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Board Feet Calculator for Lumber and Logs

Lumber board feet are thickness × width × length(ft) / 12. Log scales: Doyle ((D−4)² × L) / 16, Scribner (0.79D² − 2D − 4) × L / 16, International ¼″ in 4-foot sections with a ½″ taper. Doyle undercounts small logs.

Quick Summary & Direct Answer
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How many board feet is a 2×8×10?

(2 × 8 × 10) / 12 = 13.33 board feet. A 16 in × 10 ft log is about 90 bf Doyle, 104 bf Scribner, and about 106 bf International ¼″ (two 4-foot sections plus a 2-foot remainder with ½ in taper).

Key Takeaways

  • Sawn lumber uses the /12 formula.
  • Log rules disagree on purpose; mills pick one.
  • International ¼″ steps down diameter 0.5 in per 4 ft.

Sawn lumber

13.33 bf

Doyle90 bf
Scribner103.9 bf
International ¼″106.2 bf

Results can be wrong. This calculator is unofficial. Figures can be incomplete, rounded, or not updated. Use them at your own risk and check a tape, datasheet, ball band, or official chart before cutting, mixing, buying, or publishing. Doyle, Scribner, and International ¼″ are different mill rules, not three measurements of the same log. Kerf and drying shrink are omitted. Limits of liability are in the terms of service.

Frequently asked questions

Doyle subtracts a large slab; small logs look worse. International ¼″ is closer to sawn yield.

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Publisher notes · reviewed 29 October 2026

A board foot is 144 cubic inches

Sawn lumber: T×W×Lft/12. Doyle ((D−4)²L)/16 undercounts small logs. Scribner uses 0.79D²−2D−4. International ¼″ walks 4-foot sections with ½ in taper.

Which log rule

Mills pick one. Do not average them. Doyle is common in the eastern US; International ¼″ is closer to sawn yield.

Worked examples

  • 2×8×10

    13.33 board feet sawn.

Limits of this page

  • Kerf and drying shrink are omitted.
  • Square feet of flooring is a different unit.

Sources