rafter calculator with birds mouth
Calculate Rafter Length
About Rafter Length Calculator
This calculator determines rafter length, angles, and material requirements for roof construction based on building dimensions and roof pitch.
Rafter Length Formula:
Length = √(Run² + Rise²) + Overhang
Common Rafter Sizes:
- 2x6: Up to 10 ft span
- 2x8: Up to 13 ft span
- 2x10: Up to 16 ft span
- 2x12: Up to 20 ft span
- 2x14: Up to 24 ft span