Lumber Conversion Calculator
Convert between different units of lumber measurement.
The world of lumber has many different units of measurement, which can be confusing. The same amount of wood can be described in board feet, cubic meters, or even linear feet of a specific dimension. This calculator is a handy utility for converting between these common units.
Whether you're working with plans from a different country, trying to compare prices from suppliers who use different units, or converting a volume to a specific board size, this tool ensures your conversions are fast and accurate.
Lumber volume is the same wood seen through different rulers. The tool multiplies your number by a stored factor to restate it.
- Know your anchor: One board foot (BF) is 144 cubic inches — a 12″ × 12″ × 1″ piece. One cubic meter is about 423.77 BF.
- Enter the value: Type the quantity you already have.
- Pick source and target units: Choose what you are converting from (BF, cubic meters, cubic inches, or linear feet of 1×12) and what you want back.
Result = Value × (Target units per Source unit) - Sanity-check the direction: Going BF → cubic meters should shrink the number (× 0.00236); cubic meters → BF should explode it (× 423.77).
The “Linear Foot (1×12)” option only holds for a 12-inch-wide, 1-inch-thick board, where one linear foot genuinely equals one board foot. For any other width, convert volume and re-derive length yourself.
Example 1: Comparing a metric supplier quote.
A mill offers 2 m³ of walnut. Convert to the unit you budget in: 2 × 423.77 ≈ 848 BF. At $6/BF delivered, that's roughly a $5,000 purchase — a number you can actually weigh against a domestic board-foot price.
Example 2: Board feet to linear feet of 1×8.
You have 60 BF and want 1×8 stock. One linear foot of 1×8 is 8/12 = 0.667 BF, so 60 ÷ 0.667 ≈ 90 linear feet. The tool's 1×12 preset gives 60 linear feet; adjust for the narrower board yourself.
Example 3: Volume to cubic inches for a turning blank.
A 5 BF blank is 5 × 144 = 720 cubic inches — handy when a glue-up or shipping box is sized in inches.
- Treating linear feet as universal: The 1×12 preset assumes a 12″-wide board. A 1×6 or 2×10 has a very different board-foot-per-linear-foot ratio.
- Nominal vs. actual: Pricing hardwood on nominal sizes overstates BF. Mill and dry dimensions are smaller; measure the actual thickness and width.
- Inverting the factor: Multiplying board feet by 423.77 to reach cubic meters. BF → m³ means dividing by ~423.77 (or × 0.00236).
- Rounding early on small volumes: Cubic-meter figures carry a lot of board feet; keep decimals until the final price or you can lose dozens of BF.
"Conversions only help when you and the seller agree on the basis. Before I price imported stock, I confirm whether their cubic meters are green, air-dried, or kiln-dried volume — the same cubic meter of wood can carry very different usable board feet." — Lumber Yard Manager
"When a deal is quoted by the unit you don't think in, convert it into the unit you buy in — usually board feet or linear feet at the yard — before you compare prices. Matching units is how you spot a bargain that isn't one."
- Price comparison: Put a $/m³ import and a $/BF domestic lot on the same footing.
- Plan translation: Turn a metric bill of materials into the board feet you order.
- Inventory math: Restate a volume of offcuts in cubic inches for storage or shipping.
- Estimating: Convert a takeoff's board feet into linear feet of a given width for a cut list.
- Board Foot: The standard unit of lumber volume in North America, equal to 144 cubic inches (a board 12" x 12" x 1" thick).
- Cubic Meter: The standard unit of lumber volume in most of the world (the SI unit).
- Linear Foot: A measure of length only. When used for lumber, it must be tied to a specific dimension (e.g., a "linear foot of 1x12").
- Nominal vs. Actual: Nominal is the trade name (2×4); actual is the true milled size (1.5″ × 3.5″). Board-foot math should use actual sizes for hardwood.
How we calculate & sources
Formulas follow accepted woodworking practice and cited building-code / industry standards. Results are estimates — always verify against your own material and local code.
- Wood Handbook — Wood as an Engineering Material (USDA Forest Service)
- International Residential Code (IRC), Span Tables
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- Lumber Cost Calculator
- Wood Shrinkage Calculator
- Plywood Sheet Calculator
- Room Square Footage
- Material Waste Calculator
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- Wood Grain Direction
- Veneer Coverage Calculator
- Thickness Planer Calculator
- Hardwood Lumber Board Footage Calculator
- Softwood Lumber Board Footage Calculator
- Trim and Molding Calculator
Always double-check your measurements before cutting.
Account for the kerf (the width of the saw blade) in your calculations.
Consider wood movement (expansion and contraction) in your final dimensions.
Buy 10-15% extra material to account for mistakes and waste.
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