How to check a PC's power consumption

Computers today come in many shapes and sizes. Consequently, the power they use (measured in watts) differs based on their components, model, and form factor. The following sections provide a few methods for users to determine how much power their desktop or laptop computer regularly uses.

To proceed, select a method from the list below or read through them all to see which best suits your needs.

Using a hardware monitor utility

This method for checking power consumption involves downloading and installing a free tool that shows you the real-time power draw of each component in your computer.

1. Open your preferred Internet browser and navigate to the Open Hardware Monitor download page.
2. Click the Download Now button.
3. Click the downloaded file and follow the installation instructions.

• How to install software.

4. After installing and launching Open Hardware Monitor, you can expand each component's section to see how many watts it is currently using.

Using an online tool

There is a handy online tool offered by OuterVision that approximates your system's total power draw, provided you know the make and model of its internal components.

• How to find hardware and other computer specifications.

1. Open your preferred Internet browser and navigate to the OuterVision Power Supply Calculator.
2. Scroll down a bit and click the Basic tab (A).
3. Fill out each of the component fields (B).
4. Click the Calculate button (C).

5. In the Results section, Load Wattage displays the estimated power consumption of your computer.

Using a wattmeter

While a wattmeter does have an associated upfront cost, once purchased, it's a simple and accurate way to see your system's total power draw.

After buying a wattmeter (we suggest Amazon, Newegg, or your local computer store), plug it into the wall, and then plug your desktop or laptop power cord into it. The built-in screen displays how much power your computer uses in real-time.