6/12 Roof Pitch
A 6/12 roof pitch rises 6 inches for every 12 inches of horizontal run. It equals a 26.57° roof angle and a 50% slope.
For every 12 inches of horizontal run, the roof rises 6 inches vertically.
What Does a 6/12 Roof Pitch Mean?
A 6/12 roof pitch means the roof rises 6 units vertically for every 12 units of horizontal distance. In U.S. roofing terminology this is commonly written as 6:12 or 6-in-12.
Because the rise is half of the horizontal run, the slope percentage is 50%. Converting the same ratio into an angle gives approximately 26.57 degrees.
A 6/12 pitch is noticeably steeper than lower slopes such as 3/12 or 4/12, while still being less steep than pitches such as 8/12 or 12/12.
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How a 6/12 Pitch Is Calculated
Roof Angle
Divide the rise by the run and convert the result to an angle using the arctangent function.
Slope Percentage
Roof slope percentage compares vertical rise directly with horizontal run.
Rafter Length
For a 12-inch horizontal run with a 6-inch rise, the basic diagonal rafter length is:
Pitch Factor
Pitch factor describes the roof surface length compared with the horizontal run.
6/12 Roof Pitch Conversion
| Measurement | 6/12 Value |
|---|---|
| Pitch Ratio | 6:12 |
| Roof Angle | 26.57° |
| Slope | 50% |
| Pitch Factor | 1.118 |
| Rafter Length for 12 in Run | 13.42 in |
6/12 Roof Pitch FAQs
What angle is a 6/12 roof pitch?
A 6/12 roof pitch has an angle of approximately 26.57 degrees above horizontal.
What percentage slope is 6/12?
A 6/12 pitch equals a 50% slope because the rise is one-half of the horizontal run.
How much does a 6/12 roof rise?
It rises 6 inches vertically for every 12 inches of horizontal run. The same ratio applies in other matching units.
What is the pitch factor for a 6/12 roof?
The pitch factor is approximately 1.118.
How long is a rafter for a 6/12 pitch?
For every 12 inches of horizontal run, the basic diagonal length is approximately 13.42 inches. Actual construction rafters may require additional length for overhangs, ridge details and cuts.
Is 6/12 the same as a 45-degree roof?
No. A 6/12 roof is approximately 26.57 degrees. A 45-degree roof corresponds to a 12/12 pitch.
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