Getting a fairly accurate estimate on your pond's size...meaning it's gallon volume, surface area, and in some cases the volume of water by acre-feet, is very important. We size most aerators and fountains by using these measurements, and many pond treatments such as beneficial bacteria products and chemical applications are dosed according to the pond volume.
To make this calculation easier for you we've created this online pond calculator. Simply enter the length of your pond in feet, the width in feet, and the depth in feet and it will figure out the total gallon volume of the pond.
Surface area (in acres) is also provided, as is the acre-feet, which is another common way to measure the water volume.