Pool Volume Calculator
Estimate how many gallons of water your swimming pool holds based on its shape, dimensions, and average depth. Knowing your pool volume is an important starting point for sizing pumps, filters, heaters, salt systems, and other pool equipment.
Calculate Your Pool Volume
Estimate your pool's water volume using its shape, dimensions and average depth.
Your Estimated Pool Volume
Your estimated pool volume is approximately 16,831 gallons.
Use this estimate when evaluating pool pumps, filters, heaters and water treatment requirements. Actual water volume can differ because of steps, benches, slopes, irregular shapes and other features.
How the Pool Volume Calculator Works
The calculator estimates the amount of water in your pool using its shape, dimensions, and average water depth.
For a rectangular or square pool, the calculator multiplies length by width, average depth, and a conversion factor of 7.5 gallons per cubic foot.
Length × Width × Average Depth × 7.5 = Approximate Pool Gallons
Round and oval pools require different formulas because their surface areas differ from rectangular pools. The calculator automatically applies the appropriate formula when you select the pool shape.
If your pool has a shallow and deep end, you can estimate average depth by adding the shallow-end depth and deep-end depth and dividing by two.
(Shallow Depth + Deep Depth) ÷ 2 = Average Depth
Pool volume is an important measurement when sizing pumps, filters, heaters, salt chlorine generators, and other equipment. It is also commonly used when calculating chemical additions and circulation requirements.
Once you know your approximate pool volume, you can use the Pool Pump Sizing Calculator to estimate circulation requirements, the Pool Filter Sizing Calculator to evaluate filter capacity, or the Pool Heater Sizing Calculator when choosing heating equipment.
For saltwater pools, pool volume is also needed when using the Salt Cell Sizing Calculator and Pool Salt Calculator.
The result should be treated as an estimate. Steps, benches, tanning ledges, attached spas, irregular shapes, sloped floors, and other design features can cause the actual water volume to differ from the calculated amount.
For an overview of how pumps, filters, heaters, salt systems, cleaners, and automation work together, see our Complete Guide to Swimming Pool Equipment.