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17/12 roof pitch in degrees

A 17-in-12 roof — 17 inches of rise for every 12 inches of run — as an angle, a percent grade, a slope ratio, and the rafter length it adds per foot of run.

17/12 pitch =

=54.78°

Angle

54.78°

Percent grade

141.6667%

Slope ratio

1.416667

Rafter / ft of run

1' 8-13/16"

What it means on the roof

Set a speed square to 54.78° for the plumb and seat cuts. Every foot of horizontal run adds 1' 8-13/16" of common-rafter length, so a run of 10 ft makes a rafter about ten times that. The percent grade (141.6667%) is the same slope a road sign or a laser level reads.

Nearby pitches

Pitches around 17/12

Pitch	Angle	Grade	Rafter / ft run
14/12	49.40°	116.6667%	1' 6-7/16"
15/12	51.34°	125%	1' 7-3/16"
16/12	53.13°	133.3333%	1' 8"
17/12	54.78°	141.6667%	1' 8-13/16"
18/12	56.31°	150%	1' 9-5/8"
19/12	57.72°	158.3333%	1' 10-1/2"
20/12	59.04°	166.6667%	1' 11-5/16"

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