How to Use the Pool Calculator
Calculating your pool volume is essential for maintaining proper water chemistry. Whether you're adding chlorine, shock, or balancing pH, knowing exactly how many gallons of water you have ensures you don't over-treat or under-treat your pool.
1. Select Your Pool Shape
The geometry of your pool determines the formula used for calculation. Rectangular pools use Length x Width, while Round pools use the radius squared. Oval pools combine elements of both.
2. Enter Measurements
Enter the length and width (or diameter) in feet. For pools with a varying depth (a shallow end and a deep end), enter both values. Our calculator will determine the average depth automatically.
Manual Calculation Formulas
If you prefer to do the math by hand, here are the standard formulas used in the pool industry:
- Rectangular: Length × Width × Average Depth × 7.5 = Total Gallons
- Round: Diameter × Diameter × Average Depth × 5.9 = Total Gallons
- Oval: Long Diameter × Short Diameter × Average Depth × 6.7 = Total Gallons
Frequently Asked Questions
How many gallons are in a 24-foot round pool?
A standard 24-foot round pool with a 4-foot flat depth contains approximately 13,500 gallons of water. If the depth is 4.5 feet, it increases to roughly 15,000 gallons.
Why does pool volume matter?
It is the single most important number for maintenance. Over-dosing chemicals can damage equipment and irritate skin, while under-dosing allows algae to bloom and bacteria to grow.
How do I calculate average depth?
Simple! Add the shallow end depth to the deep end depth and divide by 2. For example: (3ft + 8ft) / 2 = 5.5ft average depth.