Watts to Amps Converter
Formula
Amps = Watts ÷ Volts
Divide watts by voltage to get amps (current). For a 1000W appliance on a 120V circuit: 1000 ÷ 120 = 8.33 amps.
How to use
- Enter the power draw in the Watts field.
- Enter the circuit voltage in the Voltage field.
- Read the current in amps from the result.
Example
For 1,000 Watts on a 120 V circuit, the current is 1,000 ÷ 120 = 8.33 amps. That fits within a standard 15-amp household circuit.
Frequently Asked Questions
How many amps is 1000 watts?
At 120V (US): 8.33A. At 240V (UK/EU): 4.17A.
Why do I need to know the amps for an appliance?
Knowing the amperage helps you determine if an appliance will overload a circuit. A standard US outlet is on a 15A or 20A circuit.
What is the relationship between watts, amps, and volts?
Watts = Amps × Volts. This is known as Watt's Law (the power law). Knowing any two of these values lets you calculate the third.
Does this formula work for AC motors and other inductive loads?
The simple watts divided by volts formula is exact for DC and for purely resistive AC loads like heaters and incandescent bulbs. For motors, transformers, and many electronics, you must also divide by the power factor, which is often around 0.8, because not all the current does useful work. That means a motor can draw more amps than the basic calculation suggests, so size circuits and breakers with that in mind.
How many amps does a typical household appliance draw?
On a US 120V circuit, a 60W bulb pulls about 0.5A, a 1,500W space heater pulls around 12.5A, and a 1,000W toaster pulls roughly 8.3A. (A microwave is a special case: its label is cooking-output power, so a '1,000W' microwave actually draws closer to 1,400W and 12A from the wall.) A standard 15A circuit can handle about 1,800W total, but the safe continuous limit is 80% of that, or about 1,440W. This is why running a heater and another high-wattage appliance on the same circuit often trips the breaker.