PC Power Supply & Wattage Calculator
Accurately calculate power requirements for your custom PC build. Accurately measure transient voltage spikes, peak wattage, and 80 PLUS efficiency headroom across Intel Core, AMD Ryzen, and NVIDIA RTX graphics cards.
Processor (CPU)
Select manufacturer (Intel/AMD), series, and processor model
+20% additional wattage
Graphics Card (GPU)
Graphics card power consumption is the largest factor in PC wattage
+15% Power
Motherboard Form Factor
Memory (RAM)
Storage & Cooling System
Case Fans, Lighting & Peripherals
Please Select Components
To calculate your PC's power consumption and recommended PSU wattage, please select your Processor (CPU) or Graphics Card (GPU) from the left panel.
Click to instantly view real-time wattage for a popular Core i7 + RTX 4070 Super configuration
Maintains peak efficiency zone () with .
Fahim Chowdhury
Lab SupportSystem Optimizer & Power Engineer, Pixahunt Lab
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Recommended Power Supplies for Your Build
100% compatible power supplies matching your estimated build
PSU recommendations will load once components are selected
Select your processor and graphics card to instantly view official 80 PLUS certified power supplies tailored to your system's peak wattage.
Power Supply Guide & Knowledge Hub
Why do you need 20% - 30% Headroom?
Power supplies operate at peak efficiency and lowest noise between 50% and 60% load. Extra headroom extends capacitor lifespan and prevents sudden reboots during intense gaming transients.
What is ATX 3.0 and 12V-2x6?
Modern RTX 40 and 50 series cards generate transient power spikes up to 200% in milliseconds. ATX 3.0 rated PSUs safely deliver up to 600W power through a single native cable without failure-prone adapters.
80 PLUS Bronze vs Gold
80 PLUS certification measures what percentage of wall power is delivered to the PC rather than wasted as heat. Gold rating lowers electricity bills, runs cooler, and keeps fan curves quieter.