To calculate the volume of a pad you need to know the length, width and depth of the pad.. If you are calculating for more than one similar sized pad add the amount in "# of pads".
Formula used for Pad Volume: length *width * depth
When Ordering Concrete
This concrete calculator will help you in estimating the amount of concrete needed for your project. The amount given as needed, does not include any waste. It is recommended, depending on the job you are doing, to add anywhere from an extra 4% to 10% to your concrete order to make sure you have enough concrete to finish the job. Ask when ordering the concrete. They will be able to give you a good idea of what is needed.