ClarityHow to use this tool
- Enter area to cover, roof pitch angle.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
The method, explained
Sloped area = horizontal plan area/cos(pitch angle).
Using area to cover = 20 m², roof pitch angle = 30 degrees, the result is 23.0940108 m². Change these example inputs to match your task; use the method above to check each step.
What to keep in mind
Uniform pitch; enter footprint including desired overhangs. A material-quantity estimate, not a structural design or building-code check. Confirm site measurements, supplier coverage and waste before ordering.
Common questions
Which inputs does this calculation need?
Estimate sloped area from horizontal footprint and uniform pitch. Enter area to cover in m², roof pitch angle in degrees. The filled example is editable and is not a saved personal record.
How should I interpret the result?
Uniform pitch; enter footprint including desired overhangs. A material-quantity estimate, not a structural design or building-code check. Confirm site measurements, supplier coverage and waste before ordering.
Methodology maintained by ClarityKit. How these tools are built and checked.