An 18x36-foot pool holds approximately 24,000 gallons of water.
A rectangular pool measuring 18 feet by 36 feet with an average depth of 5 feet contains about 24,000 gallons of water. This volume is calculated by multiplying the length (18 ft) by the width (36 ft) by the average depth (5 ft) to get cubic feet, then converting to gallons (1 cubic foot = 7.48 gallons).
Pool Volume by Depth
- 4-foot average depth: 21,600 gallons
- 5-foot average depth: 24,000 gallons
- 6-foot average depth: 28,800 gallons
Comparison Table: Pool Volumes by Size
| Pool Size | Average Depth | Gallons |
|---|---|---|
| 16x32 | 5 feet | 19,200 |
| 18x36 | 5 feet | 24,000 |
| 20x40 | 5 feet | 30,000 |
| 20x40 | 6 feet | 36,000 |
Calculating Your Pool's Gallons
- Measure length, width, and average depth in feet
- Multiply: Length × Width × Average Depth = Cubic Feet
- Multiply cubic feet by 7.48 to get gallons
Formula: Length × Width × Average Depth × 7.48 = Gallons