Free Lumber Board Foot Calculator for Thickness, Width, Length, Quantity, Waste, Volume, and Cost
Use this browser-side calculator to turn measurements and product assumptions into a practical first-pass estimate. Review the formula, replace defaults with real project data, and verify requirements before purchasing or building.
Use the calculator
How to use this calculator
1. Measure consistently
Use the units shown beside each field and recheck the dimensions that drive the calculation.
2. Replace defaults
Use actual package coverage, spacing, waste, price, product dimensions, or project ratios whenever they are known.
3. Verify before ordering
Compare the result with drawings, manufacturer data, supplier units, site conditions, and applicable requirements.
12 useful features
Thickness input
Built into this calculator for a clearer planning workflow.
Width input
Built into this calculator for a clearer planning workflow.
Board length
Built into this calculator for a clearer planning workflow.
Quantity
Built into this calculator for a clearer planning workflow.
Board feet per piece
Built into this calculator for a clearer planning workflow.
Total board feet
Built into this calculator for a clearer planning workflow.
Waste allowance
Built into this calculator for a clearer planning workflow.
Cubic-foot conversion
Built into this calculator for a clearer planning workflow.
Price per board foot
Built into this calculator for a clearer planning workflow.
Total cost
Built into this calculator for a clearer planning workflow.
Local history
Built into this calculator for a clearer planning workflow.
Copy/download/print/reset
Built into this calculator for a clearer planning workflow.
Formula and reference table
| Concept | Formula / meaning | Planning note |
|---|---|---|
| Board feet per piece | thickness(in) × width(in) × length(ft) ÷ 12 | Standard board-foot formula |
| Raw total | board feet per piece × quantity | Before waste |
| Order volume | raw board feet × waste factor | Planning allowance |
| Cubic feet | board feet ÷ 12 | 12 board feet = 1 cubic foot |
Pre-order checklist
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Quick knowledge check
What is the safest way to use a construction calculator?
Microlearning guide
Geometry is one layer
A correct area, volume, spacing, or slope formula does not replace structural, product, installation, or code requirements.
Whole units matter
Sheets, bags, boards, rolls, bundles, and stock pieces are purchased as discrete units, so planning often requires rounding upward.
Assumptions drive results
Waste, spacing, product coverage, price, pitch, dimensions, or layout choices can change an estimate more than extra decimal places.
Examples and practical uses
Early planning
Compare quantity or cost scenarios before requesting material quotes.
Purchase cross-check
Compare the result with package coverage, stock lengths, supplier recommendations, and project drawings.
Formula review
Use the reference table to independently reproduce the main arithmetic.
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Frequently asked questions
What is one board foot?
One board foot is a lumber volume of 144 cubic inches, commonly represented as 1 inch thick by 12 inches wide by 12 inches long.
Should I use nominal or actual dimensions?
Use the dimensions that match how your supplier prices or reports the lumber. Nominal and surfaced dimensions can differ.
Why add waste?
Defects, grain selection, trimming, kerf, matching, and cut-list inefficiency can increase purchased volume beyond finished-part volume.
Can this price lumber?
Yes, if your supplier quotes a price per board foot. Enter that price to estimate the volume-based material cost.
Does this optimize a cut list?
No. It calculates lumber volume, not part nesting or cutting optimization.