A concrete slab calculator works by calculating the amount of concrete needed in cubic feet by multiplying together the values in feet for the length, width and depth of the concrete slab. The result is divided by 27 to ... More »

Concrete calculators are available at Calculator.net, ConcreteNetwork.com, CalculatorSoup.com and AdvanceReadyMix.com, as of 2015. These websites provide free software applications that determine an estimated amount of c... More »

Manually calculate concrete amounts in cubic yards for square or rectangular areas by multiplying the length by the width by the depth and dividing by 27. Convert all measurements to the units of feet before calculating.... More »

A slab of concrete that is 8 feet by 8 feet by 16 feet , or 1024 cubic feet, weighs 136,192 pounds of 61,762.44 kilograms if it is pre-mixed. Calculator.net provides a concrete-volume calculating tool. More »

The price per cubic yard of concrete is determined by multiplying the desired finished length, width and depth of the concrete and dividing that number by 27. This depends on the type of concrete being used, how much is ... More »

Multiplying the length, width and depth, converted to yards, of the area in question provides the amount of concrete needed in cubic yards. This formula is applicable for any square or rectangular area, commonly referred... More »

The amount of concrete needed for a 10-by-20-foot slab depends on the thickness of the slab. A 10-by-20-foot slab with a thickness of 4 to 8 inches requires 2.5 to 5 yards of concrete. More »