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HomeToolsCalculatorsFree Lumber Calculator — Board Feet, Linear Feet & Cost
CalculatorsWood

Free Lumber Calculator — Board Feet, Linear Feet & Cost

Calculate lumber quantities in board feet, linear feet, and cost. Supports hardwood and softwood dimensions. Perfect for woodworkers, carpenters, and DIY projects. Free, no signup.

TA
Tanbir Ahamed·Founder of ToolWise · Software Engineer
Published June 2026Updated August 2026

Interactive Tool Workspace

2 = 2x lumber, 1 = 1x, 0.75 = 4/4 hardwood

Common: $0.50-$2/BF softwood, $3-$15/BF hardwood

Total Board Feet
80.00
8.00 BF per piece
Linear Feet
80.0
8.00 ft per piece
Cubic Meters
0.189
Estimated Total Cost
$480.00

At $6 per board foot. Add 10-20% for waste.

How to Use

  1. 1Enter number of pieces you need.
  2. 2Set thickness in inches (nominal: 1, 2, 3, 4 for dimensional lumber).
  3. 3Set width in inches (nominal).
  4. 4Set length in feet and inches.
  5. 5Optionally enter price per board foot for cost estimate.
  6. 6Read total board feet, linear feet, cubic meters, and cost.

Features

  • ✓Board foot calculation per piece and total
  • ✓Linear foot total
  • ✓Cubic meter equivalent
  • ✓Cost estimation with custom $/BF
  • ✓Softwood vs hardwood preset awareness
  • ✓Mix feet and inches for length
  • ✓Copy results to clipboard
  • ✓Reset button
  • ✓100% client-side, privacy-first
Comprehensive Guide & Reference

Lumber Math: Board Feet, Nominal vs Actual, and Hardwood Pricing

A board foot is a volume measure equal to 144 cubic inches — or a 12" × 12" × 1" board. Hardwood is always priced per board foot; softwood is often priced per linear foot or per piece, but board-foot pricing lets you compare across dimensions fairly.

1. The Board Foot Formula

Board Feet = (Thickness in × Width in × Length in) ÷ 144

A board foot is a volume measure equal to 144 cubic inches — or a 12" × 12" × 1" board. Hardwood is always priced per board foot; softwood is often priced per linear foot or per piece, but board-foot pricing lets you compare across dimensions fairly.

2. Nominal vs Actual Dimensions

2×4
Nominal 2" × 4" → Actual 1.5" × 3.5"
2×6
Nominal 2" × 6" → Actual 1.5" × 5.5"
1×6
Nominal 1" × 6" → Actual 0.75" × 5.5"
4/4 hardwood
Roughly 1" thick before surfacing → 13/16" finished

3. Hardwood Pricing Guide (USD per BF, 2024)

Poplar
$3-5
Red Oak
$5-8
Maple
$6-10
Cherry
$8-15
Walnut
$12-25
Mahogany
$10-20
White Oak
$8-12
SPF (Softwood)
$0.50-2

4. Project Estimation Tips

  • Add waste: 10% rough framing, 15% trim, 20-25% complex projects
  • Buy extra: Running short mid-project costs more than over-buying
  • Check grade stamps: Structural lumber is graded #1, #2, #3, stud
  • Inspect on arrival: Cup, crown, twist, bow — reject warped boards immediately
  • Acclimate: Let hardwood sit in your shop for 1-2 weeks before milling

Conclusion

Done right, the whole operation takes seconds, runs entirely in your browser, and never uploads a byte of your input. For lumber Math: Board Feet, Nominal vs Actual, and Hardwood Pricing — or anywhere a precise, in-browser result beats a heavier install — this tool is the right one.

Frequently Asked Questions

What is a board foot?
A board foot is 144 cubic inches of lumber — equivalent to a 12" × 12" × 1" board. Formula: (Thickness in × Width in × Length in) ÷ 144. Hardwood is sold by the board foot; softwood is often sold by linear foot or piece but board-foot pricing lets you compare suppliers.
What is the difference between nominal and actual lumber dimensions?
A 2×4 is not 2" × 4" — it's actually 1.5" × 3.5". The nominal size is the rough-sawn green dimension before kiln-drying and planing. A 1×6 is actually 0.75" × 5.5". ToolWise computes using nominal dimensions, which is industry standard for board-foot calculations.
How much waste should I add?
For rough carpentry (framing, decking): 10% waste. For finish carpentry and hardwood: 15-20%. For complex projects with many cuts: 20-25%. Always buy extra — running short mid-project costs more than over-buying. Lumber yards typically allow returns of uncut pieces.
Why is hardwood so much more expensive than softwood?
Hardwood trees grow slower (60-120 years for oak vs 25-40 for pine), are denser (more material per board foot), and require longer drying times. Common hardwood prices: poplar $3-5/BF, oak $5-8/BF, maple $6-10/BF, walnut $12-25/BF, cherry $8-15/BF. Softwood SPF framing: $0.50-2/BF.
How do I calculate cost per linear foot?
Cost per linear foot = (Thickness × Width in inches × price per BF) ÷ 12. A 2×6 at $4/BF = (2 × 6 × 4)/12 = $4/linear foot. Linear-foot pricing is common for softwood and construction lumber but hides the actual volume — be cautious when comparing across dimensions.
What is a board-foot calculation example?
A 4/4 (1" thick) × 6" wide × 8' long board = (1 × 6 × 96) / 144 = 4 board feet. Ten of those boards = 40 BF. At $8/BF hardwood pricing = $320. Same calculation in metric: 1 BF ≈ 2.36 liters or 0.00236 m³. ToolWise shows both units.
Should I buy green or kiln-dried lumber?
Green lumber is cheaper but warps as it dries. Kiln-dried (KD) is dimensionally stable and ready for finish work. Furniture, cabinets, and flooring demand KD-15 or KD-20 (15% or 20% moisture content). Framing can use green lumber since structural movement is acceptable.
Is my data private?
Yes. All lumber calculations run in your browser. Your dimensions, quantities, and pricing never leave your device.

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