Roof Pitch Calculator
Calculate roof pitch as X:12, angle in degrees, slope percentage, and the roof area multiplier. Enter rise and run measurements or a pitch ratio to get instant results.
Results
Pitch
6.0:12
Angle
26.6°
Slope
50.0%
Area Multiplier
1.118
Common Pitch Factor Table
| Pitch | Angle | Slope % | Area Multiplier |
|---|---|---|---|
| 1:12 | 4.8° | 8.3% | 1.003 |
| 2:12 | 9.5° | 16.7% | 1.014 |
| 3:12 | 14.0° | 25.0% | 1.031 |
| 4:12 | 18.4° | 33.3% | 1.054 |
| 5:12 | 22.6° | 41.7% | 1.083 |
| 6:12 | 26.6° | 50.0% | 1.118 |
| 7:12 | 30.3° | 58.3% | 1.158 |
| 8:12 | 33.7° | 66.7% | 1.202 |
| 9:12 | 36.9° | 75.0% | 1.25 |
| 10:12 | 39.8° | 83.3% | 1.302 |
| 11:12 | 42.5° | 91.7% | 1.357 |
| 12:12 | 45.0° | 100.0% | 1.414 |
How to Use This Calculator
Select your input mode: enter a rise and run in inches, or enter a pitch ratio directly (the rise per 12 inches of run). The calculator outputs the pitch in X:12 format, the angle in degrees, slope as a percentage, and the roof area multiplier (used to convert flat area to actual roof area). Scroll down for a handy reference table of common pitches.
Formula Used
Pitch = (Rise / Run) x 12. Angle = arctan(Rise / Run) in degrees. Slope % = (Rise / Run) x 100. Area Multiplier = sqrt(1 + (Rise / Run)^2).
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Disclaimer
This calculator is for estimation purposes only. Results may vary based on local conditions, materials, and building codes. Always consult a licensed professional before making decisions based on these calculations. MyContractorTools is not responsible for any errors or omissions.