Also in: Disaster Response and Recovery
Timber Cruise (Doyle / Scribner / International 1/4)
Board feet per log by Doyle, Scribner Decimal C (Koch table, by diameter and length), or International 1/4.
Example
You enter
- Small-end DIB (in) 14
- Log length (ft) 16
- Rule doyle
- Price ($/bf, optional) 0.4
You get
- Board feet 100.0
- Estimated stand value $40.00 (bf x $/bf)
Checked against published worked examples from: University of Tennessee Agricultural Extension Service; University of Washington Rural Technology Initiative...
Details, formula, and sources
Formula or tableDoyle: BF = ((D − 4)² × L) / 16. Scribner Decimal C: from public tabulated values keyed to D (in) and L (ft). International 1/4 inch: BF = 0.905 × (0.22 × D² − 0.71 × D) per 4-ft section, D rising 1/2 in per section for taper (a short last section pro rata).
Source and editionPublic log-volume tables (Doyle 1825, Scribner Decimal C, International 1/4-inch USDA Forest Service publications); USDA Forest Service Manual 2400 by name.
Free accessFree at fs.usda.gov.
What governsEstimate. AHJ and licensed professional govern.
API field namessmall_end_dib_in, log_length_ft, rule, price_per_bf, board_feet, value_usd
- Log length basis 16-ft logs unless user supplies a different segment lengthUSDA Forest Service convention