Use this gambrel roof truss calculator to easily determine the key dimensions and materials needed for your roofing project.

**How to Use the Calculator:**

To calculate the rafter length for a gambrel roof, follow these steps:

- Enter the ridge length in feet.
- Enter the roof pitch as x/12 (for example, 4/12).
- Enter the length of the overhang in feet.
- Enter the height of the eave in feet.
- Click the “Calculate” button.
- Review the result provided in the “Result” field.

**How the Calculator Works:**

This calculator uses the following formula to determine the total rafter length for a gambrel roof:

Total Rafter Length = sqrt((Ridge Length/2)^{2} + (Pitch)^{2}) + Eave Height + Overhang

**Limitations:**

This calculator assumes symmetrical gable roof shapes and does not take into account unique architectural features or non-standard designs. Measurements should always be double-checked by a professional to account for factors such as load requirements, lumber size variations, and local building codes.

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