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To calculate the volume of concrete you need, you must measure the surface area of the slab and multiply this by the thickness of the slab. You usually measure the length and width of the slab in feet, thus giving you a value for area in square feet when you multiply them, but you usually measure thickness in inches.
If you want to know how many cubic yards of concrete you need to pour then simply enter in the desired depth in inches, width in inches (or the diameter if round), the length in inches (which you can leave blank if round), and then press calculate.et's be honest-sometimes the best concrete footing calculator is the one that is easy to use and doesn't require us to even know what the concrete footing formula is in the first place! But if you want to know the exact formula for calculating concrete footing then please check out the Formula box above.