How to use this calculator
This rectangular-pool estimate converts cubic feet to US gallons. Irregular or rounded pools need a shape-specific adjustment.
Formula
Gallons ≈ Length × Width × Average depth × 7.48052
Example
A 20 × 10 ft pool averaging 5 ft deep holds about 7,481 US gallons.
Frequently asked questions
How do I find average depth?
For a uniformly sloped pool, add shallow and deep depths and divide by two.