Lumber Calculator

Use this lumber calculator to estimate total board feet and cost for a stack of same-length boards. Enter the number of boards, the length of each board, and your price per board, and the calculator returns total board feet and total cost. It's a quick pricing tool for framing, decking substructure, and general carpentry stock priced by the piece.

How to use this calculator.

1. Enter number of boards. The total piece count for this line item.
2. Enter board length. The length of each board in feet. Use one length per calculation; run it again for a different length.
3. Enter price per board. Your supplier's per-board price for this size and length.
4. Review your results. Total board feet and total cost update instantly.
5. Repeat for each board size. Since this calculator handles one board length at a time, run it separately for each dimension in your material list and add the totals together.
6. Add your waste factor last. Once you have a combined material total, pad it 10–15% before placing the order rather than inflating each individual line item.

How do you calculate A lumber calculator helps you estimate the total board feet and cost of lumber needed for your project. It uses board count, length, and price per board to give you a quick material estimate.?

This calculator uses a simplified board-foot model: every board is treated as equivalent to a 1×12 (1 linear foot = 1 board foot), so total board feet is simply the board count times the length in feet. It's built for quick pricing comparisons, not for converting odd dimensional lumber sizes.

Total Board Feet = Board Count × Board Length

Total Cost = Total Board Feet × Price per Board

Where:

• Board Count: the number of boards of one size and length.
• Board Length: the length of each board, in feet.
• Price per Board: your supplier's quoted price for one board of that size and length.
• If your lumber isn't sized like a 1×12, convert first using the standard board-foot formula: (thickness in. × width in. × length ft) ÷ 12.

For example, a 2×6 board is 2 board feet per linear foot (2 × 6 ÷ 12), not 1. If you're pricing 2×6 stock, either use the standard board-foot formula to get a true total, or price it per-board as this calculator does and skip the board-foot conversion entirely.

Example calculation.

Scenario: 20 boards, each 8 ft long, at $8.50 per board.

1. Total board feet: 20 × 8 = 160 board feet.
2. Total cost: 160 × $8.50 = $1,360.00.

Result: this order totals 160 board feet for an estimated$1,360.00.

Adding a second size: if the same job also needs 15 pieces of 10-ft stock at $11.25 per board, run the calculator again: 15 × 10 = 150 board feet, 150 × $11.25 = $1,687.50. Combined material cost for both board sizes: $1,360.00 + $1,687.50 = $3,047.50.

Tips from the field.

• Add 10-15% for waste. Cutoffs, warped boards, and defects eat into your usable material on any framing or trim job.
• Price is per board here, not per board foot or MBF. Convert your supplier's thousand-board-foot (MBF) pricing to a per-board price before entering it.
• Nominal vs. actual size matters. A "2×4" measures 1.5×3.5 inches actual — use nominal dimensions when converting to true board feet.
• Run it once per board size. This simplified calculator assumes uniform 1×12-equivalent stock, so calculate each distinct dimension in your list separately and total them up.
• Check for volume discounts. Many yards break pricing at 500 or 1,000 board feet.
• Watch lumber market swings. Framing lumber prices can move sharply month to month with mill output and demand — get a fresh quote before finalizing a budget on anything but a short timeline.

Disclaimer: This calculator provides estimates for planning purposes only. Lumber prices fluctuate with market conditions and vary by region, grade, and species. Always verify current prices with your supplier before placing an order. PavementCalculator.com assumes no liability for cost overages or shortfalls.