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Rafter Length Calculator
Calculate common rafter length, total rise, and roof pitch dimensions
Rafter Geometry Standard: $\text{Rafter Length} = \sqrt{\text{Run}^2 + \text{Rise}^2}$, where $\text{Run} = \frac{\text{Span}}{2}$ and $\text{Rise} = \text{Run} \times \frac{\text{Pitch}}{12}$.
Building Span & Roof Pitch
Calculation Results
⚠️ Rafter length calculations measure from the outside of the top plate to the ridge peak (excluding ridge board thickness adjustment). Always verify bird's mouth cut dimensions and local snow/wind load codes.