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How many gallons of water are in an above-ground pool?
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Pool People

The Pool People specialize in family fun for everyone! We’ve been providing Central and Northern Wisconsin with a high-quality selection of swimming pools, spas, and pool tables for over 37 years.

How Many Gallons of Water Are in an Above-Ground Pool?

Why would you need to know how many gallons of water are in your above-ground pool? One reason you need to know how many gallons of water your pool holds is to accurately figure out the correct doses of chemicals needed to balance your pool water. You can’t just pour chemicals into your pool willy-nilly. You need to know the exact ratio of chemicals to water for proper sanitizing and water-balancing purposes. How do you figure that out, though? The Pool People is here to help. Just so you know, there is going to be some math involved, so let’s get started.

Pool Volume Calculators

If you search online for “pool volume calculator” you will come up with numerous results. To use these calculators you will need to know the diameter and depth of your above-ground pool. For above-ground pools of a standard rectangular, oval, or round shape with a consistent depth, it is simple to plug in your numbers and get the resulting total cubic feet of water in your pool. 

What Measurements Do You Need to Know?

To figure out how many gallons of water are in your above-ground pool, you need to figure out the cubic volume of your pool. Your pool’s length, width, and depth are the factors that determine the answer to how many cubic feet of water are contained in your pool. When you plug in these numbers, the calculator quickly figures out the cubic volume. One cubic foot of water is equal to 7.5 gallons. Multiply the cubic volume by 7.5 and you will have the answer to how many gallons of water are in your above-ground pool. 

How to Do the Math Without a Calculator

To figure out how many gallons of water are in your above-ground pool without a calculator, you need to know three measurements: the length, width, and depth of the pool. Multiply the length times the width times the depth. Multiply the result of the calculation by 7.5 to have the answer. 

For example, say we have an oval or rectangular above-ground pool that measures 32 feet long by 16 feet wide and has a depth of four feet. 

32 x 16 x 4 x 7.5 = 15,360 gallons of water 

For a round above-ground pool, the measurements you need are the diameter (the measurement from one side of the pool straight across to the other) and the depth. Now we are getting into trickier math, as you will need to find the radius of the pool squared. Don’t be afraid, the equation isn’t that hard. Basically, divide the diameter by two, and multiply the result by itself, which will result in the radius of the pool squared. Multiply the radius squared by pi, then by the depth, then by 7.5.

For example, take a 24-foot round pool and divide it by two. 

24 ➗2 = 12   12 x 12 = 144 (radius squared)

144 (radius squared) x 3.14 (pi) x 4 (depth) x 7.5 = 13,565 (rounded up to the nearest gallon)

The Pool People offers a large variety of above-ground pools. The brands we carry are Radiant®, Doughboy®, Embassy®, and Cornelius®. Typically our pools are round or oval and an occasional style is rectangular in shape. The depth is usually four to five feet. There will be times when you need to know how many gallons of water are in your above-ground pool. The Pool People is a great resource for all your above-ground pool needs, and when you have questions, we welcome you into one of our four Wisconsin locations to chat with our professional staff. 

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