perch | 1 per | 2 per | 3 per | 4 per | 5 per | 6 per | 7 per | 8 per | 9 per | 10 per | 11 per | 12 per | 13 per | 14 per | 15 per | 16 per | 17 per | 18 per | 19 per | 20 per | 21 per | 22 per | 23 per | 24 per | 25 per | 26 per | 27 per | 28 per | 29 per | 30 per | 31 per | 32 per | 33 per | 34 per | 35 per | 36 per | 37 per | 38 per | 39 per | 40 per | 41 per | 42 per | 43 per | 44 per | 45 per | 46 per | 47 per | 48 per | 49 per | 50 per | 51 per | 52 per | 53 per | 54 per | 55 per | 56 per | 57 per | 58 per | 59 per | 60 per | 61 per | 62 per | 63 per | 64 per | 65 per | 66 per | 67 per | 68 per | 69 per | 70 per | 71 per | 72 per | 73 per | 74 per | 75 per | 76 per | 77 per | 78 per | 79 per | 80 per | 81 per | 82 per | 83 per | 84 per | 85 per | 86 per | 87 per | 88 per | 89 per | 90 per | 91 per | 92 per | 93 per | 94 per | 95 per | 96 per | 97 per | 98 per | 99 per | 100 per |
board foot | 297 fbm | 594 fbm | 891 fbm | 1 188 fbm | 1 485 fbm | 1 782 fbm | 2 079 fbm | 2 376 fbm | 2 673 fbm | 2 970 fbm | 3 267 fbm | 3 564 fbm | 3 861 fbm | 4 158 fbm | 4 455 fbm | 4 752 fbm | 5 049 fbm | 5 346 fbm | 5 643 fbm | 5 940 fbm | 6 237 fbm | 6 534 fbm | 6 831 fbm | 7 128 fbm | 7 425 fbm | 7 722 fbm | 8 019 fbm | 8 316 fbm | 8 613 fbm | 8 910 fbm | 9 207 fbm | 9 504 fbm | 9 801 fbm | 10 098 fbm | 10 395 fbm | 10 692 fbm | 10 989 fbm | 11 286 fbm | 11 583 fbm | 11 880 fbm | 12 177 fbm | 12 474 fbm | 12 771 fbm | 13 068 fbm | 13 365 fbm | 13 662 fbm | 13 959 fbm | 14 256 fbm | 14 553 fbm | 14 850 fbm | 15 147 fbm | 15 444 fbm | 15 741 fbm | 16 038 fbm | 16 335 fbm | 16 632 fbm | 16 929 fbm | 17 226 fbm | 17 523 fbm | 17 820 fbm | 18 117 fbm | 18 414 fbm | 18 711 fbm | 19 008 fbm | 19 305 fbm | 19 602 fbm | 19 899 fbm | 20 196 fbm | 20 493 fbm | 20 790 fbm | 21 087 fbm | 21 384 fbm | 21 681 fbm | 21 978 fbm | 22 275 fbm | 22 572 fbm | 22 869 fbm | 23 166 fbm | 23 463 fbm | 23 760 fbm | 24 057 fbm | 24 354 fbm | 24 651 fbm | 24 948 fbm | 25 245 fbm | 25 542 fbm | 25 839 fbm | 26 136 fbm | 26 433 fbm | 26 730 fbm | 27 027 fbm | 27 324 fbm | 27 621 fbm | 27 918 fbm | 28 215 fbm | 28 512 fbm | 28 809 fbm | 29 106 fbm | 29 403 fbm | 29 700 fbm |
A traditional unit of volume for stone and other masonry. A perch of masonry is the volume of a stone wall one perch (16 1⁄2 feet or 5.03 metres) long, 18 inches (45.7 cm) high, and 12 inches (30.5 cm) thick. This is equivalent to exactly 24 3⁄4 cubic feet (0.92 cubic yards; 0.70 cubic metres; 700 litres).
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
perch | per | ≡ 16 1⁄2 ft × 1 1⁄2 ft × 1 ft | = 0.700841953152 m3 | Imperial/US |
perches | board feet | perches | board feet |
---|---|---|---|
1 | = 297 | 6 | = 1782 |
2 | = 594 | 7 | = 2079 |
3 | = 891 | 8 | = 2376 |
4 | = 1188 | 9 | = 2673 |
5 | = 1485 | 10 | = 2970 |
The board-foot is a specialized unit of measure for the volume of lumber in the United States and Canada. It is the volume of a one-foot length of a board one foot wide and one inch thick.
Board-foot can be abbreviated FBM (for "foot, board measure"), BDFT, or BF. Thousand board-feet can be abbreviated as MFBM, MBFT, or MBF. Similarly, million board-feet can be abbreviated as MMFBM, MMBFT, or MMBF.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
board foot | fbm | ≡ 144 cu in | ≡ 2.359737216×10−3 m3 | Imperial/US |
board feet | perches | board feet | perches |
---|---|---|---|
1 | = 0.0033670033670034 | 6 | = 0.02020202020202 |
2 | = 0.0067340067340067 | 7 | = 0.023569023569024 |
3 | = 0.01010101010101 | 8 | = 0.026936026936027 |
4 | = 0.013468013468013 | 9 | = 0.03030303030303 |
5 | = 0.016835016835017 | 10 | = 0.033670033670034 |
perches | board feet |
---|---|
1 | = 297 |
0.0033670 | = 1 |
Symbol | Definition |
---|---|
≡ | exactly equal |
≈ | approximately equal to |
= | equal to |
digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |