Cost Per Board Foot Calculator
Two lumber quotes can both sound reasonable and still be $40 apart on the same pile of wood, because yards price by the board foot while buyers think in boards. This calculator runs the division in the direction quotes hide: total cost divided by total board feet, so you see the unit price you actually paid.
It is deliberately the reverse of a board foot volume calculator. If you need the board feet in a stack from its dimensions first, work that out, then bring the total here with the invoice price to get the one number that makes two quotes comparable.
How it was calculated
One division, done exactly as the yard does it in reverse. The result is shown to four decimal places so small piles and pricey species do not get rounded into a tie.
Quick Answer
Key takeaways
- This tool prices lumber; it does not measure it. Volume from dimensions lives on the board calculator, unit price from totals lives here, and confusing the two produces nonsense quotes.
- Always compare yards on the same basis: same species, same grade, same tally method, and the same answer to whether tax and delivery are inside the total.
- Nominal and actual sizes change the board foot count, not the formula. A quote priced on nominal dimensions carries more board feet than the wood you can measure.
- Four decimal places matter on small piles: on 12 board feet, the difference between $8.00 and $8.33 per BF is real money by the third board.
- Quick Answer
- How to use the cost per board foot calculator
- Two formulas that meet in the middle
- Worked example: a $960 walnut and maple buy
- The example the old version of this page got wrong
- What a fair price per board foot looks like
- Nominal size, actual size, and the count you pay for
- What competing calculators miss
- Frequently Asked Questions
- Add This Calculator to Your Website
- References
How to use the cost per board foot calculator
Enter the total cost of the buy and the total board feet it contains, then press Calculate. The board feet figure comes from the yard tally on your invoice, from the seller listing, or from your own measurement: thickness in inches, times width in inches, times length in feet, divided by 12, per board, added across the pile.
If you do not have the board feet yet, get them first with the board calculator, which works forward from dimensions, waste allowance, and piece counts to total board feet and project cost at a price you supply. This page starts where that one ends: the pile and the invoice both exist, and the open question is the unit price hiding inside them. Run every competing quote through the same two fields and the cheapest yard stops being a matter of opinion. For a project priced as a whole rather than by the pile, a fence is the classic case: the cedar fence cost calculator builds the full installed figure, posts, rails, and pickets included.
Two formulas that meet in the middle
Board foot pricing is a round trip. The yard multiplies volume by a unit price to reach your total; this calculator divides the total by the volume to recover that unit price.
The definition is old and stable: Fine Woodworking describes the board foot as the lumberyard unit of volume, 144 cubic inches, precisely because hardwood arrives in random widths and lengths that piece pricing cannot handle fairly. A wide board and a narrow board of the same length hold different amounts of wood, and the board foot is what keeps the price proportional to the material.
Worked example: a $960 walnut and maple buy
The calculator is pre-filled with this case: a mixed pile invoiced at $960 for 120 board feet on the tally.
| Step | Numbers | Result |
|---|---|---|
| Unit price | $960 / 120 BF | $8.0000 per BF |
| Quoting round figure | Two decimals | $8.00 per BF |
| Rate scaled up | $8.00 x 100 BF | $800 per 100 BF |
| Rival yard A | $1,080 / 120 BF | $9.00 per BF |
| Rival yard B | $850 / 100 BF | $8.50 per BF |
The rivals show why the unit price, not the invoice total, is the comparison. Yard B has the smallest invoice and still is not the cheapest wood: at $8.50 per BF it beats yard A by 50 cents and loses to the pre-filled buy by 50 cents, and on a 400 board foot project those gaps are worth $200 either way. The same discipline scales up to whole builds, where lumber is one line inside the build cost per square foot calculator view of a project.
The example the old version of this page got wrong
An earlier version of this article illustrated the tool with 10 boards, each 8 feet long, 6 inches wide, and 2 inches thick, and claimed each board held 0.6667 board feet. That mixed feet and inches in one formula and shrunk the pile twelvefold. Done consistently, each board is 2 x 6 x 8 / 12 = 8 board feet, the pile is 80 board feet, and $100 for that pile is $1.25 per board foot, not $15.00. The trap is worth remembering because it is the most common board foot error in the wild: pick one length unit, feet with a divisor of 12 or inches with a divisor of 144, and never blend them.
What a fair price per board foot looks like
There is no single fair price, because species, grade, thickness, and surfacing move the number more than geography does. These retail ranges, gathered from current lumber pricing guides, are orientation, not a quote.
| Stock | Typical retail range | Reading |
|---|---|---|
| Construction softwood (SPF) | $2 to $5 per BF | Budget band |
| Cedar, pressure-treated pine | $4 to $8 per BF | Mid band |
| Poplar, red oak | $4 to $9 per BF | Domestic hardwood core |
| Hard maple, white oak, cherry | $6 to $14 per BF | Premium domestic |
| Black walnut, figured and exotic stock | $10 to $20+ per BF | Verify carefully |
Thickness quietly multiplies value: 8/4 stock costs more per board foot than 4/4 of the same species because wide, thick, clear boards are scarcer, and rough-sawn stock runs cheaper per board foot than surfaced S4S because the milling, and the roughly 19 to 25% of volume it planes away, has not been paid for yet. Grade does the same work: FAS and Select boards carry a premium over No. 1 Common that no calculator can judge from price alone, which is why two $8.00 quotes are only equal once the grade on the tally matches too.
