Watts to Current Calculator
Instantly convert Power (Watts) into Current (Amperes) to size breakers and wiring correctly.
Circuit Details
Circuit Current
How to Convert Watts to Current
Electrical Current (measured in Amperes or "Amps") represents the flow rate of electricity. When wiring a home or sizing an electrical breaker, you must convert the total Power rating (Watts) of all appliances on the circuit into a combined Current rating to ensure the wire doesn't overheat.
The Current Equation
- Formula:
Current = Watts / Volts - Example: A 1500 Watt space heater plugged into a standard 120 Volt outlet will pull exactly 12.5 Amps of current. A standard US bedroom breaker is 15 Amps, meaning adding a vacuum cleaner to the same circuit will trip it.
Frequently Asked Questions
What is the difference between AC and DC Current?
Direct Current (DC) flows like water in a river—always in one direction. It is used in batteries, cars, and solar panels. Alternating Current (AC) sloshes back and forth 50 to 60 times a second; it is used in long-distance neighborhood power grids because it's easier to transmit over miles without severe power loss.
Why does Three-Phase AC output less current?
Three-phase AC power overlaps three different alternating waves of voltage. Because power is delivered more constantly without "dead spots" in the wave, the same amount of Watts can be transferred through much thinner wires using less overall current amplitude.