Rake Crown To Horizontal Crown

Spring Angle
Degrees input: use any crown spring angle in degrees like 38.00°

Roof Slope Angle
This is the roof slope angle of the building. See below for typical roof slope angles. This is measured in the vertical plane. An 8:12 roof pitch is = 33.69007° You can enter 33.69007° or the total vertical plane angle as 123.69007° (90° + 33.69007° = 123.69007°) Use your angle finder if you don't know the roof slope angle. The Wall Corner Angle Must be at 90° to calculate the correct Roof Slope Angle.

Calculated Results for the Crown Molding Angles.

Crown Miter Angle for material laying flat in compound miter saw
Crown Saw Blade Bevel Angle for material laying flat in compound miter saw
Crown Nested in compound miter saw

Calculate Spring Angle.
Use the Spring Angle Calculator to enter the rise and run of the crown molding to calculate the spring angle for the crown molding your using.

Roof Pitch in Inches per Rise of Roof in 1 Foot of Run -- Roof Slope Angles

0.5:12 = 2.38594°
1:12 = 4.76364°
1.5:12 = 7.12502°
2:12 = 9.46232°
2.5:12 = 11.76829°
3:12 = 14.03624°
3.5:12 = 16.26020°
4:12 = 18.43495°
4.5:12 = 20.55605°
5:12 = 22.61986°
5.5:12 = 24.62356°
6:12 = 26.56505°
6.5:12 = 28.44293°
7:12 = 30.25644°
7.5:12 = 32.00538°
8:12 = 33.69007°
8.5:12 = 35.31121°
9:12 = 36.86990°
9.5:12 = 38.36749°
10:12 = 39.80557°
10.5:12 = 41.18593°
11:12 = 42.51045°
11.5:12 = 43.78112°
12:12 = 45.00000°
12.5:12 = 46.16914°
13:12 = 47.29061°
13.5:12 = 48.36646°
14:12 = 49.39871°
14.5:12 = 50.38931°
15:12 = 51.34019°
15.5:12 = 52.25319°
16:12 = 53.13010°
16.5:12 = 53.97263°
17:12 = 54.78241°
17.5:12 = 55.56101°
18:12 = 56.30993°
18.5:12 = 57.03060°
19:12 = 57.72436°
19.5:12 = 58.39250°
20:12 = 59.03624°
20.5:12 = 59.65675°
21:12 = 60.25512°
21.5:12 = 60.83239°
22:12 = 61.38954°
22.5:12 = 61.92751°
23:12 = 62.44719°
23.5:12 = 62.94940°
24:12 = 63.43495°