Lumber Calculator
Calculate board feet, determine lumber quantity, and estimate total cost for your project. Perfect for framing, decking, cabinetry, and woodworking projects.
Accurate conversion from linear feet
1x4 through 2x12 standard lumber
Total & per-linear-foot pricing
How to use
- Enter the total linear feet of lumber you need
- Select the lumber size (e.g., 2x4, 1x10)
- Enter the local price per board foot
- Click "Calculate" to see board feet and total cost
- Review recommendations for waste and purchasing
Example scenarios
100 linear ft of 2x10 @ $2.00/BF: 166.5 board feet, 13 pieces, $333 total
50 linear ft of 1x6 @ $1.25/BF: 27.5 board feet, 7 pieces, $34.38 total
40 linear ft of 2x4 @ $1.50/BF: 40 board feet, 5 pieces, $60 total
Frequently asked questions
What are board feet?
Board feet (BF) is the standard unit for lumber volume: (length × width × thickness in inches) ÷ 12.
How do I convert linear feet to board feet?
Multiply linear feet by board feet per linear foot. For 2x4 lumber: 20 ft × 0.667 BF/ft = 13.34 BF.
What standard lengths are available?
Common lengths: 8ft, 10ft, 12ft, 14ft, 16ft. Some suppliers offer custom cuts for additional fees.
Why is lumber priced per board foot?
Board feet standardizes pricing across sizes. Thicker/wider boards cost more per BF than thinner ones.
How much waste should I plan for?
10-15% is typical for cuts and mistakes. This calculator shows scrap from standard lengths; add extra for joinery.
What's the difference between 1x and 2x?
1x lumber (0.75" thick) is for trim and finish. 2x lumber (1.5" thick) is for structural framing and support.
Can I use this for hardwoods?
Yes! Enter your local hardwood price per BF. Hardwoods cost more but the calculation method is identical.
How do I find lumber prices in my area?
Check local suppliers, big-box stores, specialty mills, and online marketplaces. Prices vary by region, species, and availability.