Roof Angle Calculator
Calculate roof angles, pitch, and slope based on rise and run measurements. Determine roof angle in degrees, percentage, or as a ratio for construction and design projects.
Step 1: Roof Dimensions
Understanding Roof Pitch
Roof pitch is typically expressed as a ratio of vertical rise to horizontal run. A 6:12 pitch means 6 units of vertical rise for every 12 units of horizontal run.
Step 2: Calculation Options
About Roof Angles
Roof angles affect construction methods, material choices, and drainage efficiency. Steeper roofs shed water and snow better but require more materials and specialized installation.
Roof Angle Results
Roof Angle
Roof Type Comparison
| Roof Type | Typical Angle | Pitch Ratio | Common Use |
|---|
Roof Angle Formulas
Angle Calculation Formula
Angle (θ) = arctan(Rise ÷ Run)
Where: Rise = vertical height, Run = horizontal distance
To convert to percentage: Slope % = (Rise ÷ Run) × 100
Common Roof Pitch Standards
| Pitch Ratio | Angle | Slope % | Description |
|---|---|---|---|
| 1:12 | 4.76° | 8.3% | Minimum slope for drainage |
| 4:12 | 18.43° | 33.3% | Conventional roof |
| 6:12 | 26.57° | 50% | Typical residential |
| 9:12 | 36.87° | 75% | Steep roof |
| 12:12 | 45° | 100% | Equal rise and run |
Need Professional Roof Analysis?
Connect with our construction experts for detailed roof analysis, material recommendations, and structural calculations for your building projects.
Get Professional Analysis