conversion from timber in tons to boardfeet?

Answer 1

1 T = (1 T) (1,000 kg/1.1 T) (1 m^3/ ρ kg) (10^6 cm^3/m^3) (1 in^3/16.387064 cm^3) (1 ft^2/144 in^2) (1 bf/in-ft^2) = (385,250.9 / ρ) bf
where ρ is in units of kg/m^3

From THE ENGINEERING TOOLBOX:
"The density of seasoned & dry wood can be found in the table below:

Wood Density, ρ (kg/m3)
Apple 660 - 830
Ash, black 540
Ash, white 670
Aspen 420
Balsa 170
Bamboo 300 - 400
British Birch 670
Cedar, red 380
Cypress 510
Douglas Fir 530
Ebony 960 - 1120
Elm - English 600
Elm - Rock 815
Larch 590
Lignum Vitae 1280 - 1370
Mahogany - Honduras 545
Mahogany - African 495 - 850
Maple 755
Oak 590 - 930
Parana Pine 560
Pine - Oregon 530
Pine - Canadian 350 - 560
Pine - Red 370 - 660
Redwood - American 450
Redwood - European 510
Spruce - Canadian 450
Spruce - Sitka 450
Sycamore 590
Teak 630 - 720
Willow 420"

Answer 2

Depends on the species of the wood, as well as on how dry it is. First responder's answer seems high, that would be 15 pounds per board foot, or 0.1042 pounds per cubic inch. Water weighs only 0.0361 pounds per cubic inch, and most wood floats. That answer may refer to unsawed logs, which would have a fair amount of waste.

Answer 3

Pine sawtimber: 7.50-7.75 tons = 1000 board ft