Spa Volume Calculator
Calculate hot tub or spa volume from diameter and depth. Result in gallons.
Quick tips
Most round spas: measure inside diameter and water depth in feet. Typical hot tubs are 300–500 gallons.
Calculate hot tub or spa volume from diameter and depth. Result in gallons.
Most round spas: measure inside diameter and water depth in feet. Typical hot tubs are 300–500 gallons.