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These formulas can be used to calculate the capacity and loads of individual circuits, as well as for the entire electrical service. For example, a 20-amp, 120-volt branch circuit has a total capacity of 2,400 watts 20 amps x 120 volts. Since the standard recommendation is for the load to total no more than 80 percent of the capacity, this means that the 20-amp circuit has a realistic capacity of 1920 watts. So to avoid the danger of overloads, all the light fixtures and plug-in appliances together on this circuit should consume no more than 1,920 watts of power.