Formulas
- Rectangular: length × width × average depth
- Round: π × (diameter ÷ 2)² × average depth
- Oval: π ÷ 4 × length × width × average depth
- 1 cubic foot = 7.48 gallons
Example
A 32 × 16 ft pool, 3.5 ft deep at one end and 5.5 ft at the other, holds about 17,235 gallons. Raising free chlorine by 2 ppm takes about 201 g (7.1 oz) of 65% granular chlorine.
Chlorine basics
Keep free chlorine between 1 and 3 ppm and pH between 7.2 and 7.6. Sun, heat and many swimmers use chlorine faster. Always follow the label of your product.
Frequently asked questions
Why use the average depth?
A pool with a sloped floor holds about the same as a flat pool at the average depth.
How long does it take to fill?
It depends on the hose. A garden hose often delivers 500 to 1,000 liters (130 to 260 gallons) per hour.
See also
Results are estimates for information only and are not financial, legal or medical advice. Rates, taxes and fees vary — confirm with a professional or your lender.