Rafter Length Calculator

Calculate Rafter Length



Formula

To calculate the rafter length (\(RL\)):

\[ RL = \frac{R}{\cos(a)} \]

Where:

What is a Rafter Length?

The rafter length is the distance from the top of the wall to the peak of the roof, along the slope of the rafter. It is an essential measurement in construction and carpentry for determining the length of the rafter needed to support the roof structure.

Example Calculation 1

Let's assume the following values:

Using the formula:

\[ RL = \frac{10}{\cos(0.785)} \approx \frac{10}{0.707} \approx 14.14 \text{ ft} \]

The rafter length is approximately 14.14 ft.

Example Calculation 2

Let's assume the following values:

Using the formula:

\[ RL = \frac{15}{\cos(0.523)} \approx \frac{15}{0.866} \approx 17.32 \text{ ft} \]

The rafter length is approximately 17.32 ft.