Every pool chemical label says “add X per 10,000 gallons,” but do you actually know your pool’s volume? Enter your pool shape and dimensions here. Works for rectangular, round, and oval pools.
Pool Shape & Dimensions
ft
ft
ft
Rectangle
Scenario: Your rectangular pool is 30 ft long, 15 ft wide, with an average depth of 5.5 ft.
Result: Volume: 30 x 15 x 5.5 = 2,475 cu ft. At 7.48 gallons per cubic foot, that's 18,513 gallons.
Round
Scenario: Your round above-ground pool is 18 ft in diameter with a 4 ft depth.
Result: Volume: pi x 9 x 9 x 4 = 1,017.9 cu ft. At 7.48 gallons per cubic foot, that's 7,614 gallons.
Oval
Scenario: Your oval pool has a 24 ft long axis, 12 ft short axis, and an average depth of 5 ft.
Result: Volume: pi x 12 x 6 x 5 = 1,131.0 cu ft. At 7.48 gallons per cubic foot, that's 8,460 gallons.
For rectangular pools: length x width x average depth x 7.48 = gallons. For round pools: diameter x diameter x depth x 5.9 = gallons. Average depth = (shallow end + deep end) / 2.
Pool chemical dosing, heater sizing, pump sizing, and filter sizing all depend on the pool volume. Adding the wrong amount of chlorine, shock, or pH adjuster can damage the pool surface or be ineffective.
Add the shallow end depth and the deep end depth, then divide by 2. If your pool is 3 ft at the shallow end and 8 ft at the deep end, the average depth is 5.5 ft. For pools with a flat bottom, use the actual depth.
There are 7.48 gallons in one cubic foot of water. So if your pool is 2,000 cubic feet, it holds 14,960 gallons.
Want to learn more before you start your project?
Read the full guide →
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