Enter the roof angle (degrees) into the Roof Slope Calculator. The calculator will evaluate and display the Roof Slope. 

Roof Slope Formula

The following formula is used to calculate the Roof Slope. 

RS = tan (ra)

  • Where RS is the Roof Slope (Y:1)
  • ra is the roof angle (degrees) 

How to Calculate Roof Slope?

The following example problems outline how to calculate Roof Slope.

Example Problem #1:

  1. First, determine the roof angle (degrees). 
    • The roof angle (degrees) is given as: 45.
  2. Finally, calculate the Roof Slope using the equation above: 

RS = tan (ra)

The values given above are inserted into the equation below and the solution is calculated:

RS = tan (45deg) = 1 (Y:1)


Example Problem #2: 

For this problem, the variables needed are provided below:

roof angle (degrees) = 60

This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer. RS = tan (ra) = ?