Above Ground Pool Volume Calculator
Calculate the water volume for any above ground pool. Select a common size or enter custom dimensions.
Choose Your Pool Size
Complete Above Ground Pool Volume Reference
| Pool Size | Shape | 3.5 ft depth | 4 ft depth | 4.5 ft depth |
|---|---|---|---|---|
| 12ft Round | round | 2,974 | 3,398 | 3,823 |
| 15ft Round | round | 4,646 | 5,310 | 5,974 |
| 18ft Round | round | 6,691 | 7,646 | 8,602 |
| 21ft Round | round | 9,107 | 10,408 | 11,709 |
| 24ft Round | round | 11,894 | 13,594 | 15,293 |
| 27ft Round | round | 15,054 | 17,204 | 19,355 |
| 30ft Round | round | 18,585 | 21,240 | 23,895 |
| 33ft Round | round | 22,488 | 25,700 | 28,913 |
| 12x24 Oval | oval | 5,947 | 6,797 | 7,646 |
| 15x30 Oval | oval | 9,293 | 10,620 | 11,948 |
| 18x33 Oval | oval | 12,266 | 14,018 | 15,771 |
| 18x40 Oval | oval | 14,868 | 16,992 | 19,116 |
| 21x41 Oval | oval | 17,780 | 20,320 | 22,860 |
How It Works
Above ground pools come in standard round and oval shapes. This calculator uses the following formulas:
- Round pools: Diameter × Diameter × Depth × 5.9 = Volume in gallons
- Oval pools: Long Diameter × Short Diameter × Depth × 5.9 = Volume in gallons
Select a common pool size to instantly see its volume at all standard depths, or switch to custom mode to enter your exact dimensions.
Frequently Asked Questions
How many gallons does a typical above ground pool hold?
Most above ground pools hold between 3,000 and 20,000 gallons. A popular 18ft round pool at 4ft depth holds about 7,650 gallons, while a large 24ft round pool at the same depth holds roughly 13,600 gallons.
How do I measure my above ground pool depth?
Measure the actual water depth, not the wall height. Above ground pools are typically filled 4-6 inches below the top rail. Standard wall heights are 48 inches (4ft) and 52 inches (4.33ft), giving water depths of roughly 3.5 to 4.5 feet.
Why do I need to know my above ground pool volume?
Knowing your pool volume is essential for adding the correct amount of chemicals (chlorine, pH adjusters, algaecide), sizing your pump and filter, calculating water replacement costs, and determining heater requirements.
What is the most common above ground pool size?
The most popular above ground pool sizes are 18ft round and 24ft round. The 18ft round is ideal for smaller yards and holds about 7,650 gallons at 4ft depth. The 24ft round is the most popular larger size, holding approximately 13,600 gallons.