It is Important to determine gallons in your swimming pool to use the proper amount of chemicals. The formulas below are used to measure gallons:
Length x width x average depth (measure depth at shallow end and depth at deep end, add them together and divide by 2…this is the average depth) x multiplier*.
*The Multiplier for rectangle, square and freeform pools = 7.7.
*The multiplier for round or oval pools is 5.9.
Example: 28 x 14 x 4 x 7.5 = 11,760 gallons for a 14 x 28′ pool, avg. depth 4′.
Example (8′ round spa) =Volume = area x depth (average) x 5.9.
3.14 x 4′ (radius…one half of 8′ diameter) x 4 (the number itself) = 50.24 x 3′ (average depth) x 5.9 = 2,668 gallons for an 8′ circular spa.
See Chart Below for Example for Standard Florida Pool Sizes:
|Pool Size||3.5′ Avg. Depth||4′ Avg. Depth||4.5′ Avg. Depth||5′ Avg. Depth|
|12′ x 24′||7,600||8,600||9,700||10,800|
|14′ x 28′||10,300||11,800||13,200||14,700|
|15′ x 30′||11,800||13,500||15,200||16,900|
|16′ x 30′||13,400||15,400||17,300||19,200|
Pool Chemistry Chart: (Ideal Readings)