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Example

Finding the Pitch of a Roof

A house has a sloped roof with a vertical rise of 99 feet and a horizontal run of 1818 feet. To find the slope (pitch) of the roof, apply the rise-over-run formula:

m=riserunm = \frac{\text{rise}}{\text{run}}

Substitute the given measurements:

m=918m = \frac{9}{18}

Simplify the fraction by dividing numerator and denominator by their greatest common factor (99):

m=12m = \frac{1}{2}

The slope of the roof is 12\frac{1}{2}, which means the roof rises 11 foot for every 22 feet of horizontal distance.

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Updated 2026-04-21

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