Roof Pitch Calculator
Calculate roof pitch, slope angle, rafter length, and roof area
Roof Pitch Inputs
Enter rise and run measurements
Vertical height
Horizontal distance
Common Roof Pitches
Pitch Results
Pitch Ratio
0:0
Pitch Angle
0.00°
Pitch Percentage
0.0%
Roof Category
Low Slope
Additional Calculations
Rafter Length per ft0.00 ft
Roof Slope Length0.00 ft
Total Roof Area0.00 ft²
Roof Pitch Diagram
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About Roof Pitch
What is Roof Pitch?
Roof pitch is the steepness or slope of a roof, typically expressed as a ratio of vertical rise to horizontal run. For example, a 6/12 pitch means the roof rises 6 inches for every 12 inches of horizontal distance. It can also be expressed in degrees or as a percentage.
How to Use
- Select your measurement unit (feet or meters)
- Enter the rise (vertical height) and run (horizontal distance)
- Optionally enter roof dimensions for area calculation
- View pitch ratio, angle, percentage, and other calculations
- Use common pitches for quick reference
- Click copy buttons to copy specific values
Roof Pitch Categories
- Low Slope (0-10°): Nearly flat, requires special roofing materials
- Conventional (10-20°): Common for residential roofs, easy to walk on
- Medium Slope (20-35°): Standard residential pitch, good water drainage
- Steep Slope (35-45°): Excellent drainage, more difficult to install
- Very Steep (45°+): Dramatic appearance, challenging to work on
Features
- Calculate pitch ratio, degrees, and percentage
- Rafter length calculation
- Total roof area calculation
- Support for feet and meters
- Common pitch presets
- Visual roof diagram
- Copy results to clipboard
- Pitch category classification
- Real-time calculations
Standard Pitch Notation
In the US, roof pitch is commonly expressed as a ratio with 12 as the run (e.g., 6/12, 8/12). This represents the rise in inches for every 12 inches of horizontal run. A 6/12 pitch is also called a "6 in 12" pitch and equals approximately 26.57 degrees.