About

This site works out how much concrete a pour needs. Every figure on it is arithmetic over the dimensions you enter, so there is no dataset behind the numbers that could go stale or be withdrawn.

Two figures come from outside sources and both are named on every page that uses them: the yield of each bag size, from the manufacturer's data sheet, and the price basis, from an industry average escalated with the U.S. producer price index for ready-mix concrete.

The site is run by one person. If a number here looks wrong, please say so — the whole point of it is being right about arithmetic.