The Concrete by 40lb Bag calculator computes the number of 40 pound bags of concrete and water needed to mix a volume (V) of concrete.
INSTRUCTIONS: Choose your preferred volume units and enter the following:
40 lb Bags: The calculator returns the number of 40 lb bags needed, and the water requirement for the concrete mix. The water is returned in gallons. However this can be automatically converted to compatible units via the pull-down menu.
Note: this is a random survey of concrete prices on the Internet. The most common prices are found on the websites of major DIY retailers including Home Depot, Lowe's and Menards.