PC Power Consumption Cost Calculator
Estimates what a PC adds to your electricity bill.
Cost per year
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Cost per month —
Energy per year — kWh
Reading this —
The formula
kWh per year = Σ (watts × hours per day) × 365 ÷ 1,000 ÷ efficiency
Component wattages are what the parts use. The wall supplies more, because the power supply loses some as heat.
What to watch out for
Monitors and speakers are extra. A plug-in energy meter gives the truest wattage.
Frequently Asked Questions
How much electricity does this example PC use?
At 350 W for 3 hours, 70 W for 5 and 3 W otherwise, with a 90% efficient supply: 587 kWh a year.
What does that cost?
146.81 a year at 0.25 per kWh.