Windows software to show computer’s energy usage or battery discharge rate


Is there any software for Windows 7 which can show a computer’s energy usage in real-time? I am currently using Battery Bar, which gives an estimated discharge rate, but this is essentially an average of the decrease in battery power over a given time period, and is not instantaneous – it seems to respond very slowly to changes. I would like something which shows me how many watts the computer is using at any given time. Furthermore, battery bar doesn’t work for desktop computers, and I would like to be able to gauge system energy usage for desktops as well.

If the software can also log power usage over time, that would be even better.

Asked by nhinkle


At last, I have found a solution! Microsoft has a free Research Labs program called Joulemeter which estimates power usage of the overall system and various components:

Joulemeter is a software tool that estimates the power consumption of your computer. It tracks computer resources, such as CPU utilization and screen brightness, and estimates power usage.

On laptops it uses internal power-measuring circuitry which I presume is present in most computers. For desktop computers, it can make estimates or use an external power measuring device to calibrate itself.

Unfortunately, I ran into some errors with the automatic calibration on my laptop (possibly related to the fact that HP batteries don’t provide as much battery usage data as other laptops do), but was able to calibrate it manually.

screenshot of joulemeter

I just found this and haven’t had much time to play with it yet, but it looks like it’ll do the job!

Answered by nhinkle