Nominal size, actual size, and the count you pay for
A 2x4 is not 2 by 4 inches once it leaves the planer; it measures 1.5 by 3.5 inches. Counted nominally, an 8-foot 2x4 holds 5.33 board feet; counted at actual size, 3.5 board feet. Construction lumber is conventionally priced on the nominal count, and hardwood dealers tally the rough dimensions before surfacing, so the board feet you pay for are systematically more than the wood that lands in your project. That is not a scam, it is the trade convention, but it means a unit price computed from actual finished dimensions will always look worse than the yard quote computed their way. Compare like with like: tally basis first, unit price second.
What competing calculators miss
Nearly every board foot tool on the first page of results runs forward: dimensions in, volume and total cost out. That leaves the reverse question, the one buyers with an invoice in hand actually ask, unanswered.
Miss 1: no reverse direction. A forward calculator cannot tell you what you paid per board foot unless you already know the unit price, which is the thing you are trying to find. This tool exists for the invoice-first workflow.
Miss 2: totals compared instead of rates. Quote comparisons done on invoice totals crown whichever pile is smallest. The worked example shows a cheaper invoice hiding a mid-priced rate.
Miss 3: two-decimal rounding. Most dividers round the unit price to cents. On hardwood tallies that rounding can bury a real difference; this tool keeps four decimals, the same precision the live calculation has always reported.
Miss 4: silence on tally traps. Mixed-unit formulas, nominal counts, and rough-versus-surfaced tallies each move the count by more than any rounding. A pricing page that never mentions them leaves its readers defenseless at the yard counter.
Frequently Asked Questions
A board foot is a unit of lumber volume equal to 144 cubic inches: a board 1 inch thick, 12 inches wide, and 1 foot long. Any combination of dimensions holding the same volume is one board foot, which is why the unit fairly prices boards of random width and length.
They run in opposite directions. The board calculator starts from dimensions, thickness, width, length, and piece count, and produces total board feet and a project cost at a unit price you supply. This calculator starts from a finished total, the invoice price and the tally, and recovers the unit price inside it. Measure with one, audit the price with the other.
Per board, multiply thickness in inches by width in inches by length in feet, then divide by 12. If length is in inches too, divide by 144 instead. Add the boards together for the pile total, and add 10 to 15 percent if you are still planning how much to buy rather than pricing what you bought.
Yes, if you want the price you actually paid per board foot, which is the figure worth comparing against a yard that quotes delivered pricing. If you are comparing two bare lumber quotes, leave tax and delivery out of both. The rule is consistency: whatever is inside one total must be inside the other.
It depends on the species and grade. Construction softwoods commonly run $2 to $5 per board foot at retail, mainstream hardwoods like poplar and red oak $4 to $9, hard maple, white oak, and cherry $6 to $14, and black walnut or exotics $10 to $20 and up. A price far outside the band for its species is a reason to check the tally and grade, not an automatic bargain or rip-off.
Usually the tally basis differs: nominal versus actual dimensions, rough versus surfaced measurement, or rounding each board up to the nearest quarter foot. Ask each yard how it tallies, recompute both tallies on the same basis, and only then compare the unit prices this calculator gives you.
Not meaningfully. Sheet goods are priced by the sheet or by the square foot because their thickness is fixed and their volume is not what you are buying. This tool is for solid lumber sold by volume. Divide a sheet price by its square footage for the comparable sheet-goods rate.
It changes your effective cost, not the invoice rate. If 15 percent of a pile ends as offcuts and defects, your cost per usable board foot is the invoice rate divided by 0.85, so $8.00 per BF becomes about $9.41 per usable BF. Price projects on the usable figure and quotes on the invoice figure.
Add This Calculator to Your Website
References
- Fine Woodworking, "What is a board foot and how do you calculate it?": the trade definition, 144 cubic inches, and lumberyard tally practice. Fine Woodworking: What is a board foot. Accessed October 2026.
- Woodshop News, "Measuring up to your expectations": board foot measurement, net versus gross tally after kiln drying, and nominal sizing in retail lumber. Woodshop News: Measuring up to your expectations. Accessed October 2026.
- "Board foot" reference entry: unit conversions, 1 board foot = 1/12 cubic foot = about 2.36 liters, and the MBF thousand-board-foot convention. Board foot: unit definition and conversions. Accessed October 2026.
- ForestSource wood calculators: species constants and methods held against the USDA Forest Products Laboratory Wood Handbook, including board foot formulas in both feet and inches forms. ForestSource: Wood calculators and methods. Accessed October 2026.
- EngineerFix, "How Is Board Feet Measured for Lumber?": the nominal-dimension convention in trade pricing, with worked board foot examples. EngineerFix: How board feet is measured. Accessed October 2026.