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To calculate the amount of concrete needed for a trapezoidal footing, you need to know the length, width and depth of the footing, as well as the specific weight of the concrete you are using. Once you have these measurements, use the following formula:
Concrete Quantity (in cubic yards) = Length × Width × Depth × Weight / 27
For example, if the length of the footing is 10 feet, the width is 6 feet, the depth is 1 foot, and the weight of the concrete is 140 pounds per cubic foot, the calculation would be as follows:
10 × 6 × 1 × 140 / 27 = 51.85 cubic yards of concrete.