A 24-Foot Round Pool Holds Approximately 13,500 Gallons
A standard 24-foot round pool with an average depth of 4 feet holds about 13,500 gallons of water. This estimate assumes a uniform depth; deeper pools (e.g., 5-6 ft) may reach 16,000+ gallons. Always measure actual depth for precision, as shape and slope affect total volume.
How to Calculate Pool Gallons Accurately
Use this formula for round pools:
Volume (gallons) = π × radius² × average depth × 7.48- Radius: Half the diameter (24 ft ÷ 2 = 12 ft).
- Average depth: (Shallow end + deep end) ÷ 2. Example: (3 ft + 5 ft) ÷ 2 = 4 ft.
- 7.48: Converts cubic feet to gallons.
Gallon Estimates by Depth (24-Ft Round Pool)
| Average Depth (ft) | Estimated Gallons | Use Case |
|---|---|---|
| 3.5 ft | 11,800 | Shallow play pools |
| 4 ft | 13,500 | Standard family pools |
| 5 ft | 16,900 | Diving or deep-end pools |
Factors Affecting Pool Volume
- Shape irregularities: Oval or freeform pools require different formulas.
- Sloped bottoms: Gradual slopes increase volume vs. flat-bottom pools.
- Liner thickness: Subtract ~1-3% for vinyl liner pools.
- Water displacement: Account for swimmers, toys, or steps (add ~10% for safety).
Quick Reference for Common Pool Sizes
- 18-ft round (4 ft deep): ~7,600 gallons
- 21-ft round (4.5 ft deep): ~10,400 gallons
- 27-ft round (5 ft deep): ~19,000 gallons
When to Measure Precisely
- Adding chemicals (dosage depends on exact gallons).
- Installing a heater or pump (sizing requires accurate volume).
- Filling/draining (water cost estimates).
Pro tip: Use a water meter to track fill-up gallons for absolute accuracy.