Our Pool Volume Calculator is designed to make these calculations easy, accurate, and accessible. Knowing the exact water volume is essential for proper chemical treatment, filtration, and maintenance of your pool.

1. Calculating Pool Volume in Cubic Feet

The foundation of measuring pool volume is calculating it in cubic feet. Start by finding the area of the pool, then multiply by the average depth.

General Formula for Pool Volume (in Cubic Feet):

$\text{Volume (cubic feet)}=\text{Area}\times \text{Depth}$

2. Calculating Pool Volume to Gallons

Once the volume in cubic feet is calculated, you can easily convert it to gallons. Since 1 cubic foot of water is equivalent to 7.48 gallons, multiply the volume in cubic feet by 7.48.

Formula for Pool Volume in Gallons:

$\text{Volume (gallons)}=\text{Volume (cubic feet)}\times 7.48$

Example Calculation: If your pool has an area of 100 square feet and an average depth of 4 feet:

First, calculate the cubic feet:

100 sq ft × 4ft = 400 cubic feet

Then, convert to gallons:

400 cubic feet × 7.48 = 2,992 gallons

3. Calculating Pool Volume to Liters

For those using the metric system, you can convert cubic feet to liters by multiplying the volume in cubic feet by 28.317.

Formula for Pool Volume in Liters:

$\text{Volume (liters)}=\text{Volume (cubic feet)}\times 28.317$

Example Calculation: Using the example above, with a volume of 400 cubic feet:

400 cubic feet × 28.317 = 11,326.8 liters

Pool Volume Formulas by Shape

Different pool shapes require specific formulas for accurate volume calculation. Here’s how to calculate the area and apply depth for the most common pool shapes:

A. Rectangular or Square Pools

To calculate the area of a rectangular pool, multiply the length by the width.

$\text{Area (sq ft)}=\text{Length}\times \text{Width}$

Pool Volume (Cubic Feet):

$\text{Volume (cubic feet)}=\text{Length}\times \text{Width}\times \text{Depth}$

B. Round Pools

For round pools, use the radius of the pool to calculate the area with the formula for the area of a circle: 

$\text{Area (sq ft)}=\pi \times r^2$

Pool Volume (Cubic Feet):

$\text{Volume (cubic feet)}=\pi \times r^2\times \text{Depth}$

Example Calculation: If a round pool has a radius of 10 feet and a depth of 4 feet:

Calculate the area:

$\text{Area (sq ft)}=\pi \times {10}^2$

$\text{Area (sq ft) }=\text{ 314.16sq ft}$

Calculate volume:

314.16 sq ft×4 ft=1,256.64 cubic feet

C. Oval Pools

The formula for the area of an oval pool combines the lengths of both axes, using the formula for an ellipse:

$\text{Area (sq ft)}=\pi \times \text{major axis}\times \text{minor axis}÷4$

Pool Volume (Cubic Feet):

$\text{Volume (cubic feet)}=\text{Area}\times \text{Depth}$

Example Calculation: If an oval pool has a major axis of 20 feet, a minor axis of 10 feet, and a depth of 5 feet:

Calculate the area:

$\pi \times \text{20}\times \text{10}÷4=\text{157.08 sq ft}$

Calculate volume:

157.08 sq ft × 5 ft = 785.4 cubic feet

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