PC power supply calculator
Estimate your computer's maximum power draw and choose a PSU with sensible headroom for gaming loads, short power spikes and future upgrades.
Calculate with exact parts in the builder →FREE POWER CALCULATOR
Estimate the PSU wattage for your PC
Select realistic power ranges for your main components. The result includes motherboard, memory and storage overhead plus safety headroom.
How much PSU headroom should you allow?
A practical estimate should cover the CPU, graphics card and the rest of the system, then add safety headroom. PCNavo recommends at least 25% above the estimated maximum draw and more when planning power-limit changes or future upgrades.
Wattage is not the only consideration
- Choose a reputable unit with appropriate protections and warranty.
- Confirm the required GPU connectors and ATX standard.
- Check the manufacturer's PSU recommendation for your exact graphics card.
- Do not use low-quality adapters for high-power graphics cards.
- Leave enough capacity for short transient power spikes.
Why this is an estimate
Actual consumption depends on the exact model, boost behaviour, workload, firmware and power limits. Measure at the wall or consult professional system-integrator guidance when building a workstation or unusually high-power system.