Rise, run and angle conversion
Roofing Pitch Calculator
Use matching measurement units to calculate an angle, slope percentage, one-in ratio and approximate rafter length.
Common roof pitches in Australia
| Pitch | Typical context |
|---|---|
| 5° | Low-slope metal roofing, subject to profile requirements |
| 10° | Low-pitch metal roof |
| 15° | Common metal roof pitch |
| 20° | Lower end for some tile systems |
| 22.5° | Common tiled roof pitch |
| 25° | Standard pitched roof |
| 30° | Steeper tile or slate roof |
| 35° | Steep or Federation-style roof |
| 45° | Very steep roof |
Planning notes
How roof pitch is measured
Pitch is the angle of the roof above horizontal. Rise is the vertical height and run is the horizontal distance from the wall line towards the ridge. Both measurements must use the same unit.
The result can be expressed in degrees, as a percentage, or as a one-in ratio. For example, a 25% slope rises one unit for every four horizontal units and is written as 1 in 4.
Roofing profiles and tile systems have specific minimum pitch, overlap and installation requirements. Always confirm the selected product specification and site drainage conditions before design or installation.
Continue planning
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Compare roof and gutter combinations using the current 22-colour COLORBOND® steel core palette.
From estimate to inspection
Need a quote based on your actual roof?
These tools are useful for early planning. A site inspection lets our team account for access, roof condition, drainage and the details unique to your property.