Above-Ground Pool Volume Calculator
For round or oval above-ground pools -- enter your size and depth to get gallons.
Pool Volume
Use this volume in…
Not sure whether an in-ground or above-ground pool fits your yard and budget? Take the In-Ground vs Above-Ground Pool Finder.
Take the quizWhy above-ground pools use round or oval formulas
Above-ground pools are built as round or oval structures, never true rectangles, so this calculator uses the same diameter/length-and-width times 5.9 formula as the Pool Volume Calculator's round and oval options -- there's no rectangular option here because it wouldn't match any real above-ground pool shape.
Depth is the detail most owners get wrong. Manufacturers list a wall height (commonly 48, 52 or 54 inches), but pools are usually filled a few inches below the top, so a 52-inch pool often holds water at closer to a 48-50 inch average depth. Measure your actual water line with a tape measure for the most accurate volume.
Oval above-ground pools are true ellipses, and the 5.9 multiplier applied to length × width is the same industry approximation used for in-ground oval and kidney-shaped pools.
Where these numbers come from
The formulas and default values in this calculator are based on:
- standard round/oval pool volume formulas (diameter-squared or length-times-width, x average depth x 5.9)
- manufacturer wall-height and typical fill-depth specifications for above-ground pools (commonly 48-54 in wall height)
These are planning estimates. Test your actual water, follow product labels, and check your equipment manufacturer's guidance before you buy or dose chemicals.
Frequently asked questions
Can an above-ground pool be rectangular?
Rectangular above-ground pools do exist but are far less common than round and oval models, since the round wall shape is structurally simpler and cheaper to manufacture. If you have a rectangular above-ground pool, use the main Pool Volume Calculator's rectangular option instead.
Do I need to subtract anything for the pool's frame or ladder?
No -- the frame sits outside the water and a ladder displaces a negligible amount of volume for dosing purposes. This formula already estimates the interior water volume based on the pool's footprint and depth.
My pool is 15 x 30 oval -- how many gallons is that?
At a typical 4 ft average depth: 15 x 30 x 4 x 5.9 = about 10,620 gallons. Enter your own length, width and depth above to get an exact figure for your pool.
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