Lumber Calculator
Estimate the amount of lumber needed for your construction or woodworking project. Calculate board feet and total cost with ease.
Measurement System
Switch units without changing the underlying calculation.
Input Dimensions
Calculation Results
Planning estimate only
Results are based on the values and assumptions entered here. Confirm quantities with current product information and suppliers; use qualified local professionals for structural, safety-critical, permitted, or code-regulated work.
Read the calculator terms and limits →Plan before you order
Compare materials for this project
Review the relevant material options, installation tradeoffs, and buying checks before treating this calculator estimate as an order quantity.
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Read the comparison →Pressure-Treated vs Cedar Lumber: Cost, Durability, and Use
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Read the comparison →How to Use the Lumber Calculator
Our lumber calculator is a versatile tool for woodworkers, contractors, and DIY enthusiasts. To calculate board feet, enter the length, width, and thickness of your boards.
If you're buying a large quantity, enter the price per board foot or per cubic meter for a total project cost estimate. Click "Calculate Now" to see the total volume and the projected cost for your lumber order.
Pro Tips for Woodworking and Building
Nominal vs. Actual Size
Remember that a "2x4" board isn't actually 2x4 inches. It's usually 1.5x3.5 inches. Always use the actual measured size in the calculator for the most accurate results.
Factor in Kerf Waste
When cutting boards, each saw cut removes a small amount of wood (the kerf). Add 5-10% to your total order to account for this lost material and potential mistakes.
Frequently Asked Questions
What is a board foot?
A board foot is a specialized unit of volume for lumber. It is equal to a board that is 12 inches long, 12 inches wide, and 1 inch thick (totaling 144 cubic inches of wood).
How do I calculate board feet for multiple boards?
Calculate the board feet for one board using the standard formula, then simply multiply by the total number of boards in your order. Our calculator handles the unit conversions for you.
Why is lumber sold by the board foot?
Board foot pricing provides a consistent way to value wood regardless of its specific width or length, which is particularly useful for hardwoods and rough-sawn timber where sizes vary.