Roof slope length from rise and run

How to use this calculator

1. Enter vertical rise (m). Use the unit shown beside the field.
2. Enter horizontal run (m). Use the unit shown beside the field.
3. Select Calculate and review the result. Select Reset to restore the example inputs.

How the calculation works

sqrt(Vertical rise (m)*Vertical rise (m)+Horizontal run (m)*Horizontal run (m))

Worked example

Vertical rise (m) = 3; Horizontal run (m) = 4. Result: 5 m.

Understand your result

Find one straight roof slope length from rise and horizontal run. The result is expressed in m.

Assumptions and limitations

Excludes overhangs and does not determine structural suitability. Results are rounded for display.

Questions about this tool