How to use this tool
Use exact CPU and GPU model power specifications, other loads and required connectors.
Enter your details
All defaults are editable planning assumptions. Use actual product specifications and site conditions where possible.
How the estimate works
Add exact maximum CPU, GPU and other component watts, add your selected headroom, then round the result up to the next 50 W step.
Where product limits or site conditions matter, confirm them against the exact model and installation before buying.
Understanding your result
The wattage estimate adds verified component loads and headroom. It is only a power starting point: a supply with enough advertised watts can still lack the connectors or transient capability a graphics card requires.
Choosing the right equipment
Check the exact GPU and CPU guidance, native power connectors, case form factor and PSU quality. Prefer a reputable model with appropriate protections and a warranty rather than selecting on wattage alone.