Roof Framing Calculators
Calculate rafter length, roof angle, and lumber requirements for roof framing projects. Use this tool to plan roof structures, estimate materials, and verify measurements before ordering lumber. It works for common roof types such as gable, shed, and porch designs.
When to use this calculator
- You're planning a new roof and need rafter length before ordering lumber.
- You're building a shed, porch, or garage roof and want the rafter geometry for a given pitch.
- You're checking a contractor's lumber quote against your own measurements.
- You need to know the board length and total lineal feet to buy for a set number of rafter pairs.