PSU Calculator
Calculate the minimum power supply wattage your PC system needs to run stably.
Estimated total system power draw based on component specifications and usage profile. Click Start Test, enter your CPU, GPU, and other components, and view wattage recommendation.
What does this test measure?
Estimated total system power draw based on component specifications and usage profile.
Why is this test important?
Calculate the minimum power supply wattage your PC system needs to run stably.
How do you run the test?
Click Start Test, enter your CPU, GPU, and other components, and view wattage recommendation.
How should results be interpreted?
Always choose a PSU rated at least 20 percent above the calculated draw for headroom.
Normal and problematic results
Always choose a PSU rated at least 20 percent above the calculated draw for headroom.
Technical limitations
Actual power draw varies by load, efficiency rating, and component aging.
Why can the score decrease?
Unstable measurements, denied permissions, unsupported browser APIs, background load, power saving, or an incomplete test can affect the result. When a score changes, the result screen explains the reason.
What should you do if a problem is found?
Upgrade to a higher wattage PSU if your current unit is at or near its rated limit.
Example Result Explanation
Frequently Asked Questions
Does this test provide a definitive hardware diagnosis?
No. The test measures signals the browser can safely access and clearly explains its technical limits.
Why can results change between runs?
Background applications, power mode, network conditions, permissions, and operating-system timing can affect results.
How should I repeat the test if I see a problem?
Repeat it on the same device and browser while changing only one condition, so the source of the difference is easier to identify.