PSU Wattage Calculator
Calculate your PC's power requirements and find the perfect PSU.
Enter Your PC Components
Typical: Intel i5/i7 = 65-125W, AMD Ryzen = 65-105W, High-end = 125-250W
Typical: RTX 4060 = 115W, RTX 4070 = 200W, RTX 4080 = 320W, RTX 4090 = 450W
Each stick uses approximately 3-5W
~3-5W each
~6-10W each
~2-5W each
RGB strips, controllers, USB devices, etc.
Calculating your power needs...
Minimum PSU
0W
Bare minimum to run
Recommended
BEST0W
Optimal headroom for efficiency
Future-Proof
0W
Room for upgrades
Power Breakdown
Size Your Power Supply Correctly
Add up your CPU, GPU, and other components and this free calculator estimates your PC's total power draw — then recommends a PSU wattage with sensible headroom for peaks and future upgrades.
An undersized PSU causes crashes and instability; a wildly oversized one wastes money. Get the number right before you buy. Everything computes instantly in your browser.
Component-based estimate
Enter your CPU, GPU, drives, and fans — the tool totals their draw into one clear figure.
Safe headroom recommendation
The recommendation adds headroom for power spikes and upgrades, so your build stays stable under load.
Free and private
All calculations run in your browser — your parts list is never uploaded anywhere.
How to use
- Enter your CPU, GPU, and other components.
- Click Calculate to see total estimated draw.
- Buy a PSU at or above the recommended wattage.
Frequently Asked Questions
How much wattage does my PC need?
Enter your components above and the calculator totals their estimated draw, then recommends a PSU wattage with headroom.
What happens if my PSU is too weak?
Random shutdowns, crashes under load, and in worst cases component damage — a properly sized PSU is essential for stability.
Should I add headroom above the estimate?
Yes. The recommendation already includes headroom for power spikes, efficiency sweet spots, and future upgrades.
Does PSU efficiency rating matter?
80 Plus ratings measure how efficiently the PSU converts wall power — Bronze, Gold, and Platinum units waste less electricity as heat.
Is the calculator free?
Yes, free with no signup.
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