How many kegs of draft beer can be dispensed out of a CO2 tank?

As a general rule of thumb, it takes about a ½ Lb of CO2 to dispense a ¼ barrel of draft beer and 1 Lb of CO2 to dispense a ½ barrel of draft beer. This table lists the approximate number of kegs that can be dispensed from each size of CO2 cylinder.

A gas tank that is properly filled should read about 750 PSIG when the cylinder is at a 72°F temperature. CO2 gas pressure increases when it is exposed to heat, so if the gas tank temperature is above 72°F, the pressure will read higher than 750 PSIG. If the gas tank temperature is colder then 72°F, the pressure will read lower than 750 PSIG.

The tank pressure should read 750 PSIG until the liquid CO2 in the cylinder is gone, and the tank is almost empty. A decreasing pressure indicates the cylinder is nearly empty.