Pool Volume by Size
How many gallons in a 12×24 pool?
A 12×24 ft rectangular pool with a 4.5 ft average depth holds approximately 9,700 gallons. With a 5 ft average depth the volume rises to about 10,800 gallons. Above-ground pools of this size typically use a shallower depth of 4 ft, which gives around 8,640 gallons.
How many gallons is an average inground pool?
A standard 16×32 ft inground pool with 5 ft average depth holds about 19,200 gallons. Larger pools scale up quickly — a 20×40 ft pool at 5 ft average depth holds roughly 30,000 gallons. The exact amount depends on the depth profile (shallow end vs. deep end), which is why average depth is used in the calculation.
How many gallons in a 24-foot round pool?
A 24-ft diameter round pool at 4 ft depth holds about 13,500 gallons. At 52 inches (4.33 ft depth), which is the most common size for above-ground round pools, it holds approximately 14,700 gallons. Use the calculator above and enter your exact depth for a precise result.
Frequently asked questions
How do I calculate pool volume in gallons?
For a rectangular pool, multiply length × width × average depth (in feet) × 7.48 to get gallons. For a round pool, use π × radius² × depth × 7.48. The calculator above handles all shapes automatically.
How many gallons does an average swimming pool hold?
A standard residential inground pool (16×32 ft, 5 ft average depth) holds about 19,200 gallons. Above-ground pools range from 5,000 to 15,000 gallons. Olympic pools hold 660,000 gallons.
How much chlorine do I need to shock my pool?
A general starting point is 1 pound of calcium hypochlorite (cal-hypo) shock per 10,000 gallons. Always follow your specific product's label, test the water first, and shock at dusk to prevent UV breakdown.