The easiest way to find out your power supply wattage is to check the label on the PSU itself. Here's how:
To find the wattage, you must either physically inspect the unit or use indirect estimation methods. 1. The Most Accurate Way: Physically Check the Label how to check your power supply wattage
Remove the side panel of your computer case (typically the left side when looking from the front). The easiest way to find out your power
If you're using a pre-built computer or laptop, you can check the documentation that came with it. The wattage of the power supply may be listed in the: how to check your power supply wattage