Scribner Scale Calculator - Free Online Tool

Calculate your scribner scale with our free online tool.

Get accurate results instantly.

No signup required.

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How This Tool Works

The Scribner Scale Calculator estimates board feet from round-log measurements using the Scribner Decimal C log rule. Enter the small-end diameter in inches, the log length in feet, and the number of logs. The calculator returns the rounded Decimal C board-foot estimate and the exact value before rounding.

Decimal C rounds the per-log estimate to the nearest 10 board feet, so it is intended for sawlog scaling rather than finished-board dimension conversion.

  • Input: Small-end log diameter in inches.
  • Input: Log length in feet and number of logs.
  • Output: Estimated board feet under the Scribner Decimal C rule.

Why This Matters

Scribner log scaling is used in timber buying, mill delivery checks, and forestry planning to estimate recoverable board footage before a log is sawn. Using the same rule as the buyer, seller, or mill keeps board-foot estimates comparable.

The result is still an estimate. Species, taper, sweep, defect, bark conventions, and mill setup can all change the final lumber yield from the scaled board-foot value.

Common Mistakes to Avoid

  • Do not enter nominal board sizes: this calculator is for round logs, not finished lumber such as 2x4s.
  • Measure the small end: use the log's small-end diameter in inches unless your scaling standard says otherwise.
  • Keep scale rules separate: Scribner, Doyle, and International rules can give different estimates for the same log.

Frequently Asked Questions

Common questions about the Scribner Scale Calculator - Free Online Tool

A board foot is 144 cubic inches (12"×12"×1"). Calculate as: (thickness" × width" × length") ÷ 144. This calculator handles the conversion automatically.
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