Use this free PSU wattage calculator to find the right power supply for your gaming PC. Pick your CPU and GPU tier plus your parts, and we’ll estimate total system draw and the recommended PSU size (with efficiency headroom).
We add ~30% headroom for transients, efficiency and future upgrades, then round to the next common PSU size. Aim for 80+ Gold or better.
How much PSU wattage do you need?
Your power supply should comfortably exceed your system’s peak draw. This PSU wattage calculator adds your CPU and GPU power, your drives, cooling and fans, then applies ~30% headroom so the unit runs in its efficient mid-load range and leaves room for upgrades. Undersizing a PSU causes shutdowns under load; massively oversizing wastes money.
Why headroom and 80+ rating matter
Modern GPUs spike well above their rated TDP for milliseconds. A quality 80+ Gold unit with 30% headroom absorbs those transients and stays quiet and cool. Cheap, maxed-out PSUs are the #1 cause of random gaming crashes.
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