Example: An air conditioner is powered by 900 Watts. How many Amps is that? It’s 7.5 Amps.
To convert electrical power to electrical current (Watts to Amps), we need to use the electrical power equation:
P = I*V
- P is electrical power, measured in Watts (W)
- I is electrical current or amperage, measured in Amps (A).
- V is electrical potential or voltage, measured in Volts (V). The standard voltage for most electrical devices is 110-120V, and upgraded voltage powerful electric devices use 220V.
Using this equation, we can convert watts directly to amps, if we know the voltage.
Watts To Amps Calculator (W to A)
Here you can easily convert watts to amps using this calculator:
To demonstrate how watts can be converted to amps, we solved a few examples of how many amps is 500 watts, 1000 watts, and 3000 watts. In the end, you will also find a watts-to-amps table at 120V electric potential.
Here’s a quick useful piece of info:
How many watts make an amp?
At 120V, 120 watts make 1 amp. That means that 1 amp = 120 watts.
How many watts in 1 amp at 220 volts?
At 220V, you get 220W per 1 amp.
With that in mind, let’s look at the 3 examples:
Example 1: How Many Amps Is 500 Watts?
Let’s say we have a 500W air conditioner plug into 120 V voltage.
Here is how we can calculate how many amps is 500W:
I = P/V
If we input the P = 500 Watts and V = 120 Volts, we get:
I = 500 Watts/120 Volt = 4.17 Amps
In short, 500 Watts equals 4.17 Amps.
What if the voltage would be 220V?
Let’s calculate how many amps is 500W at 220V:
I = 500 Watts/220 Volt = 2.27 Amps
At 220V, 500W draws 2.27 amps.
Example 2: How Many Amps Is 1000 Watts?
If we repeat the exercise and ask ourselves how many Amps equals 1000 Watts, we get:
I = 1000 Watts/120 Volt = 8.33 Amps
We see that a 1000 W device draws twice as many Amps as a 500 W device.
For 220V, we get this watts to amps calculation:
I = 1000 Watts/220 Volt = 4.55 Amps
In short, 1000W draws 8.33 amps at 120V, and 4.55 amps at 220V.
Example 3: 3000 Watts Equals How Many Amps?
3000 Watt devices can be plugin in 120V or into 220V. In cases with higher wattage, it’s not unusual to use a higher 220 voltage. This is designed to reduce the amperage.
For example, 3000 Watt equals to:
- 25 Amps, if you use 120 V.
- 13.64 Amps, if you use 220 V.
For 25 Amps, for example, you would already need an amp breaker. But if you plug such a device into 220 V, the current generated is only 13.64 Amps (there is no need for amp breakers).
Watts To Amps Table (At 120V)
|Watts:||Amps (at 120V):|
|100 Watts to amps||0.83 Amps|
|200 Watts to amps||1.67 Amps|
|300 Watts to amps||2.50 Amps|
|400 Watts to amps||3.33 Amps|
|500 Watts to amps||4.17 Amps|
|600 Watts to amps||5.00 Amps|
|700 Watts to amps||5.83 Amps|
|800 Watts to amps||6.67 Amps|
|900 Watts to amps||7.50 Amps|
|1000 Watts to amps||8.33 Amps|
|1100 Watts to amps||9.17 Amps|
|1200 Watts to amps||10.00 Amps|
|1300 Watts to amps||10.83 Amps|
|1400 Watts to amps||11.67 Amps|
|1500 Watts to amps||12.17 Amps|
|1800 Watts to amps||15.00 Amps|
|2000 Watts to amps||16.67 Amps|
|2500 Watts to amps||20.83 Amps|
|3000 Watts to amps||25.00 Amps|
Watts To Amps Table (At 220V)
|Watts:||Amps (at 220V):|
|100 Watts to amps at 220 volts:||0.45 Amps|
|200 Watts to amps at 220 volts:||0.91 Amps|
|300 Watts to amps at 220 volts:||1.36 Amps|
|400 Watts to amps at 220 volts:||1.82 Amps|
|500 Watts to amps at 220 volts:||2.27 Amps|
|600 Watts to amps at 220 volts:||2.73 Amps|
|700 Watts to amps at 220 volts:||3.18 Amps|
|800 Watts to amps at 220 volts:||3.64 Amps|
|900 Watts to amps at 220 volts:||4.09 Amps|
|1000 Watts to amps at 220 volts:||4.55 Amps|
|1100 Watts to amps at 220 volts:||5.00 Amps|
|1200 Watts to amps at 220 volts:||5.45 Amps|
|1300 Watts to amps at 220 volts:||5.91 Amps|
|1400 Watts to amps at 220 volts:||6.36 Amps|
|1500 Watts to amps at 220 volts:||6.82 Amps|
|1800 Watts to amps at 220 volts:||8.18 Amps|
|2000 Watts to amps at 220 volts:||9.09 Amps|
|2500 Watts to amps at 220 volts:||11.36 Amps|
|3000 Watts to amps at 220 volts:||13.64 Amps|
If you have a specific question about how to convert Watts to Amps, you can use the comment section below, and we’ll try to help you out.
When you figure out amps, you will probably need adequate wiring for your amp size. You can consult the ampacity AWG chart with wire sizes in mm, mm2, and amps here.