Invoice check
Why Does the Yard Charge for More Board Feet Than I Measured?
Your tape says 90 board feet; the invoice says 104. Before you assume you're being cheated — most of the time you're not. Once you know how to calculate board feet the way a mill does, the gap usually makes sense. There are three legitimate reasons the seller's number runs higher, plus a few cases that genuinely deserve a question.
Reason 1: Did you measure surfaced while they tallied rough?
Rough hardwood is tallied at the size it came off the saw. By the time it's surfaced (planed smooth), it's thinner and narrower — but you pay for the rough board, because that's what the mill cut and dried. The gap between the two is exactly the subject of gross tally vs net tally.
On a typical FAS walnut board that left the mill at about 1-1/16″ and 7-1/4″ wide, the yard bills the rough call. After S2S you might hold 13/16″ × 6-7/8″. Your tape on the finished face understates the invoice every time if you ignore the rough basis.
Reason 2: Is quarter-inch thickness rounding inflating it?
Hardwood thickness is called in quarters and a board priced as 4/4 (one inch) is billed at a full inch even if it surfaces to 13/16″. Step up to 5/4 or 6/4 and the billed thickness jumps in quarter steps. That rounding always rounds toward the seller's quarter, never yours. The hardwood thickness guide shows how each quarter maps to what you actually plane to.
| What you measure | Yard thickness call | Billed BF (approx.) |
|---|---|---|
| 0.82″ surfaced | 4/4 (1.00″) | 5.33 |
| 1.05″ rough | 5/4 (1.25″) | 6.67 |
| 1.40″ rough | 6/4 (1.50″) | 8.00 |
Reason 3: How does surface-measure footage rounding add up?
Under NHLA grading, each board's surface measure is rounded to the nearest whole foot before pricing. Across a big pack of boards, those half-foot round-ups add a few board feet. On a 200-board walnut pack I bought last year, footage rounding alone added maybe 5 BF over my own tape total — a rough estimate, but real money at $13 a foot. It's standardized, not arbitrary, and it's why your raw tape total reads low.
What does a fair gap look like in dollars?
I treat a 6–10% gap between my surfaced tape and a disclosed rough/surface-measure invoice as normal on random-width hardwood. Example: I measure 90 BF on the finished faces; the invoice shows 100 BF at $12/BF. That $120 difference is usually rough size plus rounding — not a scam — if the quote said rough or SM. If the quote said “surfaced” and they still billed rough, that $120 is the conversation.
How do I reconcile three boards before I pay?
Pick three random boards from the pack. For each, write thickness (as the yard called it), width, and length, then run them in the board foot calculator. If your three-board sample lands within about 1 BF of the yard’s line items, the rest of the pack is usually fine. If every sample is 8–12% high with no rough-basis note on the ticket, stop and ask for the pricing basis in writing.
When should you actually push back?
Question the invoice when: the basis wasn't disclosed and the gap is over ~10%; you were quoted "surfaced" pricing but billed rough size; or per-board figures don't reconcile when you spot-check three boards. A fair yard will walk you through their tally line by line. Use the routine in how to buy by the board foot so you catch it at the counter, not at home.
Frequently asked questions
Is it legal for a lumber yard to bill more board feet than the finished size?
Yes, when hardwood is sold rough or by surface measure, the tally is based on the rough board, which is larger than the surfaced size you take home. It is standard industry practice, not overcharging, as long as the basis is disclosed.
How do I check if a lumber invoice is fair?
Ask the pricing basis (nominal, rough, or surfaced), then recalculate a sample of boards on that basis. If your surface-measure tally with quarter rounding matches the invoice within a board foot or two, it is fair. Large unexplained gaps are worth questioning.
Does softwood framing use the same rules?
No. Dimensional softwood is usually sold by the piece or by the linear foot at nominal size, not by hardwood-style surface measure. A 2×4 invoice that looks “high” is almost always a piece-count or length mix-up, not NHLA rounding — see board feet in a 2×4.