Power Supply Size Calculator | CalHub

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Power Supply Size Calculator

Estimate the required PSU wattage for your PC or electronic project.


Recommended PSU Size

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What Is a Power Supply Size Calculator?

A Power Supply Size Calculator helps you determine the correct PSU wattage required for your PC or electronic setup. By calculating the total power consumption of components such as the CPU, GPU, motherboard, storage devices, cooling fans, and peripherals, this calculator ensures your system runs safely, efficiently, and without power shortages. CalHub’s PSU Calculator adds a safety margin to recommend the ideal power supply.

How to Use the Power Supply Size Calculator

  1. Enter each component name along with its power consumption in watts.
  2. Add components such as CPU, GPU, RAM, SSD/HDD, cooling, and accessories.
  3. Click Calculate PSU Size to get the recommended wattage.
  4. The calculator automatically includes a safety margin for stable performance.

Why Use CalHub PSU Wattage Calculator?

  • Accurate PSU wattage estimation
  • Includes recommended safety margin
  • Perfect for gaming PCs and workstations
  • Helps prevent system crashes and power overload
  • Free online tool with no registration

Frequently Asked Questions (FAQs)

Yes, CalHub’s Power Supply Size Calculator is completely free and can be used without limits.

You need the power consumption (in watts) of major components such as CPU, GPU, storage drives, motherboard, cooling fans, and peripherals.

Yes, a recommended 20% safety margin is automatically added to ensure reliable and long-term PSU performance.

Absolutely. This calculator is ideal for gaming PCs, high-performance workstations, and custom-built systems.

No registration is required. You can instantly calculate PSU wattage online.