Amperes (A), volts (V), and watts (W) are the 3 basic electrical units, connecting electrical current, voltage, and power. Every electric device – from air conditioners to washing machines and generators – includes them in their specification sheets.

One of the most common questions here is this: *How to convert amps to watts?*

To convert amps to watts, we need to use the following formula for electrical power:

**P (W) = I (A) * V (V)**

In a simple equation, here’s the relation:

**Watts = Amps * Volts**

To calculate watts, we need both the amperage and voltage (usually either 120V or 220V).

LearnMetrics has prepared handy amps to watts calculator you can freely use. Below the A to W calculator you will also find a table with calculated watts from amps for 120V and 220V voltage systems. To illustrate how amps to watts calculation works, we have also solved 3 examples (scroll down).

Table of Contents

## Amps To Watts Calculator

### How Many Amps Are In A Watt?

For easier calculations, knowing how many amps are in a watt is very useful. We start with the original formula for electrical power:

**P (W) = I (A) * V (V)**

To calculate how many amps are in a watt, we need to specify the voltage. Let’s take the basic 120V. Here’s how we calculate the number of watts in a single amp:

**P (W) = 1 A * 120 V = 120 W**

As we can see, at 120V, 1 amp is equal to 120 W.

If we use the 220V voltage, we have this amps to watts equation:

**P (W) = 1 A * 120 V = 220 W**

At 220V, 1 amp is equal to 120 watts.

Here is a full amps-to-watts conversion chart, with solved examples below:

### Amps To Watts Conversion Chart

Amps | Watts (at 120V): | Watts (at 220V): |
---|---|---|

How many watts in 1 amp? | 120 watts | 220 watts |

How many watts in 2 amps? | 240 watts | 440 watts |

How many watts in 3 amps? | 360 watts | 660 watts |

How many watts in 4 amps? | 480 watts | 880 watts |

How many watts in 5 amps? | 600 watts | 1100 wats |

How many watts in 6 amps? | 720 watts | 1320 watts |

How many watts in 7 amps? | 840 watts | 1540 watts |

How many watts in 8 amps? | 960 watts | 1760 watts |

How many watts in 9 amps? | 1080 watts | 1980 watts |

How many watts in 10 amps? | 1200 watts | 2200 watts |

How many watts in 11 amps? | 1320 watts | 2420 watts |

How many watts in 12 amps? | 1440 watts | 2640 watts |

How many watts in 13 amps? | 1560 watts | 2860 watts |

How many watts in 14 amps? | 1680 watts | 3080 watts |

How many watts in 15 amps? | 1800 watts | 3300 watts |

How many watts in 16 amps? | 1920 watts | 3520 watts |

How many watts in 17 amps? | 2040 watts | 3740 watts |

How many watts in 18 amps? | 2160 watts | 3960 watts |

How many watts in 19 amps? | 2280 watts | 4180 watts |

How many watts in 20 amps? | 2400 watts | 4400 watts |

How many watts in 25 amps? | 3000 watts | 5500 watts |

How many watts in 30 amps? | 3600 watts | 6600 watts |

How many watts in 40 amps? | 4800 watts | 8800 watts |

How many watts in 50 amps? | 6000 watts | 11000 watts |

How many watts in 60 amps? | 7200 watts | 13200 watts |

How many watts in 70 amps? | 8400 watts | 15400 watts |

How many watts in 80 amps? | 9600 watts | 17600 watts |

How many watts in 90 amps? | 10800 watts | 19800 watts |

How many watts in 100 amps? | 12000 watts | 22000 watts |

How many watts in 150 amps? | 18000 watts | 33000 watts |

How many watts in 200 amps? | 24000 watts | 44000 watts |

Let’s solve some real-life examples:

#### 3 Amps To Watts (Example 1)

Let’s say that we have a 5000 BTU portable air conditioner. This is considered a very small air conditioner; it’s powered by only 3 amps.

How many watts does a 3 amp air conditioner use? It’s connected to 120V and we can use the upper amps to watts calculator to figure this out, like this:

In short, 3 amps is 360 watts.

#### 15 Amps To Watts (Example 2)

More powerful units, like washing machines and mini-split air conditioners, can be powered by 15 amps. How many watts is that?

Here’s the calculation of 15 amps to watts at 120V:

15 amps are equal to 1800 watts at 120.

If the voltage would be 220V, 15 amps would equal to 3300 W.

#### 100 Amps To Watts (Example 3)

More powerful electrical units can draw as much as 100 amps. For these units, you already need amp breakers. 5 zone mini-split units are a good example of 100 amps electric devices.

They are hooked up to 220V because 120V would need even more current. Here’s the conversion of 100 amps to watts:

This is a massive 22,000 W device at 100 amps.

If you have a specific example in mind, you can post in the comments below and we’ll solve it together.