Electronics calculator
What Desktop Power Supply Size Do I Need?
Find recommended psu wattage from cpu peak package power, gpu peak board power, and other component load.
Enter your measurements
What Desktop Power Supply Size Do I Need? The answer depends on cpu peak package power, gpu peak board power, and other component load. This calculator keeps those inputs separate and reports recommended psu wattage rather than relying on a generic size label.
- CPU peak package power — Required
- GPU peak board power — Required
- Other component load — Required
- Transient/boost factor — Required
- Sustained headroom — Required
Recommended PSU wattage
Enter the measurements above to calculate recommended psu wattage.
How the calculation works
The engine follows this rule: peakLoad=(cpuWatts+gpuWatts+otherWatts)×transientFactor; recommendedPSU=peakLoad×(1+headroom). It returns recommended psu wattage from the configured inputs.
Worked example
Example: CPU peak package power = 125 W; GPU peak board power = 300 W; Other component load = 30 W; Transient/boost factor = 1; Sustained headroom = 20%. Result: Recommended PSU = 546 W; Peak Load = 455 W.
Before you decide
Measure the actual item, opening or body dimension involved. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what desktop power supply size do i need, the limiting result on this page is recommended psu wattage.
Direct measurement/geometry calculation. No external reference is required for the arithmetic itself; the result is derived only from the user-entered measurements and the formula stored in calculationLogicJson.
Frequently asked questions
What does the Desktop Power Supply Size calculator tell me?
It returns recommended psu wattage from the measurements entered on this page. The calculation is specific to desktop power supply size, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for desktop power supply size?
Measure cpu peak package power, gpu peak board power, other component load, transient/boost factor, sustained headroom. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the recommended psu wattage?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned recommended psu wattage while allowing for the clearances, tolerances or ratings shown by its manufacturer.