What is Roof Pitch Calculator?
A roof pitch calculator helps determine the slope of a roof by measuring vertical rise versus horizontal run. Essential for roofing projects, it ensures proper water drainage and material estimation. Our calculator provides instant results for roof angle, slope ratio, and grade percentage. Perfect for contractors, architects, and DIY enthusiasts planning roof installations or repairs.
Roof Pitch Formula
Pitch = (Rise ÷ Run) × 12
Example: 6" rise over 12" run = (6/12)×12 = 6/12 pitch
How to Use
1. Measure vertical rise from roof base to peak
2. Measure horizontal run from edge to edge
3. Enter measurements in inches
4. Get instant pitch ratio, angle, and percentage
5. Compare with standard roofing pitches in our chart
Roof Pitch Chart
| Pitch | Angle | Slope Factor |
|---|
Advantages & Disadvantages
Advantages:
- Accurate material estimation for roofing projects
- Helps prevent water pooling and leaks
- Essential for proper snow load calculations
- Improves roof ventilation planning
- Standardized measurement for contractor communication
Disadvantages:
- Requires precise physical measurements
- Doesn't account for roof complexity/obstacles
- Needs conversion for metric measurements
- Doesn't calculate material waste factor
- Limited to basic roof shapes
FAQs
What is standard roof pitch?
Most residential roofs use 4/12 to 9/12 pitch. Lower slopes (2/12-4/12) require special materials, while steeper pitches offer better drainage but need more materials.
How to measure roof pitch without calculator?
Use a level and tape measure: mark 12" horizontally, measure vertical rise. The rise over 12" gives your pitch ratio (e.g., 5" rise = 5/12 pitch).