Home / Pool Gallons Calculator
How many gallons in my pool? This pool volume calculator does the math: pick the shape, enter your measurements in feet, and get the gallons.
This pool gallons calculator works from pool volume: length times width times average depth, times a number that turns cubic feet into gallons for your shape.
Rectangle or square: length × width × average depth × 7.5
Round: diameter × diameter × average depth × 5.9
Oval: length × width × average depth × 5.9
Kidney or freeform: treat it as a rectangle using the longest length and an average width, then take about 85 percent. Freeform pools vary, so this is an estimate.
Average depth is the shallow end plus the deep end, divided by two. For an above-ground pool, enter the same water depth in both boxes.
That number is what we need to quote a fill. Once you have it, send it with the quote form or call. Rough is fine; Ronnie turns dimensions into gallons every day and will confirm it with you.
Gallons are most of what sets the price of a pool water delivery, and they are also the reason a hose fill takes so long. A garden hose moves only a few gallons a minute, so a pool in the tens of thousands of gallons can mean the better part of a week of running water. On a private well, that is days of your pump running nonstop. A tanker delivers the same water in an afternoon. Here is how a delivery works, and here is where we deliver.
Multiply length by width by average depth (all in feet), then by 7.5 for a rectangle. For a round pool, use diameter times diameter times average depth times 5.9. For an oval, length times width times average depth times 5.9. The calculator above does the math for you.
Add the shallow-end depth and the deep-end depth and divide by two. A pool that runs 3 feet to 8 feet has an average depth of 5.5 feet. For an above-ground pool, use the water depth, usually a few inches below the wall height.
Above-ground round pools often hold a few thousand to around 15,000 gallons. In-ground residential pools commonly run 10,000 to 25,000 gallons or more. Your own measurements are always better than an average.
Divide your gallons by your hose flow. A garden hose commonly runs somewhere around 5 to 10 gallons a minute depending on water pressure, so a 20,000 gallon pool works out to roughly 33 to 67 hours of nonstop running, and longer on a weak well. A tanker delivery gets the same pool full in an afternoon.
No. A close estimate is fine. Call (410) 714-8786 with the number from this calculator, or just your measurements, and RKD will confirm it on the phone.
