Size, Cubic Volume and Board Foot Volume in Pine Poles

Class and Min Circum. Length (Feet) Vol. (Cu.Feet) Average Volume, Board feet Average Volume,Board Feet Min. Circum. and Diam.
and Equiv. Diameter (In.) Int'l. rule 1/4“ Scribner Rule Equivalent to 6 ft. of
Form Class 80 First Log Circum. Diam.
Class 1 25 15.3 86 75 33.5 10.66
27” Circum. 30 20.4 114 125 36.5 11.62
8.59“ Diam. 35 26.2 153 155 39.0 12.41
40 32.6 182 205 41.0 13.05
45 39.3 217 245 43.0 13.69
50 46.6 271 280 45.0 14.32
55 54.3 306 335 46.5 14.80
60 62.6 342 385 48.0 15.28
65 71.1 397 420 49.5 15.76
70 80.1 441 495 51.0 16.23
75 89.5 486 535 52.5 16.71
Class 2 25 13.2 74 60 31.5 10.05
25” Circum. 30 17.8 96 105 34.0 10.82
7.96“ Diam. 35 22.8 131 135 36.5 11.62
40 28.2 158 175 38.5 12.25
45 34.1 189 210 40.5 12.89
50 40.4 231 240 42.0 13.37
55 47.1 261 295 43.5 13.85
60 54.2 295 325 45.0 14.32
65 61.6 344 365 46.5 14.80
70 69.5 381 425 48.0 15.28
75 77.7 410 500 49.0 15.60
Class 3 25 11.5 63 70 29.5 9.39
23” Circum. 30 15.4 82 85 32.0 10.19
7.32“ Diam. 35 19.7 107 115 34.0 10.82
40 24.5 135 150 36.0 11.46
45 29.5 157 180 37.5 11.94
50 35.0 194 205 39.0 12.41
55 40.8 222 250 40.5 12.89
60 47.0 249 280 42.0 13.37
65 53.4 294 310 43.5 13.85
70 60.2 328 340 45.0 14.32
75 67.3 352 380 46.0 14.64
Class 4 25 10.0 53 55 27.5 8.75
21” Circum. 30 13.3 68 70 29.5 9.39
6.68“ Diam. 35 17.1 92 90 31.5 10.03
40 21.2 112 130 33.5 10.66
45 25.6 134 145 35.0 11.14
50 30.4 165 170 36.5 11.62
55 35.4 189 190 38.0 12.10
60 40.7 208 215 39.0 12.41
65 46.4 245 240 40.5 12.89
70 52.2 277 265 41.5 13.21
Class 5 25 8.6 43 45 25.5 8.12
19” Circum. 30 11.6 55 55 27.5 8.75
6.5“ Diam. 35 14.8 75 75 29.0 9.23
40 18.4 93 100 31.0 9.87
45 22.2 107 120 32.5 10.35
50 26.3 137 140 34.0 10.82
Class 6 20 5.2 24 20 21.0 6.68
17” Circum. 25 7.5 32 35 23.0 7.32
5.41“ Diam. 30 10.0 43 45 25.0 7.96
35 12.8 62 65 27.0 8.59
40 15.9 75 85 28.5 9.07
45 19.3 90 100 30.0 9.55
Class 7 20 4.6 20 15 19.5 6.21
15” Circum. 25 6.4 27 25 21.5 6.84
4.77“ Diam. 30 8.6 36 35 23.5 7.48
35 11.1 49 55 25.0 7.96
Class 9 20 3.2 17 10 17.5 5.57
15” Circum. 25 4.7 24 20 19.5 6.21
4.77“ Diam. 30 6.4 32 25 20.5 6.53
Class 10 20 2.8 8 10 14.0 4.46
12” Circum. 3.82“ Diam. 25 4.0 14 15 15.0 4.77

Forest Farmer Manual, March 1975