Select the Pool Shape
Choose rectangular, circular, oval, or irregular based on the overall layout of your swimming pool.
Free Swimming Pool Calculator
Pool Volume Calculator
Calculate the water capacity of rectangular, round, oval, and irregular pools in US gallons, UK gallons, liters, and cubic meters.
Multiple pool shapes
Feet and meter units
Instant calculations
Enter Pool Measurements
Select the pool shape and provide its dimensions.
4
Pool Shapes Supported
5
Volume Units
Instant
Calculation Speed
Private
No Data Is Stored
Simple Calculation Process
How the Pool Volume Calculator Works
Get an accurate estimate in three quick steps without performing complicated calculations manually.
Enter Pool Dimensions
Provide the length, width or diameter, and shallow and deep-end measurements using feet or meters.
Review the Results
The calculator instantly displays the capacity in gallons, liters, cubic meters, and cubic feet.
Why Pool Volume Matters
Knowing your swimming pool's water capacity is essential for proper maintenance. Pool chemicals, pumps, filters, heaters, and cleaning systems are normally selected or dosed according to the amount of water in the pool.
An incorrect volume estimate can lead to excessive chemical use, weak sanitation, wasted energy, cloudy water, and equipment that does not operate efficiently. Our Pool Volume Calculator simplifies the process and provides results in several commonly used units.
Average Pool Depth
Pools often have sloped floors. For this reason, the calculator adds the shallow and deep-end depths and divides the total by two. This produces an estimated average depth for the pool.
- Helps determine the correct chlorine and chemical dosage
- Supports proper pump and filtration system sizing
- Improves heating cost and refill-time estimates
- Works for both residential and commercial pools
Quick Reference
Common Pool Volume Examples
These examples use an estimated average depth and are provided for general comparison.
| Pool Shape | Dimensions | Average Depth | Estimated US Gallons |
|---|---|---|---|
| Rectangular | 20 ft × 10 ft | 5 ft | Approximately 7,481 gallons |
| Rectangular | 30 ft × 15 ft | 5.5 ft | Approximately 18,514 gallons |
| Round | 18 ft diameter | 4 ft | Approximately 7,614 gallons |
| Oval | 30 ft × 15 ft | 4.5 ft | Approximately 11,898 gallons |
Helpful Answers
Frequently Asked Questions
Learn more about estimating swimming pool capacity and measuring different pool shapes.
Add the shallow-end depth and deep-end depth, then divide the result by two. For example, a pool with a 3-foot shallow end and an 8-foot deep end has an estimated average depth of 5.5 feet.
One cubic foot of water contains approximately 7.48052 US gallons or 6.22884 UK gallons.
Yes. Select the irregular pool option, enter the approximate length and average width, and choose a shape adjustment factor that best represents the pool's curves and missing corners.
Measure the actual water depth rather than the full height of the pool wall. Water is normally several inches below the top edge, so using wall height can overestimate the total capacity.
The result is a practical estimate. Built-in steps, benches, curved walls, floor slopes, rounded corners, and the actual waterline can slightly reduce or increase the real water volume.
Pool volume helps you calculate chemical doses, choose an appropriately sized pump and filter, estimate heating requirements, and determine refill time and water costs.