The result gives . Compare to your system: if the calculator says 500W and your PC runs fine, your PSU is likely ≥500W.
Open the side panel of your computer case (you may need a screwdriver). how do i check my psu wattage
The (often circled or in a larger font) is your PSU’s rated wattage. Pay special attention to the +12V rail – modern CPUs/GPUs rely on it. If the +12V amps × 12 is far below the total, it’s a low-quality PSU. The result gives
If you cannot open the PC and no label is visible, calculate the minimum required wattage – not the existing one. This helps infer if the PSU is adequate. The (often circled or in a larger font)
If you don't want to open the case, you can often find the specs digitally:
Do not look at the "Input" number (which is often 100-240V). Look for the word "Total Power" or "Output" .