Paste the log list from the yard and get board feet by Doyle, Scribner and International 1/4-inch, cubic volume, cords and green tons, with the lot value in the price unit you trade on.
Pre-sizing and estimating tool: results do not replace design, calculations or reports signed by a licensed professional, nor verification against the applicable codes and standards.
Same logs, inside bark, by the four formulas.
Main-method volume grouped by small-end diameter inside bark (2-inch classes).
Total of the list by each rule, and the cubic volume times 12 (the most lumber a log could hold with no saw kerf or slabs).
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It scales a list of logs in board feet by the three common US log rules (Doyle, Scribner Decimal C and International 1/4-inch) and in cubic volume by Smalian, Huber and Newton. It also converts to cords and green tons and prices the lot per MBF, cord or ton. Use it to check a load, compare offers or estimate a timber sale.
Each rule assumes a different saw kerf, slab allowance and taper. Doyle subtracts 4 in from the diameter, so it underestimates small logs; International 1/4-inch adds 1/2 in of taper every 4 ft and is close to a good mill’s output. In the example, the 13 logs scale 913 bf Doyle, 1,100 bf Scribner Decimal C and 1,234 bf International.
Measure the small-end diameter inside bark, averaging two readings at right angles, and round to the nearest inch. Use the scaling length net of trim allowance, in whole feet. For cubic formulas, also read the large end and the middle; leave the middle blank if you do not have it.
The lot of 13 southern pine logs scales 1,234 bf by International 1/4-inch, or 192 ft³ of solid wood, about 2.2 cords stacked and 5.9 green short tons. At $300 per MBF, the lot is worth about $370. On Doyle the same logs would be 913 bf, so a Doyle price must be about 35% higher per MBF to pay the same.
Use the rule written in your contract or customary in your region: Doyle is common in the South and Midwest, Scribner Decimal C in the West and on federal timber, and International 1/4-inch in some Northeastern states and for research. Compare prices only on the same rule.
Scribner Decimal C uses the official table for 8, 12, 16 and 20 ft and interpolates other lengths, which can differ by 10 bf from the official value. Defect deductions (rot, sweep, crook, splits), trim rules and official segment rules for long logs are not applied. Green weight depends on moisture, which changes with time in the yard.
A cord is 128 ft³ of stacked wood, with roughly 80 to 90 ft³ of solid wood depending on the stacking factor. There is no fixed conversion to board feet, because log rules depend on log size; for sawlogs, scale them by a log rule instead of converting cords.
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