Custom PC PSU Wattage Calculator

Quickly calculate the power supply capacity needed for your build.

This page provides a PSU Wattage Calculator to help PC builders estimate the total wattage required for their custom systems. Simply input the peak wattage and quantity of key components—CPU, GPU, motherboard, storage devices, fans, and peripherals—and get a recommended power supply size including a safety margin for efficiency and future upgrades.

Typical: 65–125 W; high-end up to 408 W
Typical: 200–350 W; high-end up to 600 W
Typical: 50–80 W; high-end up to 200 W
Typical: 3–5 W; high-end up to 10 W
Typical: 5–10 W; high-end up to 15 W
Typical: 3–5 W; high-end up to 8 W
Typical: 6–9 W; high-end up to 12 W
Typical: 15–30 W; high-end up to 45 W
Typical: 2–5 W; high-end up to 8 W
Typical: ~5 W; high-end up to 10 W
Typical: ~2 W; high-end up to 5 W