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PSU Wattage Calculator

PSU Wattage CalculatorRecommended SMPS watts from components. Fast, free and secure — works in your browser. By AK Computer, Dwarka.

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How to use

  1. 1 Select your CPU and graphics card from the component list.
  2. 2 Add other parts such as drives, RAM sticks and case fans.
  3. 3 Let the tool total the estimated power draw in watts.
  4. 4 Read the recommended SMPS wattage that includes safe headroom.

Frequently Asked Questions

How much extra wattage headroom should a PSU have?

Choose a PSU rated 20-30% above your peak load. If your components draw 400W, a 500W to 550W unit keeps the SMPS running cool, efficient and reliable under full load.

Does an 80 Plus rating matter for my build?

Yes. An 80 Plus Bronze or higher unit wastes less power as heat and runs quieter. For long daily use it saves electricity and protects your components with cleaner, stable voltage.

Can a weak or cheap SMPS damage my computer?

A low quality or undersized SMPS can cause random restarts, freezes and in bad cases damage the motherboard. Always size the PSU with headroom and choose a reputable branded unit.