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# Roof Slope Calculator

Roof slope calculation plays a vital role in designing the roof. The roof Pitch or roof slope will affect the interior volume of a building, the drainage, the style, and the covering material of roof. Slope measurements are determined by dividing the vertical rise in inches for every horizontal twelve-inch length. Commonly used roof slopes are flat roofs, low slope, and steep slope. Use online slope angle calculator to find the run, slope and angle of the roof.

## Slope Angle Calculator

length
/12
length
%
°

Roof slope calculation plays a vital role in designing the roof. The roof Pitch or roof slope will affect the interior volume of a building, the drainage, the style, and the covering material of roof. Slope measurements are determined by dividing the vertical rise in inches for every horizontal twelve-inch length. Commonly used roof slopes are flat roofs, low slope, and steep slope. Use online slope angle calculator to find the run, slope and angle of the roof.

#### Formula:

Run(inches)= ( 12 × Rise ) / Roof Pitch Slope = ( Rise / Run ) × 100 Angle = tan-1( Rise / Run )

### Example:

Find the Run, Slope, Angle values of a roof having Rise = 20 inches and Roof Pitch = 10.

#### Solution:

Run = ( 12 × Rise ) / Roof Pitch
= ( 12 × 20 ) / 10
= 24 inches
Slope = ( Rise / ( 12 × Rise ) / Roof Pitch ) × 100
= ( 20 / ( 12 × 20 ) / 10 ) × 100
= 83.3333 %
Angle = tan-1( Rise / ( ( 12 × Rise ) / Roof Pitch ) )
= tan-1( 20 / ( ( 12 × 20 ) / 10 ) )
= 39.8056 degree