12x24 Pool Gallons Calculator

Volume and dosing for a 12x24 ft pool

A 12 by 24 ft pool is one of the most common smaller in-ground and larger above-ground rectangular sizes. At a typical 4.5 ft average depth, it holds about 9,720 gallons -- length × width × average depth × 7.5.

This is a common enough size that many saltwater chlorinator systems are actually rated with a 10,000-15,000 gallon pool in mind, so a 12x24 pool often sits toward the smaller end of what a given chlorinator model supports -- worth checking against your unit's manual.

As with any size, if your actual shallow and deep-end depths differ from the 4.5 ft default, plug your real numbers into the full Pool Volume Calculator.

Where these numbers come from

The formulas and default values in this calculator are based on:

• standard rectangular pool volume formula (7.5 multiplier)
• salt dosing at 1 lb per 120,000 gallons per 1 ppm change
• liquid chlorine dosing at approximately 10 fl oz of 12.5% chlorine per 10,000 gallons per 1 ppm free chlorine increase

These are planning estimates. Test your actual water, follow product labels, and check your equipment manufacturer's guidance before you buy or dose chemicals.