Remove the side panel of your computer case (usually the left side when looking from the front). Locate the large metal box where the power cord plugs in. Look for a spec label or "DC Output" table.
If you bought a Dell, HP, or Lenovo, find your specific model number. Search the manufacturer’s support site for the "Technical Specifications" or "Service Manual" for that model. Use Software to Estimate Total Draw check psu wattage on pc
For the most accurate measurement of actual consumption (not rated capacity), use a like a P3 Kill-A-Watt or a smart plug with energy monitoring. Remove the side panel of your computer case
If you want a more accurate measurement of your PSU's wattage, you can use a PSU wattage meter. These devices measure the actual power consumption of your PSU and provide a precise reading. If you bought a Dell, HP, or Lenovo,
If you can’t or don’t want to open your case, check your records.
But here’s the catch: unlike a CPU or GPU, you can’t simply open a system settings window to see PSU wattage. Windows, Linux, and macOS do not report this information. You have to get physical or rely on documentation. This guide will walk you through every possible method, from the simplest glance at a sticker to advanced software estimation and multimeter testing.