Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Total board feet
48.00
Lumber cost
$312
Board feet per board
4.00
Total linear feet
96
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter thickness (in).
- 2Enter width (in).
- 3Enter length (ft).
- 4Enter number of boards.
- 5Enter price per board foot ($).
- 6Read your total board feet on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
Hardwood is sold by the board foot — 144 cubic inches of wood. Rough lumber is measured before surfacing, so a 4/4 board that arrives at 13/16 inch still bills as a full inch.
Worked example
Using the values the calculator loads with:
Inputs
- Thickness: 1 in
- Width: 6 in
- Length: 8 ft
- Number of boards: 12
- Price per board foot: 6.5 $
Results
- Total board feet: 48
- Lumber cost: $312.00
- Board feet per board: 4
- Total linear feet: 96
What each field means
Inputs
- Thickness (in)
- The thickness used in the calculation, measured in in. Starts at 1 in so you have a working example on load.
- Width (in)
- The width used in the calculation, measured in in. Starts at 6 in so you have a working example on load.
- Length (ft)
- The length used in the calculation, measured in ft. Starts at 8 ft so you have a working example on load.
- Number of boards
- The number of boards used in the calculation. Starts at 12 so you have a working example on load.
- Price per board foot ($)
- The price per board foot used in the calculation, measured in $. Starts at 6.5 $ so you have a working example on load.
Results
- Total board feet
- Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Lumber cost
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Board feet per board
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total linear feet
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the board foot calculator work?
Hardwood is sold by the board foot — 144 cubic inches of wood. Rough lumber is measured before surfacing, so a 4/4 board that arrives at 13/16 inch still bills as a full inch. The underlying maths is: Board feet = Thickness (in) × Width (in) × Length (ft) ÷ 12 × Quantity.
What do I need to enter?
5 values: thickness, width, length, number of boards, and price per board foot. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the total board feet result mean?
It is returned as a decimal number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Estimates assume standard, average conditions — local rules, pricing, and materials vary.
Who is this tool for?
It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Board Foot Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/lumber
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/lumber" target="_blank" rel="noopener">Board Foot Calculator — RevenueLab</a> (2026).</p>
Source: [Board Foot Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/lumber) (2026).