Como usar Roof Pitch Calculator — calculate roof pitch from rise and run
Convert roof rise and horizontal run into pitch angle and slope ratio for planning, comparison and material calculations.
Pitch angle = arctangent(rise ÷ horizontal run). The run is the horizontal distance, not the sloping rafter length.
Convert roof rise and horizontal run into pitch angle and slope ratio for planning, comparison and material calculations. The linked Sellible tool keeps the fields, units and output together so the assumptions can be reviewed before the result is used.
- 1
Measure vertical rise and horizontal run in the same unit.
- 2
Enter both values without substituting the rafter length.
- 3
Use the angle for related rafter, tile and drainage checks.
Example values and result
These values demonstrate the method; replace them with measurements, rates or file details that match the real task.
- Roof rise
- 2.0 m
- Horizontal run
- 4.0 m
- Slope ratio
- 1 : 2
- Pitch angle
- about 26.6°
A rise of 2 m over a 4 m horizontal run is approximately 26.6 degrees. Use surveyed dimensions and confirm the convention used on drawings.
Precisão e orientação prática
- Confirm whether the project states degrees, ratio or percentage.
- Measure to consistent reference points.
- Check product minimum pitch and local design requirements.
Common mistakes
- Using total building width instead of half-span for a symmetrical roof.
- Measuring along the slope for the run.
- Assuming roof pitch alone proves weather performance.
A free account makes repeat tasks simpler
Email-link sign-in keeps file jobs, downloads, support and usage available across devices. Browser calculators remain free.
Perguntas frequentes
Is Roof Pitch Calculator free?
Yes. This calculator or browser utility is free and does not use processing credits.
Can I use this guide and Roof Pitch Calculator on a phone?
Yes. The guide, inputs, results and calls to action are responsive and keyboard accessible on current phones, tablets and desktop browsers.
Should I order or make a decision from the estimate alone?
No. Confirm whether the project states degrees, ratio or percentage. Measure to consistent reference points. The calculation is a planning aid rather than professional or regulatory approval.
How should I check the result?
Keep the source values and units visible, compare the result with supplier or project information, and retain enough precision until the final purchasing or reporting step.