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`RL = f( "S" ,"4/12", 6 )`

Enter a value for all fields

The **Rafter Length **calculator computes the length of the rafters based on the span, pitch and overhang.

**INSTRUCTIONS:** Choose units and enter the following:

- (
**S**) Span, horizontal length of the run (see diagram) - (
**P**) Pitch of the roof (choose one) - (
**oH**) Overhang

**Rafter Length (RL):** The rafter length is returned in feet. However this can be automatically converted to other units via the pull-down menu.

Using the pitch and the span, the initial rafter length is computed. The calculator takes into consideration the 1.75 inches of the ridge board. There is then an adder for the additional length associated with the overhang.

- Area of a Roof
- Pitch of a Roof
- Number of Trusses Needed for a Roof
- 4x8s needed for a roof
- Shingles needed for a roof
- Number and Length of Metal Roof Panels
- Number and Length of Purlins
- Number and Length of Rafters
- Number and Length of Rafter and Collar ties