Your customers work out what to order without leaving your page. Two lines of HTML, no account, free.
The calculator runs inside a frame on your page, served from bulkmath.com. Your visitor measures, gets tons or yards and a printable ticket, and stays on your site. Nothing they type is sent to us or to you — the arithmetic happens in their browser. Prices and densities are placeholders they can change; if you would like the defaults set to your own products and prices, write to us.
The first line loads the calculator, the third — the small script — tells your page how tall the frame needs to be, so it never shows a scrollbar. Leave the script out and the frame stays at the fixed height in the tag, which is fine on a desktop page and cramped on a phone.
Free for any website that sells or uses these materials. Keep the credit line under the frame. Do not present the calculator as your own product or hide where the numbers come from. We may change or retire a calculator; the credit link always leads to a working one.