What is the volume of 5 gallons of water in milliliters?

Remember K H D | d c m (kilo, hecto, deka, (liter, meter, gram), deci, centi, milli). These are the denominations you need to list when converting metric units. Liters are three places to the left of milliliters. So you have to move the decimal place three times to the left (same as dividing by 1000). You will get 500 mL = .5 L.