Reviewer: David Chen, PE (Power Electronics)
Reviewed for technical accuracy and practical application.
Reviewed for technical accuracy and practical application.
Determine the minimum required power supply unit (PSU) wattage for your custom computer build with our precise Computer Wattage Calculator.
Computer Wattage Calculator
Recommended PSU Wattage (Total Estimated Peak Load):
— WDetailed Calculation Steps
Computer Wattage Calculator Formula
$$ W_{total} = W_{CPU} + W_{GPU} + W_{RAM} + W_{DRIVES} + W_{FANS} + W_{BASE} $$
Where:
$W_{RAM} = \text{RAM Sticks} \times 5W$
$W_{DRIVES} = \text{Storage Drives} \times 10W$
$W_{FANS} = \text{Fans/Pumps} \times 3W$
$W_{BASE} \approx 100W \text{ (Motherboard, Peripherals, and 10\% Safety Margin)}$
Where:
$W_{RAM} = \text{RAM Sticks} \times 5W$
$W_{DRIVES} = \text{Storage Drives} \times 10W$
$W_{FANS} = \text{Fans/Pumps} \times 3W$
$W_{BASE} \approx 100W \text{ (Motherboard, Peripherals, and 10\% Safety Margin)}$
Formula Sources: Tom’s Hardware PSU Guide | Categories loan calculator