Calculating the number of gallons in your natural pond

The most important information you should know about your pond is the number of gallons of water it holds. Correct filter sizing and water treatments are based on this number.  A natural pond is a bit harder to calculate than a rectangular or circular pond but many of us want a pond that looks natural so its a necessary calculation. You can empty your pond and measure how much water it takes to refill it but most of us would rather not have to take this route when a calculation is available.

There are 7.48 gallons of water per cubic foot.

To figure gallons in your pond: (All measurements are in feet)

Natural Ponds: Length x Width x .8 x Depth x 7.5 = Gallons 

(.8 compensates for lack of corners. Use .85 for ponds 400 plus square feet)