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How much does it cost to run a 500 W gaming PC? Electricity usage explained

This 400 W average wall-load scenario costs $105.12 yearly. Your bill depends on the workload, hours, and local rate, not the wattage printed on the PSU.

This example uses a hypothetical 500 W wall-load baseline at 80%, giving 400 W average draw during four daily gaming hours. At the reference rate of $0.18/kWh, that consumes 584 kWh and costs $105.12 yearly, or $8.76 monthly. It is a workload assumption, not a prediction from a 500 W PSU label.

By TechCompare · Updated

Annual cost
$105
At $0.18/kWh
Monthly cost
$9
4 h/day at 80% load
Annual consumption
584 kWh
500 W load baseline

Calculator

Daily Cost
$0.29
Monthly Cost
$8.76
Yearly Cost
$105.12
584 kWh / year
This exact 500 W at 4 h/day scenario, pre-loaded. Change the load, price, or add a second device to compare.
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How this is calculated

Measure average wall power during your own games with a suitable power meter. The power supply label specifies its maximum DC output capacity, not AC consumption. Efficiency losses also affect wall draw. If you enter measured average watts, set utilization to 100% so the calculator does not reduce that measured value again. Model idle hours separately.

Verdict

The arithmetic is 500 W x 0.80 x 4 hours x 365 / 1000 = 584 kWh. At $0.18/kWh that is $105.12 yearly. The 80% factor is a chosen average-to-baseline ratio, not a universal gaming utilization or PSU efficiency. A measured 400 W average entered at 100% gives the same result. The 680 W average comparison costs $178.70 on the same schedule, a $73.58 difference.

More Gaming PC scenarios

850 W gaming PC, 4 h/day
This example assumes an 850 W wall-load baseline at 80%, or 680 W average draw, for four hours daily.
View details ➜
1200 W workstation, 8 h/day
This example uses a 1200 W wall-load baseline at 80%, giving 960 W average draw over eight daily hours.
View details ➜
100 W home NAS, 24/7
A 100 W home server or NAS running 24/7 at 80% load costs about $126.14 a year to power at $0.18/kWh, $10.51 a month.
View details ➜

Frequently asked questions

How much electricity does a 500 W gaming PC use?
This scenario averages 400 W, or 0.4 kWh per hour. Four hours daily consume 584 kWh yearly. A 500 W PSU rating alone does not determine consumption.
Will a higher wattage power supply increase my electricity bill?
Not by itself. Components and workload determine DC demand, while PSU efficiency affects AC wall draw. Compare efficiency at your actual load, not just rated capacity.
How should I account for idle gaming PC power?
Measure idle wall draw separately and calculate it for the hours spent idle. Add that energy to gaming consumption. Idle demand varies with components, connected displays, and power settings.

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