Table 1.2 - Factors to convert tree volume (cubic feet) to carbon (pounds)
Specific gravity1 Percent carbon2 Factor3
Region Forest type Softwood Hardwood Softwood Hardwood Softwood Hardwood
Southeast and South Central Pines .510 .639 .531 .497 16.90 19.82
Oak-hickory .536 .639 .531 .479 17.76 19.82
Oak-pine .523 .639 .531 .497 17.33 19.82
Bottomland hardwoods .460 .580 .531 .497 15.24 17.99
Northeast and Mid-Atlantic Pines .378 .543 .521 .498 12.29 16.87
Spruce-fir .369 .525 .521 .498 12.00 16.31
Oak-hickory .374 .636 .521 .498 12.16 19.76
Maple-beech-birch .384 .600 .521 .498 12.48 18.65
Bottomland hardwoods .460 .580 .521 .498 14.96 17.99
North Central and Central Pines .421 .530 .521 .498 13.69 16.47
Spruce-fir .351 .480 .521 .498 11.41 14.92
Oak-hickory .416 .632 .521 .498 13.52 19.64
Maple-beech .372 .576 .521 .498 12.09 17.90
Aspen-birch .370 .465 .521 .498 12.03 14.45
Bottomland hardwoods .460 .580 .521 .498 14.96 17.99
Rocky Mountain and Pacific Coast Douglas-fir .473 .380 .512 .496 15.11 11.76
Ponderosa pine .416 .380 .512 .496 13.29 11.76
Fir-spruce .349 .380 .512 .496 9.80 10.67
Hemlock-Sitka sp. .434 .433 .512 .496 12.17 12.16
Lodgepole pine .423 .380 .512 .496 11.86 10.67
Larch .508 .433 .512 .496 14.26 12.16
Redwoods .416 .580 .512 .496 11.68 16.29
Hardwoods .424 .384 .512 .496 11.90 10.77

1 Weighted average specific gravity of the three most common (in terms of volume) softwood or hardwood species within the forest type.
2 From Koch (1989).
3 Factor = specific gravity times the weight of a cubic foot of water (62.4 lbs) times percent carbon.