A supplier quote may show board dimensions, a board-foot total, a unit price, and an extended cost. Repeating that multiplication is useful, but it answers only an arithmetic question. A different result may come from dimensions, rounding, minimum charges, grading, or another commercial convention. LumberCalc accepts a price supplied by the user; it does not fetch market prices or decide whether a quote is fair.

Copy the quote inputs without reinterpretation

Choose supplier-billed dimensions and enter every quoted group as a separate row. Preserve thickness, width, length, quantity, and units exactly enough to compare with the document. Put species or grade in the optional label for orientation, not as a calculation rule. Enter the quoted price per board foot in the secondary cost section and retain its currency label. Do not combine taxes, delivery, discounts, or fixed fees into the unit price unless the quote explicitly defines that treatment.

Check volume and multiplication separately

First confirm the board-foot total: normalize each imperial row to cubic inches, multiply by quantity, add the exact row volumes, and divide by 144 in³ per board foot. Then multiply the exact aggregate board feet by the entered price. LumberCalc rounds the displayed volume to three decimal places and cost to two only after aggregation. Compare both the unrounded method and the supplier’s stated rounding point; rounding every board or row can produce a different extended amount from rounding once at the end.

Investigate a difference instead of declaring a verdict

If totals differ, compare quantities, units, dimensions, and basis row by row. Ask whether the supplier uses nominal or rough thickness, rounds length upward, applies a minimum tally, or separates grades at different prices. Fixed services and tax should be reconciled outside the board-foot multiplication. A matching total proves only that your entered values reproduce the arithmetic; it does not validate grade, moisture, delivery, market price, or legal terms. Keep the original quote and ask the supplier to explain any commercial rule you cannot reproduce.