Spa Volume Calculator

Calculate hot tub or spa volume from diameter and depth. Result in gallons.

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Recommended Levels

See the full reference chart:

Quick tips

Most round spas: measure inside diameter and water depth in feet. Typical hot tubs are 300–500 gallons.

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WaterBalanceTools provides practical calculators and guides for pool and hot tub water chemistry. These tools are designed to help maintain safe chlorine, pH, and total alkalinity within a healthy water balance.