Pool Maintenance Tool
Know exactly how much water is in your pool for accurate chemical balancing, heating estimates, and pump sizing.
Chemical Accuracy
Prevent over-dosing
Save Money
On water & chemicals
Total Pool Volume
0
Gallons
Time to Fill (Hose)
~0 hrs
Why Pool Volume Matters
Knowing the exact volume of your swimming pool is the cornerstone of proper pool maintenance. It affects:
- Chemical Dosing: Adding too much chlorine or shock can be dangerous, while too little leads to algae.
- Pump Turnover: You need to know volume to ensure your pump runs long enough to filter all the water at least once a day.
- Heating Costs: Estimating the BTU required to heat your pool depends directly on the water mass.
How to Calculate Pool Volume
The basic formula is: Surface Area × Average Depth × Multiplier.
1. Average Depth
If your pool has a shallow end and a deep end, calculate average depth:
(Shallow Depth + Deep Depth) / 2.
2. Formulas by Shape
- Rectangular: Length × Width × Average Depth × 7.48 (for gallons)
- Round: π × Radius² × Average Depth × 7.48
- Oval: Length × Width × Average Depth × 5.9 (Approximate multiplier for ovals)
Common Questions
How long does it take to fill a pool?
An average garden hose delivers about 9-12 gallons per minute (540-720 GPH). A 20,000-gallon pool would take roughly 28-37 hours to fill.
What is the weight of pool water?
Water weighs 8.34 lbs per gallon (1 kg per liter). A typical 20,000-gallon pool holds over 166,000 lbs of water!
