PC Power Supply Calculator

Calculate the power supply requirements for your PC build with this comprehensive calculator

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About This Tool

This PC Power Supply Calculator helps you determine the exact wattage requirements for your computer build. Select your components including CPU, GPU, motherboard, RAM, storage drives, cooling systems, and peripherals. The calculator uses real power consumption data for thousands of components to provide accurate wattage calculations. It also recommends an appropriate power supply unit (PSU) with safety margins for stable operation. Perfect for building gaming PCs, workstations, or home computers.

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How to Use

Select your CPU from the dropdown menu
Choose your graphics card (GPU)
Add your motherboard type
Specify RAM modules count
Select storage drives (SSD/HDD)
Add cooling components
Include peripherals and other devices
Click 'Calculate Power Requirements' to see results
View recommended PSU wattage with safety margin

Frequently Asked Questions

Find Quick Answers

How accurate is this power supply calculator?

The calculator uses real-world power consumption data from manufacturer specifications and independent testing. It provides accurate estimates for typical usage scenarios including gaming and productivity workloads.

Why should I add a safety margin to my PSU calculation?

Adding 20-30% safety margin ensures your power supply operates efficiently, handles peak loads, and has room for future upgrades. It also extends the PSU's lifespan by preventing constant maximum load operation.

Can I use this calculator for gaming PC builds?

Yes, this calculator is ideal for gaming PCs. It includes power data for high-end GPUs and CPUs commonly used in gaming rigs, and accounts for the increased power draw during gaming sessions.

What if my component isn't listed in the dropdown?

For unlisted components, select the closest equivalent in terms of power consumption. The calculator provides average power values for different component categories to help with estimation.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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