chuck How the calculation works
Packs = required quantity ÷ effective quantity per pack, rounded up. Materials subtotal = packs × pack price. Discount = subtotal × entered percentage, rounded once to the nearest penny. Total = subtotal − discount + delivery.
Use the result with care
Use one unit throughout: for example, square metres on both quantity fields. Effective pack coverage must account for the product and intended use. This totals quantities, not a cutting layout or installation plan. The discount applies to materials only; delivery is added afterwards. Use the same price basis throughout and check the seller’s actual discount terms. No product coverage or discount is supplied by this tool.
Your figures stay in this page
The calculation runs in your browser. These entries are not sent to a calculator service or saved by this tool. Reset returns the form to its starting values.