24/12 roof pitch in degrees
A 24-in-12 roof — 24 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.
24/12 pitch =
=63.43°
Angle
63.43°
Percent grade
200%
Slope ratio
2
Rafter / ft of run
2' 2-13/16"
What it means on the roof
Set a speed square to 63.43° for the plumb and seat cuts. Every foot of horizontal run adds
2' 2-13/16" of common-rafter length, so a run of 10 ft makes a rafter about ten times that. The percent grade (200%) is the same slope a road sign or a laser level reads.Nearby pitches
Pitches around 24/12
The same math, offline
Every calc, on your tape measure — even with no signal.
TapeMath for iPhone runs this exact engine offline, adds rafters, stairs, studs, pitch and a paperless tape, and the key layout your thumbs already know. $9.99 once — no subscription, ever.
See the appComing soon — TapeMath is in final App Review. Meanwhile, use the free web calculator →