A supplier quote lists two lumber groups and a price of 8.40 per board foot. The buyer wants to reproduce the stated extension before asking about a difference. This example selects supplier-billed dimensions and copies the document’s values literally. It checks volume and multiplication only; it does not know the currency’s purchasing power, current market prices, grade, tax, delivery, or contractual terms.
Reproduce the billed rows
Select imperial units and supplier-billed dimensions. Enter “4/4 cherry” as 1 inch thick, 10 inches wide, 8 feet long, quantity 5. Enter “5/4 cherry” as 1.25 inches thick, 8 inches wide, 10 feet long, quantity 2. The labels preserve the quote wording but do not change thickness. Enter 8.40 in the optional price-per-board-foot field and keep the quote’s currency label. Exclude its separate delivery charge and tax from this unit-price calculation.
Calculate the stated extension
The first row is 1 × 10 × 8 × 5 ÷ 12 = 33 1/3 board feet. The second is 1.25 × 8 × 10 × 2 ÷ 12 = 16 2/3. Together they equal exactly 50 board feet. At the entered price, 50 × 8.40 gives 420.00 in the user’s currency. The row display may round thirds to three decimals, but the aggregate and cost use exact internal values, so the two repeating fractions combine before currency rounding.
Explain any remaining difference
If the quote’s lumber extension is not 420.00, compare its board-foot total, price, and rounding method first. Then ask whether 4/4 and 5/4 represent different billed thicknesses, whether lengths are rounded upward, or whether a minimum applies. Reconcile delivery, tax, discounts, and grading premiums as separate lines. Even an exact 420.00 match means only that these entered dimensions and price reproduce that arithmetic. It does not confirm delivered dimensions, quality, quantity received, or fairness. Save the source quote; copy the browser tally before closing because LumberCalc stores no history.