Pitch = 4
Pitch Angle = 18.43
2X material width is 3.5, 5.5, 7.5, 9.5, 11.5

Height Above PLate Table -- 4 / 12 Rafter Seat Cut Length -- Each rows shows seat cut length with H.A.P for material size
Material Plumb height 1 1/2 2 2 1/2 3 3 1/8 3 1/2 4 5 1/8 5 1/2 6 3/4
2x4 3.69 3.19 3.02 2.86 2.69 2.65 2.52 2.36 1.98 1.86 1.44
2x6 5.80 5.30 5.13 4.96 4.80 4.76 4.63 4.46 4.09 3.96 3.55
2x8 7.91 7.41 7.24 7.07 6.91 6.86 6.74 6.57 6.20 6.07 5.66
2x10 10.01 9.51 9.35 9.18 9.01 8.97 8.85 8.68 8.31 8.18 7.76
2x12 12.12 11.62 11.46 11.29 11.12 11.08 10.96 10.79 10.41 10.29 9.87
1 3/4 X 11 7/8 12.52 12.02 11.85 11.68 11.52 11.48 11.35 11.18 10.81 10.68 10.27