Pool Volume Calculator
Gallons in a pool, plus chlorine dosing.
Enter your values
Results update instantly as you type — no submit needed.
Results
- Volume
- 21,065 US gallons
- In litres
- 79,740 L
- Average depth
- 5.5 ft
- Surface area
- 512 sq ft
- Liquid chlorine for 1 ppm
- 22.5 fl oz
Quick answer
Rectangular pool gallons equal length × width × average depth in feet × 7.48.
Gallons = L × W × avg depth × 7.48
How to use the Pool Volume Calculator
- 1Pick the pool shape.
- 2Enter the dimensions in feet.
- 3Enter shallow and deep end depths.
Frequently asked questions
Why does volume matter?
Every chemical dose — chlorine, acid, stabiliser — is prescribed per 10,000 gallons, so an accurate volume prevents over-dosing.
How much chlorine for a shock?
Shocking usually targets 10 ppm free chlorine, so roughly ten times the 1 ppm dose shown above.