Board Feet Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
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Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter thickness (inches), width (inches) and length (feet).
- Optionally set the number of boards.
How it works
Board feet = thickness(in) × width(in) × length(ft) ÷ 12, multiplied by the number of boards. One board foot is 144 cubic inches.
Worked example
1 in × 6 in × 8 ft. = 4 board feet.
Common mistakes
- Mixing units — thickness and width are in inches, length is in feet.
- Using nominal sizes (a '1×6' is actually ~¾ × 5½ in dressed timber).
Frequently asked questions
What is a board foot?
A volume of lumber 1 inch thick, 12 inches wide and 1 foot long (144 cubic inches). It's the standard way hardwood is priced.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.