I developed the MMC Concrete Quantity & Cost Calculator after looking around online and noticing that the free concrete calculators available definitely could be improved upon. The advantages of the MMC Calculator include: it can be freely, instantly and securely downloaded to your desktop for your use whenever you need it. It calculates quantities in U.S. units and Metric units. It also provides an estimated concrete cost for both ready-mix and pre-mix concrete. How handy is that?