Board Foot Log Calculator

Board Feet Formula:

\[ \text{Board Feet} = 0.79 \times D^2 \times L - 1.87 \times D \times L \]

(International 1/4 rule approximation)

Board Feet (board ft):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is a Board Foot Log Calculator?

Definition: This calculator estimates the volume of lumber in board feet that can be obtained from a log using the International 1/4 rule approximation.

Purpose: It helps loggers, sawmill operators, and woodworkers estimate the usable lumber yield from logs.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \text{Board Feet} = 0.79 \times D^2 \times L - 1.87 \times D \times L \]

Where:

\( \text{Board Feet} \) — Volume of lumber (1 board foot = 1 ft × 1 ft × 1 in)
\( D \) — Log diameter (inches)
\( L \) — Log length (feet)

Explanation: This formula approximates the International 1/4 rule, accounting for saw kerf and slab loss.

3. Importance of Board Foot Calculation

Details: Accurate board foot estimation helps in log valuation, sawmill production planning, and lumber inventory management.

4. Using the Calculator

Tips: Enter the log diameter in inches and length in feet. Both values must be > 0. The result is an estimate of usable board feet.

5. Frequently Asked Questions (FAQ)

Q1: What is the International 1/4 rule?
A: A log scaling method that accounts for 1/4" saw kerf and assumes 1/4" slabs will be removed from four sides.

Q2: How accurate is this approximation?
A: It provides a reasonable estimate for most softwoods, but actual yield may vary based on sawing method and log quality.

Q3: Should I measure diameter inside or outside bark?
A: Typically measured inside bark at the small end of the log.

Q4: Does this account for log taper?
A: No, this assumes a cylindrical log. For tapered logs, use the average diameter.

Q5: What's the difference between board feet and cubic feet?
A: Board feet is a lumber measurement (1" thickness), while cubic feet is a volume measurement of solid wood.