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PC Power Supply Calculator
Enter your CPU and GPU TDP, add motherboard, RAM, drives and fans to estimate total system power draw. Get a recommended PSU wattage with a safety margin. Runs locally.
100% Private & Secure
This tool runs in your browser.
Your data is never uploaded or stored.
PC Components
2 x 5W
1 x 5W
0 x 10W
3 x 5W
Safety Margin
1.2x (aggressive)1.5x (balanced)1.8x (conservative)
Estimated Draw
355W
Sum of all components
Recommended PSU
497W
With 1.4x safety margin
PSU Tier
550W
Nearest standard wattage
Power Breakdown
CPU95W
GPU200W
Motherboard30W
RAM (2 sticks x 5W)10W
SSD (1 x 5W)5W
HDD (0 x 10W)0W
Fans (3 x 5W)15W
Liquid Cooling0W
Total Estimated Draw355W
Standard PSU Wattage Tiers
How to use
- 1
Enter CPU and GPU TDP values.
- 2
Add other component power draws.
- 3
See total draw and recommended PSU wattage.
Why use this tool?
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Fast, instant results — no waiting, no page reloads.
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Clean, focused interface designed for developers.
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100% private — everything runs in your browser, nothing is uploaded to any server.
Frequently Asked Questions
What safety margin is used?
A 1.3–1.5x multiplier is applied to the estimated total.
Is this accurate?
It provides a reasonable estimate based on TDP values. Actual draw may vary.