How to Calculate the Amount of Water (Volume) in Your Swimming Pool or Spa Square or Rectangular

There is a formula for anything that you need to accomplish with regards to swimming pools, spas and hot tubs. Whether it’s a chemical adjustment or a piece of equipment that you need to replace and you want to be sure it’s the right size.

This article, as is stated in the title, is about finding out how much water is in your pool or spa. You need this number for anything you want to do to or with your pool or spa. From chemical additions to turnover rates, filter rates, water changes, heating, etc.

Formula:

Length x Width x Ave. Depth x 7.48 = Volume in Gallons

                            Or L x W x AD x 7.48 = V

Note: 1 cubic Foot = 7.48 Gallons

Note: Average Depth is found by adding the depth at the deepest and shallowest areas of the pool then dividing by 2.

Ex: a rectangular pool measuring 18’ x 36’ with a 3’ shallow end and a 9’ deep end would be

18 x 36 x 6 x 7.48 = 29,082 gal. It is perfectly acceptable to round this number to 29,000. Anything less than 500 gallons is not going to have a huge impact on a body of water this size.

Article by: Jef Kirchmaier, CPO, CPT, AEA, WQM

                 

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