How many gallons is my pool?

Multiply length × width × average depth for a rectangular pool, then multiply by 7.48 to convert cubic feet to gallons. A 32 × 16 ft pool with a 5 ft average depth holds about 19,100 gallons. Round and oval pools use the area of the ellipse instead.

Add the shallow-end depth and the deep-end depth and divide by two. For a pool that’s 3 ft in the shallow end and 7 ft in the deep end, the average depth is 5 ft.

Every chemical dose — chlorine, acid, stabilizer — is calculated per gallon, so an accurate volume keeps your water balanced and avoids over- or under-dosing. It also sizes the pump and filter for proper turnover.