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

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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

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