Spike's Calculators

Calculate the amount of board feet in a log using the International 1/4-inch Log Rule online.

The International 1/8-inch Log Rule was developed by Judson F. Clark in 1906 while working for the Province of Ontario. In 1917, it was modified to allow for a 1/4-inch kerf. The International 1/4-inch Log Rule is considered the most accurate mathematical log rule for calculating board feet.

The first result listed is what the calculator is intended to calculate.

The conversions for the other volume measurements are derived from the first one.

Board Foot * 0.0833333 = Cubic Foot

Board Foot * 0.00235974 = Cubic Meter

- select the length of your log
- the diameter measured inside the bark at the small end of the log in inches

- the number of board feet in your log
- the board feet converted to cubic feet
- the board feet converted to cubic metres

one board foot (bf) = 0.0833333333333333 cubic feet (ft³) one board foot (bf) = 0.002359737216 cubic metres (m³)

- Brereton Log Rule - Imperial Measurements
- Blodgett Foot Rule
- Doyle Log Rule
- Early Log Rule
- International 1/8-inch Log Rule
- International 1/4-inch Log Rule
- International 1/4-inch Log Rule (Grosenbaugh)
- International 1/8-inch and 1/4-inch Log Rules
- Roy Log Rule
- Ontario Log Rule
- Scribner Log Rule
- Scribner Log Rule: Board Foot Volume of a Tree
- Scribner Decimal C
- Comparing Results from Various Board Feet Log Rules