What is Power Supply Calculator?

Power Supply Calculator is a free online tool that helps you calculate and get instant results. No registration required.

How to use Power Supply Calculator?

Simply enter your values in the form above and click Calculate. Results are instant and free.

Yes, this tool is 100% free with no registration required.

Free online Power Supply Calculator Tool

CPU TDP (W)

RAM Sticks

Fans

CPU TDP (W)

GPU TDP (W)

RAM Sticks

Storage Drives

Fans

Headroom %

Free online Power Supply Calculator Tool

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Last Updated: 2026-03-28

Users: 10,000+

Rating: ⭐⭐⭐⭐⭐ 5/5