How to measure the water capacity of your pond

All you need is a calculator, paper, a pencil and one of these formulas. It’s important to know the water capacity of your pond so you add the right amount of treatments.

Square/Rectangular Ponds:

U.S. Gallons: multiply length x width x average water depth in feet  x 7.5
Example: 8' x 4' x 2' x 7.5 = 480 gal.

Liters: multiply length x width x average water depth in meters x 1000
Example: 2.44m x 1.22m x .61m x 1000 = 1800 L

Round Ponds

U.S. Gallons: multiply diameter x itself x average water depth in feet x 5.9
Example: 4' x 4' x 2' x 5.9 = 190 gal.

Liters: multiply diameter x itself x average water depth in meters x 790
Example: 1.22m x 1.22m x .61m x 790 = 700 L

Irregularly Shaped Ponds

U.S. Gallons: multiply long diameter x short diameter x average water depth in feet x 5.9
Example: 8’ x 4’ x 2’ x 5.9 = 380 gal.

Liters: multiply long diameter x short diameter x average water depth in meters x 790
Example: 2.44m x 1.22m x .61m x 790 = 1400 L

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