Pool Calculator

What Is a Pool Calculator?

A pool calculator answers the common question: how many gallons is my pool? Enter your pool dimensions and depth to get volume in US gallons, imperial gallons, liters, and cubic feet. It also estimates water fill cost. For pool chemistry and maintenance, see our Pool Water Maintenance Calculator.

How to Calculate Pool Volume

For a rectangular pool with a sloped bottom, multiply length, width, and average depth:

$$ V = l \times w \times \frac{d_1 + d_2}{2} $$

For an oval or circular pool:

$$ V = \frac{\pi \times l \times w}{4} \times \frac{d_1 + d_2}{2} $$

Where $d_1$ is the shallow end depth and $d_2$ is the deep end depth. If both ends are the same depth, enter the same value in both fields.

Converting Pool Volume to Gallons

• 1 cubic foot = 7.48 US gallons
• 1 cubic meter = 264.172 US gallons
• 1 US gallon = 3.785 liters
• Olympic pool (50 m × 25 m × 2 m) holds about 660,000 US gallons