# AC Wattage Calculator

The AC wattage calculator is the perfect tool to **obtain the amount of electrical power in an alternating current circuit**. It can also work as an AC current calculator if you know the wattage.

Within this short text, we will describe:

- What
**AC wattage**or**AC power**is; - How to calculate
**AC wattage**; - How to use the
**AC power formula**; and - Other features of this calculator.

Keep reading to learn more!

## What is wattage?

**Wattage** is a measure of the amount of power used by an electrical device. It is commonly calculated by multiplying the alternating current (AC) **voltage** by the alternating current (AC) **amperage** or **current**. This calculation provides a rough estimate of how much power the device consumes and is typically expressed in units of watts (W).

There are a number of factors that can affect the amount of power consumed by an electrical device, such as its **power factor**. This is a measure of how effectively the alternating current is being used to power the device and can be calculated using a simple formula.

💡 Read more about wattage and power in our Electrical power calculator.

## How to calculate AC wattage ─ AC power formula

To calculate wattage in AC circuits, we first need to know if the power is single-phase or three-phase.

For **single-phase** power, we will use the following formula:

where:

- $pf$ is the
**power factor**; - $I$ is the
**current**; - $V$ is the
**voltage**; and - $P$ is the
**power**or**wattage**.

While for **three-phase**, we will use either of the following depending on the voltage we're working with:

- $P = \sqrt{3}\cdot pf\cdot I\cdot V$, if using the
**line-to-line voltage**; and - $P = 3\cdot pf\cdot I\cdot V$, if using
**line-to-neutral voltage**.

🙋 **Tip:** you can also use this tool as an **AC current calculator**. Simply fill in every other field, and our calculator will automatically write the corresponding current value.