What this calculator does
Board feet of lumber works out board feet and cost for a batch of dimensional lumber. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaBoard feet = length (ft) × width (in) × thickness (in) / 12
The inputs explained
| Field | What to enter |
|---|---|
| Thickness (in) | A number, measured in in. Starts at 1. |
| Width (in) | A number, measured in in. Starts at 6. |
| Length (ft) | A number, measured in ft. Starts at 8. |
| Number of pieces | A number. Starts at 10. |
| Price per board foot ($) | A number, measured in your currency. Starts at 4.5. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with thickness
Every other input is held at the calculator’s starting values while thickness varies. Select any row to load that scenario into the calculator.