Lumber Cost Calculator
Estimate the total cost of lumber for a woodworking or construction project by accounting for board feet needed, price per board foot, waste, sales tax, and delivery charges.
About this calculator
The total lumber cost is calculated as: Total Cost = ((boardFeet × wasteFactor × pricePerBoardFoot) × (1 + taxRate / 100)) + deliveryFee. Board feet is the standard unit for pricing dimensional and rough lumber (1 bf = 1 inch thick × 12 inches wide × 12 inches long). The waste factor — typically 1.10 to 1.20 — accounts for offcuts, defects, and milling losses. Multiplying board feet by wasteFactor before pricing ensures you purchase enough material. The tax term (1 + taxRate/100) applies sales tax to the lumber subtotal only, while the delivery fee is added as a flat charge afterward. Accurate project budgeting requires knowing your species price, which can range from under $2/bf for common pine to over $20/bf for figured hardwoods like curly maple or walnut.
How to use
1. Board Feet Needed: 80 bf (calculated from your cut list). 2. Waste Factor: 1.15 (15% overage for defects and offcuts). 3. Price per Board Foot: $6.50 (red oak). 4. Tax Rate: 8%. 5. Delivery Fee: $45. 6. Lumber subtotal = 80 × 1.15 × $6.50 = $598.00. 7. With tax: $598.00 × 1.08 = $645.84. 8. Total = $645.84 + $45.00 = $690.84. 9. Budget approximately $691 for this lumber order.
Frequently asked questions
What waste factor should I use when calculating lumber for a woodworking project?
A 10–15% waste factor (1.10–1.15) is standard for straight-grained, clear lumber with minimal defects. Rough-sawn hardwood with knots, checks, or sapwood may warrant 20–25% (1.20–1.25) because more material must be cut around unusable sections. Complex projects with many small parts or angled cuts also benefit from a higher factor since short offcuts cannot always be reused. When working with expensive figured wood, experienced woodworkers sometimes lay out all parts on paper first to minimize waste before ordering.
How do I calculate board feet needed for a furniture or carpentry project?
Board feet = (thickness in inches × width in inches × length in inches) / 144, or (thickness × width × length in feet) / 12. For each part on your cut list, calculate the board feet required, then sum all parts. Add your waste factor on top of that total. For example, a shelf blank 1 inch thick, 10 inches wide, and 48 inches long = (1 × 10 × 48) / 144 = 3.33 bf. Lumber yards often sell in fixed-length boards, so rounding up to the nearest available length is also required in practice.
Why does lumber price vary so much between wood species?
Lumber price reflects availability, growth rate, log quality, and market demand. Fast-growing species like pine and poplar are abundant and inexpensive, often under $3 per board foot. Slow-growing hardwoods like walnut, cherry, and white oak command $8–15 per board foot because trees take 60–100 years to reach harvestable size. Figured grain patterns (curly, quilted, birdseye) are rare natural anomalies that can push prices to $30–$100 per board foot for premium pieces. Imported exotics like teak or ebony carry additional cost due to transportation and trade regulations. Always check current pricing at your local hardwood dealer, as prices fluctuate with regional availability and global supply chains.