Why the pack price can mislead
Suppose you need 250 square feet of coverage. Supplier A sells an 80-square-foot pack for $34. You need four packs, costing $136 before tax. Supplier B sells a 120-square-foot pack for $44, so you need three packs, costing $132 before tax. At 7% tax, A totals $145.52 and B totals $141.24 before any delivery charge. Add B’s hypothetical $20 delivery fee and its total becomes $161.24. Supplier A has the cheaper pack, but B is cheaper before delivery because fewer packs are needed. The delivery fee reverses that result. Enter your actual takeoff and both quotes to see the difference.
Measure first, then price the exact product
- Use a relevant material calculator to get a takeoff, including any allowance for cuts or waste that fits your job.
- Check the manufacturer’s stated coverage for the exact pack or product. The same nominal bag or board size can produce a different usable quantity.
- Record the price, order minimum, delivery fee and local tax on the same date. Confirm whether the quote includes pickup, unloading or a return fee.
- Check whether the product meets your project needs. Compare material specifications and availability before treating the lower total as the better purchase.
For a multi-material project, repeat this calculation for each line item and use the complete materials checklist to capture accessories and unpriced costs. A blank estimate is a reminder to get a real quote, not a zero-dollar item.
Calculation and limits
Packs to buy = max(round up(required quantity ÷ quantity per pack), minimum packs). Quantity purchased = packs × quantity per pack. Total = packs × price per pack × (1 + entered sales-tax rate) + delivery fee. Sales tax is applied to material packs only; local rules may also tax delivery or use a different rate. The tool assumes one material, one unit and one order from each supplier. Prices and product coverage are visitor inputs; this page does not fetch live store data. Last reviewed 24 September 2026.