How To Check Your PC’s Power Consumption – 4 Methods

Stuart Williams
By Stuart Williams 10 Min Read
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Ever paused to wonder how much energy your computer is guzzling? It’s something we often overlook. But if you’re in the mood to boost your PC’s performance or push it a little extra (yes, I’m talking about overclocking), it’s essential to know. Imagine asking someone to run a marathon without enough water. Not a good idea, right?

Now, consider another scene: You’re staring at your electricity bill, and your eyebrows shoot up. You ponder, “How much did my computer contribute to this?” Finding out can be a good start to saving money and also giving our planet a breather. 🌎

Alright, let’s get to the main event. I’ll share three cool ways to check how much power your PC is using. By the end, you’ll be like a detective solving the mystery of the power-hungry PC!

1. Software Magic: HWInfo or LocalCooling


  • It’s Free and Friendly: Who doesn’t love free stuff? Plus, it’s user-friendly. Double win! 🎉
  • Component Check: You can see the power use of each part. It’s like a health check-up, but for your PC.
  • Spot the Thirsty Ones: Helps you point out the parts that just can’t get enough power.


  • Not Always Right: These tools try their best, but sometimes they might miss the mark.
  • Set-Up Time: You might need a tad bit of time and patience to get them rolling.

2. Online Power Supply Calculator


  • Fast & Simple: A super-quick way to get an idea without any fuss.
  • No Extras Needed: Just hop online, and you’re good to go.


  • Guesstimates: It’s more of an educated guess. Doesn’t consider the unique quirks of your PC.
  • Accuracy? Meh: Not the most precise method in the toolbox.

3. The Trusty Watt Meter


  • Super Accurate: This little gadget gives you top-tier readings.
  • Be Green: Helps you set things up to use less power.
  • Detective Mode: Tells you about those moments when your PC’s power use suddenly spikes.


  • Pricey: Yep, you’ve got to buy it. But think of the value it brings!
  • Big Picture Only: It tells you the overall story but doesn’t get into the specifics of each component.

#1 Check your PC’s power usage with LocalCooling

First up, we have this nifty little tool called LocalCooling. It’s like that friend who’s great at guessing. This software takes a peek at your computer’s main parts and gives a rough idea of the power they’re using. Plus, it even throws in some tips on how to save energy! 🍃

Here’s how you can start:

  1. Download & Start: Grab LocalCooling here (don’t worry, it’s safe) and get it running.
  2. Tweak the Settings: Hit the “Settings” button, then hop over to the “My power” tab.

But, remember to wear your skeptic hat! The numbers you see are estimates, and your PC’s power usage can dance around based on what you’re doing.

There’s a tiny hiccup, though: LocalCooling might get some hardware details wrong. Like, thinking you have a bigger or smaller monitor. Oops! But hey, no one’s perfect. It’s still a cool way to get a ballpark figure of how thirsty your machine is.

Want a backup buddy? Try Open Hardware Monitor. Bonus: it also spills the beans on your hardware’s temperature. ❄️

#2 Use HWiNFO to see real-time accurate wattage

Now, if you want to level up and get more precise numbers, meet HWiNFO. It’s like having a magnifying glass for your PC’s energy use. Not only does it tell you about each part of your computer, but it also gives you the low-down on power consumption.

Here’s how to use it:

  1. Dive Deep: Head over to “Monitoring > Sensor status”.
  2. See the Stats: You’ll see how much power parts (like your CPU) are using right now. Plus, it throws in fun facts like the least, most, and average power it used.

And if you’re the kind who loves having options, give Joulemeter a whirl. It’s a brainchild of Microsoft Research and is pretty good at guessing the power usage of your PC parts. There’s a tiny catch, though – it’s kinda old and hasn’t been updated in a while. But don’t let that stop you! You can still snag it from websites like Softpedia or Soft Radar.

#3 Want a better estimation? Try the Power Supply Calculator

Want a super cool, precise way to see your PC’s power use? Enter the OuterVision’s Power Supply Calculator. This is like having a tailor measure every little detail of your computer.

Here’s what’s fab about it:

  1. Custom Calculations: Split your computer into its parts: the brain (processor), memory, eyes (graphics card), storage, and even its life activities (like gaming or video editing). Cool, right?
  2. Pick Your Mode: You’ve got two choices: Expert or Basic. Expert dives deep into your PC’s nitty-gritty, while Basic asks for just the big stuff.

And a fun fact: I found it nails the estimation about 80% of the time. If you’re itching for something even sharper, read on.

#4 Watt meter can give you a real-time and accurate power consumption information

The watt meter is like the detective’s magnifying glass for PC energy sleuths. This little gadget gives you the real deal about your PC’s power usage. It’s like having a live reporter on the ground!

Here’s how it works:

  1. Plug & Play: Hook it up to your wall socket, then plug your PC into it.
  2. Instant Info: See that number on the screen? That’s how much power your PC is using! Some even toss in extra tidbits like how much it’d cost you over time.

Thinking of getting one? They’re easy to find in hardware stores or online spots like Amazon. They’re pretty budget-friendly too, around $15 or so. Here’s a sneak peek at some options:

  • Mecheer Watt Meter ($11.99): A solid choice that plays well with most gadgets.
  • HBN Electricity Usage Monitor ($13.99): Similar, but it boasts a slicker look.
  • Poniie PN2000 Electricity Usage Monitor ($27.99): Got a power-hungry PC? This can handle bigger loads and has a neat cable feature.

For those who like top-tier stuff, the P3 P4400 Kill A Watt is a popular pick. It can measure a whopping 1800W and is priced at around $30. Not bad, huh?

How to use a Watt meter to check power

Ready to jump into the world of real-time power measurement with your trusty watt meter? It’s super easy and quick. Let me guide you through it, step by step.

Using Your Watt Meter: A Step-by-Step Guide

  1. Set It Up: First things first. Take your watt meter and plug it into your regular wall outlet. It’s just like plugging in any other device.
  2. Connect Your PC: Now, grab your PC’s power cable. Instead of plugging it directly into the wall, pop it into the outlet on the watt meter.
  3. Power Up!: Hit that power button and let your computer come to life, just like you always do.
  4. Watch the Magic: Now for the cool part! 🌟 Take a peek at your watt meter’s display. What you see there is how much power your computer’s using right now. It’s updating in real time. Feel free to open a game, run a program, or just chill and watch as the numbers change based on what your PC is doing.

Wrapping It Up: Power Up and Measure Up!

In today’s tech-savvy world, it’s more important than ever to be informed about the energy our devices consume. Whether you’re looking to save on those electricity bills, be kinder to the environment, or just satisfy your techy curiosity, understanding your PC’s power consumption is key.

From software insights to nifty web tools, and finally the hands-on watt meter, we’ve explored various methods to get to the heart of our PC’s energy heartbeat. Each has its perks, but the watt meter stands out for its real-time accuracy.

So the next time you power up your PC, remember: it’s not just about the tasks you perform but also about the energy you consume. Stay informed, make smart choices, and happy computing! 🖥️💡🌍

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Hey, I'm Stuart, a tech enthusiast and writing expert. With a passion for technology, I specialize in crafting in-depth articles, reviews, and affiliate content. In the ever-evolving world of digital marketing, I've witnessed how the age of the internet has transformed technology journalism. Even in the era of social media and video marketing, reading articles remains crucial for gaining valuable insights and staying informed. Join me as we explore the exciting realm of tech together!
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