【How-to】How many amps does a blow dryer use

For example, think of a simple hairdryer rated at 1,500 watts running on a 120-volt bathroom branch circuit. Using the W ÷ V = A variation of Ohm’s law, you can calculate that 1,500 watts ÷ 120 volts = 12.5 amps. Your hair dryer running a maximum heat can draw 12.5 amps of power.