Calculating Pond Volume

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It is important to know the volume of water in your pond. Knowing the volume of water can help you determine the number of fish the pond can hold. Knowing the volume is most important when calculating partial water changes and using pond maintenance and feeding products. The easiest method to calculate the volume of your pond is to measure the amount of water used to initially fill your pond. Before you fill your pond, for the first time, note the time in seconds it takes to fill a five U.S. gallon bucket with tap water at a constant flow rate from a garden hose. Then, fill the pond at this same constant flow rate, using the garden hose. Record the time (in seconds) that it takes to fill the pond. Then use the following formula to determine the volume of your pond.

Volume of pond (in gallons)		Time required to fill pond (seconds)	x	Volume of bucket (in gallons)
	=
		Time required to fill bucket (seconds)

If the pond is already filled, the volume can be calculated using
one of the following formulas. Then, convert volume to gallons.

Square And Rectangle Ponds

Length x Width x Average Depth (in feet) = Volume of Pond

Example:

9’ L x 6’ W x 2’ D =

A pond volume of 108 cubic feet

Round Ponds

Top Diameter x Bottom Diameter x Height (in feet) x 7.85 = Volume of Pond

Example:

(3’ TD x 3’ BD x 2’ H x 7.85 =

A pond volume of 14.13 cubic feet

Converting Volume to Gallons

Cubic feet (ft-3) x 7.48 = Gallons

Multiply 108 (ft-3) x 7.48 = 807 Gallons.

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