How to Calculate Roof Pitch

How-To -

How to Calculate Roof Pitch

What is Roof Pitch?

Roof pitch is the degree of slope to your roof, expressed as a ratio of rise over run - increase in vertical height per unit of length relative to the ground.

For example, this diagram shows a 10/12 pitch:

What does 'roof pitch' mean?

What's My Roof Pitch?

Here's the easiest way to calculate your roof pitch:

The easiest way to calculate roof pitch

  • On both sides of your roof, measure down 36" along the trim from the peak and make a mark.
  • Measure across the face of your gable, from mark to mark, and write down the value in inches.
  • Consult this chart:
Inches Across Roof Pitch
68-3/8" 4 / 12
66-1/2" 5 / 12
64-3/8" 6 / 12
62-1/4" 7 / 12
59-7/8" 8 / 12
57-5/8" 9 / 12
55-3/8" 10 / 12
53-1/8" 11 / 12
50-7/8" 12 / 12

 

Typically, you will be very close to one of these chart dimensions, but rare 'half pitch' roofs will fall somewhere in between values.

If your project needs a custom pitch, contact us for customization options.