Which measure could be the liquid of a bathtub 50 pints or 50 gallons

I think that it would probably be pints but that is just my thinking 

The standard bathtub, which measures 60 inches long by 30 inches wide, holds approximately 35 to 50 gallons of water. Larger units, such as soaking tubs or freestanding tubs, hold approximately 60 to 80 gallons of water. Spa or corner tubs typically hold 70 to 120 gallons of water.---So I say 50 Gallons