Ahead of discussing how to calculate gallons in a pool, let us understand what it is. To calculate gallons in a pool is the same as calculating the volume of a pool in gallons.

This concept is essential for example, when you are putting chlorine in a pool it is important to know the volume of a pool so that you can make accurate chemistry adjustments.

### Formula to calculate gal in a pool.

These calculations mostly depends on the shape of the pool. For regular shapes, we use the formula to calculate the volume. For instance if the pool’s cross-section is circular, we use the formula to calculate the volume of a cylinder.

For the irregular shaped pools, you can imagine the pool as a combination of smaller, regular shapes. Measure these various areas and use the calculations described previously for each square or rectangular area and for each circular area

**Example 1:**

Suppose you have a pool with a rectangular cross-section and it has a length of 8 meters and a width of 5 meters, if its depth is 7 meters, calculate the gallons in the pool.

We begin by finding the of the rectangular pool in meters.

Thus, the volume of the pool is 280 m³.

Since we know that to convert cubic meters (m) into gallons, you multiply the cubic meters by 264.172. Therefore;

Hence, the U.S. gallons in that pool are 73.968.16

**Example 2:**

Suppose you have a circular pool. If you measured its radius and found it to be 700 cm** **and its height is 154 cm. Calculate the amount of water in the pool in gallons.

**Volume of a Cylinder** = π x radius^{2} x height

**= ^{22}/_{7} x 700 x 700 x 154**

Therefore, the volume of the pool is 237,160,000 cm^{3}

To convert cm3 to gallons, we divide the cubic centimeters by 3,785.41.

**= 237,160,000 ÷ 3,785.41.**

Thus, the capacity of the pool is 62,651 gallons.