Area calculator.
Sum the geometric area of specified roof planes from horizontal run, rise and ridge length.
Your inputs
Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.
A clear estimate starts here.
Enter your dimensions and product details to see the quantity and purchase breakdown.
Formula and assumptions
How this calculation works.
Run and rise describe one plane’s cross-section. Enter each plane separately and use slope-measured area for deductions. No roof shape, pitch or structural member is chosen.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Horizontal run
- 4 m
- Vertical rise
- 3 m
- Plane length parallel to ridge
- 6 m
- Excluded area measured on the slope
- 2 m²
Roof surface area: 28 m²
Before you purchase
Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.