Roof & Rafter Calculator
Calculate dimensions and material needs for pitched and flat roofs.
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🏠Roof & Rafter Calculator
6/12 pitch = 26.6° angle
Roof Profile Visualization
How to Use This Calculator
- Enter the building width (the horizontal distance from outside wall to outside wall)
- Set the roof pitch (typically expressed as X/12, such as 6/12, meaning a 6 inch rise for every 12 inches of horizontal run)
- Specify the overhang length beyond the building walls
- Enter the ridge beam thickness and rafter thickness for accurate calculations
- The calculator will determine the common rafter length, ridge height, and bird's mouth cut details
What Users Say
"This calculator is so intuitive and easy to use. Helped me make better decisions!"
"I use this tool almost daily. So much better than complicated spreadsheets!"
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About Roof & Rafter Calculator
Our roof & rafter calculator provides a simple yet powerful way to calculate dimensions and material needs for pitched and flat roofs. Whether you're a professional in the field or just need quick calculations, this tool is designed to save you time and provide accurate results.
This calculator is completely free to use and requires no registration or personal information. All calculations are performed directly in your browser, ensuring your data remains private and secure.
Key Features
- Pitch & span inputs
- Rafter length
- Roof area
- Material usage
We're constantly working to improve our calculators based on user feedback. If you have suggestions for additional features or improvements, please contact us.