Power Supply Calculator
Calculate the required power supply wattage for your PC components. Select your CPU, GPU, and other components to estimate the minimum and recommended power supply wattage.
Published by:
isCalculator Editorial Team
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How to use this tool?
Step 1: Select your CPU tier from the dropdown. Options range from Low-end (65W) to Extreme (200W).
Step 2: Choose your GPU tier. Options range from Entry-level (75W) to Extreme (450W).
Step 3: Set the number of RAM modules (2 to 8, each module adds 5W).
Step 4: Set the number of Storage drives (1 to 4, each adds 10W).
Step 5: Set the number of Case fans (0 to 4, each adds 3W).
Step 6: Set Other components (None to Extreme, adds 0–100W).
Step 7: Click Calculate to see the total wattage and recommended PSU (rounded up to nearest 50W with 20% headroom). The breakdown shows each component’s power draw.
Note: All values are in watts (W). No unit conversion needed.
Previous Results
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Frequently Asked Questions
We sum the power consumption of all selected components and multiply by 1.2 to provide a 20% headroom, then round up to the nearest 50W increment for standard PSU ratings.
A 20% headroom ensures the PSU operates efficiently and can handle transient power spikes, prolonging the PSU's lifespan and maintaining system stability.
The calculator will still recommend a PSU based on the same formula. For extreme builds, consider high-wattage PSUs from reputable brands.