PSU Wattage Calculator
Estimate total PC component wattage from CPU and GPU TDP, RAM, storage, and fans. Get PSU capacity recommendation with headroom and electricity cost per hour.
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What is PSU Wattage Calculator?
The PSU Wattage Calculator estimates your PC build's total power draw from CPU and GPU TDP, RAM, storage, and case fans. It recommends a PSU capacity with 30% headroom above peak, and estimates electricity cost per hour based on your local rate.
Key Benefits
- Prevent underpowered builds that crash under load
- 30% headroom for transient spikes and longevity
- Electricity cost estimate for long-term budgeting
- Overclock toggle for high-performance builds
Common Use Cases
- •Planning a new PC build and choosing the right PSU
- •Checking whether your current PSU can handle a GPU upgrade
- •Estimating electricity costs for a gaming or workstation PC
- •Comparing power draw across different CPU and GPU combinations
- •Verifying that an overclocked build has enough headroom
Calculate Your PSU Wattage
- Enter CPU and GPU TDP: Look up the TDP (thermal design power) of your CPU and GPU - these are the two biggest power consumers.
- Add peripherals: Enter the number of RAM sticks, storage drives, and case fans - each contributes a small amount.
- Toggle overclocking: If you plan to overclock, enable the toggle to add a 30% peak headroom buffer.
- Read the recommendation: The recommended PSU capacity includes 30% headroom above peak draw for efficiency and longevity.
Key Features
- CPU and GPU TDP as the primary power draw inputs
- RAM, storage, and fan power contributions included
- Overclock toggle adds a 30% peak headroom buffer
- PSU recommendation rounded up to the nearest 50W
- Electricity cost per hour based on your local rate
- Instant client-side results - no account needed