Computer Power Supply (PSU) Wattage Calculator

Calculate Your PC's Power Supply Requirements

Typical Desktop CPUs: 65-250W. Find in CPU specifications.
Typical GPUs: 60-450W. Find in GPU specifications (add for multiple GPUs).
Number of RAM modules installed.
Average: 5-10W per DDR4/DDR5 stick.
Average: 25-60W depending on chipset and features.
Number of solid-state drives (SATA or NVMe).
Average: 2-5W (NVMe can be slightly higher than SATA).
Number of hard disk drives.
Average: 5-10W.
Number of cooling fans (including CPU fan if separate).
Average: 1-5W, depending on size, RPM, and RGB.
Estimate for keyboard, mouse, USB hubs, RGB strips, etc.
Set to 0 if no optical drive (CD/DVD/Blu-ray).
Recommended: 10-20% for future upgrades, overclocking, and PSU efficiency curve.

Determine the perfect power supply unit (PSU) for your computer build or upgrade with our free online calculator. Avoid power issues and ensure optimal performance by accurately summing up your components' wattage. Get a reliable PSU recommendation instantly, covering CPU, GPU, RAM, storage, and more.

Formula:

Total Component Wattage = CPUW + GPUW + (RAMSticks × RAMW/Stick) + (SSDDrives × SSDW/Drive) + (HDDDrives × HDDW/Drive) + MotherboardW + (CaseFans × FanW/Fan) + PeripheralsW + OpticalW
Recommended PSU Wattage = Total Component Wattage × (1 + Safety Overhead %)

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