Roof Angle Calculator

For any roof framing, angle plays a vital role. In rise run angle calculator, the angle of the roof can be found by determining the angle between the rafters and it varies based on the size of the roof slope. In metric measurement system, pitch of the roof is measured by knowing the angle or per unit of run, which can be expressed as '1 in x' slope, a 1 in 1 slope being 45°. Use online roof angle calculator to find the angle, run and roof pitch by providing the rise and slope value.

Rise Run Angle Calculator

length
%
°
/12
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Formula:

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

Example:

If the rise of a roof = 40 inches and slope = 12%, Find the other roofing parameters?

Solution:

Run = ( Rise / Slope ) × 100
= ( 40 / 12 ) × 100
= 333.3333 inches
Angle = tan-1( Rise / ( ( Rise / Slope ) × 100 ) )
= tan-1( 40 / ( ( 40 / 12 ) × 100 ) )
= 6.8428°
Roof Pitch = ( 12 × Rise ) / ( ( Rise / Slope ) × 100 )
= ( 12 × 40 ) / ( ( 40 / 12 ) × 100 )
= 1.44

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