Estimate Scribner Decimal C board feet from small-end diameter inside bark and log length.
Formula Scribner estimate
Board feet = (0.79D² − 2D − 4) × L ÷ 16, where D is small-end diameter inside bark in inches and L is length in feet. The displayed per-log result is rounded to the nearest 10 board feet to follow common Decimal C table increments.
How to measure
Measure the average small-end diameter inside bark. Enter the merchantable log length. Local scaling procedures may prescribe trim, diameter rounding and defect deductions.
Scale limitation
Scribner is a board-foot log rule, not solid cubic volume. Formula estimates and official/local tables can differ because of rounding and scaling practice; actual sawn recovery also depends on taper, defects, kerf, grade and mill setup.
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