Our **watts to amps calculator** is an invaluable tool that helps convert **electrical power** (measured in **watts**) to **electrical current** (measured in **amperes** or **amps**).

Imagine you have a

60-watt light bulband want to know how much current it draws when connected to a120-volt outlet. Thiswatts to amps converterwould quickly tell you that the bulb draws0.5 amps.

**150 watts**at 120 volts: Amps = 150 watts / 120 volts = 1.25 amps**20 watts**at 120 volts: Amps = 20 watts / 120 volts ≈ 0.167 amps

At 120 volts,

150 watts is approximately 1.25 amps, and20 watts is approximately 0.167 amps.

## Watts to Amps Calculator

### At 120 Volts

Watts (W) | Amps (A) |
---|---|

100 W | 0.83 A |

200 W | 1.67 A |

300 W | 2.50 A |

400 W | 3.33 A |

500 W | 4.17 A |

600 W | 5.00 A |

700 W | 5.83 A |

800 W | 6.67 A |

900 W | 7.50 A |

1000 W | 8.33 A |

1100 W | 9.17 A |

1200 W | 10.00 A |

1300 W | 10.83 A |

1400 W | 11.67 A |

1500 W | 12.50 A |

1600 W | 13.33 A |

1700 W | 14.17 A |

1800 W | 15.00 A |

1900 W | 15.83 A |

2000 W | 16.67 A |

2100 W | 17.50 A |

2200 W | 18.33 A |

2300 W | 19.17 A |

2400 W | 20.00 A |

2500 W | 20.83 A |

2600 W | 21.67 A |

2700 W | 22.50 A |

2800 W | 23.33 A |

2900 W | 24.17 A |

3000 W | 25.00 A |

### At 240 Volts

Watts (W) | Amps (A) |
---|---|

100 W | 0.42 A |

200 W | 0.83 A |

300 W | 1.25 A |

400 W | 1.67 A |

500 W | 2.08 A |

600 W | 2.50 A |

700 W | 2.92 A |

800 W | 3.33 A |

900 W | 3.75 A |

1000 W | 4.17 A |

1100 W | 4.58 A |

1200 W | 5.00 A |

1300 W | 5.42 A |

1400 W | 5.83 A |

1500 W | 6.25 A |

1600 W | 6.67 A |

1700 W | 7.08 A |

1800 W | 7.50 A |

1900 W | 7.92 A |

2000 W | 8.33 A |

2100 W | 8.75 A |

2200 W | 9.17 A |

2300 W | 9.58 A |

2400 W | 10.00 A |

2500 W | 10.42 A |

2600 W | 10.83 A |

2700 W | 11.25 A |

2800 W | 11.67 A |

2900 W | 12.08 A |

3000 W | 12.50 A |

### At 480 Volts

Watts (W) | Amps (A) |
---|---|

100 W | 0.21 A |

200 W | 0.42 A |

300 W | 0.63 A |

400 W | 0.83 A |

500 W | 1.04 A |

600 W | 1.25 A |

700 W | 1.46 A |

800 W | 1.67 A |

900 W | 1.88 A |

1000 W | 2.08 A |

1100 W | 2.29 A |

1200 W | 2.50 A |

1300 W | 2.71 A |

1400 W | 2.92 A |

1500 W | 3.13 A |

1600 W | 3.33 A |

1700 W | 3.54 A |

1800 W | 3.75 A |

1900 W | 3.96 A |

2000 W | 4.17 A |

2100 W | 4.38 A |

2200 W | 4.58 A |

2300 W | 4.79 A |

2400 W | 5.00 A |

2500 W | 5.21 A |

2600 W | 5.42 A |

2700 W | 5.63 A |

2800 W | 5.83 A |

2900 W | 6.04 A |

3000 W | 6.25 A |

## Watts to Amps Conversion Formula

The formula for converting **watts to amps** depends on whether you’re dealing with **direct current (DC)** or **alternating current (AC)**. Let’s explore both:

### For DC Circuits:

**I = P / V**

Where:

I= Current in amps (A)P= Power in watts (W)V= Voltage in volts (V)

A **12V DC motor** consumes **24 watts**. What’s the current draw?

**I = 24W / 12V = 2A**

### For AC Circuits:

**I = P / (V * PF)**

Where:

I= Current in amps (A)P= Power in watts (W)V= Voltage in volts (V)PF= Power factor (typically between0.8and1)

**1000W heater** operates on **240V AC** with a power factor of **0.95**. What’s the current draw?

**I = 1000W / (240V * 0.95) ≈ 4.39A**

## How Do You Convert Watts to Amps

**Determine the circuit type**: Is it**AC**or**DC**?**Gather the necessary information**: You need to know the**power**(watts) and**voltage**(volts).**For AC circuits, identify the power factor**: If unknown, assume**1**for resistive loads or**0.8**for inductive loads.**Apply the appropriate formula**: Use**I = P / V**for**DC**or**I = P / (V * PF)**for**AC**.**Perform the calculation**: Divide watts by volts (and power factor for AC).**Round the result**: For practical applications, round to two decimal places.

**L**et’s convert **500 watts** to amps for a **110V AC circuit** with a power factor of **0.9**.

Circuit type:

ACPower:

500W, Voltage:110VPower factor:

0.9Formula:

I = P / (V * PF)Calculation:

I = 500 / (110 * 0.9) = 5.05ARounded result:

5.05A

## How Many Watts is 1 Amp?

- At
**120V**:**1A * 120V = 120W** - At
**240V**:**1A * 240V = 240W**

The relationship between **watts** and **amps** depends on the **voltage**.

To determine how many watts **1 amp** represents, we need to use the power formula:

**P = I * V**

Where:

P= Power in watts (W)I= Current in amps (A)V= Voltage in volts (V)

## How Many Amps is 1000 Watts?

**For a 120V circuit**:**I = P / V****I = 1000W / 120V ≈ 8.33A****For a 240V circuit**:**I = P / V****I = 1000W / 240V ≈ 4.17A**

To determine how many amps **1000 watts** represents, we need to know the **voltage** of the circuit. Let’s consider two common household voltages:

This demonstrates that **the same power (1000W) draws different amounts of current depending on the voltage**. **Higher voltage circuits** require less current to deliver the same power, which is why many **high-power appliances** use **240V circuits**.

## How Many Amps is 1500 Watts?

**For a 120V circuit**:**I = P / V****I = 1500W / 120V = 12.5A****For a 240V circuit**:**I = P / V****I = 1500W / 240V = 6.25A****For a 277V circuit**(common in commercial lighting):**I = P / V****I = 1500W / 277V ≈ 5.42A**

Following the same principle as before, let’s calculate the current draw for **1500 watts** at different voltages:

This comparison shows how **higher voltages allow for lower current draw**, which can be beneficial for **energy efficiency** and **wire sizing** in electrical systems.

## How Many Amps is 7500 Watts at 120V?

To calculate the amperage for **7500 watts** at **120 volts**, we’ll use the **watts to amps formula**:

**I = P / V**

**I = 7500W / 120V = 62.5A**

This high amperage shows why **7500-watt devices are rarely connected to standard 120V circuits**.

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