Hardware
PC Power Consumption Calculator
Calculate active electrical draw, daily/monthly kWh consumption, and electricity bill costs.
€0.46
2.108 kWh / day (9 hrs active)
€14.11
64.13 kWh / month (average billing cycle)
€169.39
769.9 kWh / year total demand
Usage Breakdown & Electricity Rates
Hardware Power Draw by State (Watts)
What the Electricity Formula Actually Computes
The result uses the average load you enter, not the PSU rating. A system with a 750 W supply that idles at 40 W and games at 350 W consumes electricity according to those real numbers — which is why gaming only 3 hours a day costs far less than the "watts × 24 h" fear number.
One input deserves attention: the monitor. A 27-inch screen adds 25–40 W that most people forget to count. The calculator includes a fixed monitor allowance in the result, so subtract your monitor from the system wattage if you already included it.
Making Sense of Your Bill
- Europe: prices are quoted per kWh (typically €0.10–0.40 depending on country and contract).
- US: utilities bill in kWh too, typically $0.10–0.30 depending on state.
- A PC that games 4 h/day at 400 W costs roughly €25–35 per month at €0.25/kWh — the calculator shows your exact figure.
- Standby draw of a modern desktop is 1–3 W; leaving it plugged in all month adds well under €1.
How the Consumption Estimate Is Built
- Calculates kWh: (Watts / 1000) * Daily Hours * 30 days.
Example: Monthly Cost of a Work PC
Common Questions
Does my PC always draw the PSU rated wattage?
No. A 750W PSU only draws what hardware components actively demand from the wall.
Why is my PC consuming more power when idle?
Modern hardware drops into low-power C-states automatically, but RGB lighting, background applications, and high-refresh-rate monitors keep components active. Disabling unnecessary startup programs and enabling power-saver modes can reduce idle draw by roughly 30%-50%.
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Enter any resolution and diagonal screen size to get PPI, total pixels, aspect ratio, dot pitch, and the viewing distance beyond which individual pixels disappear.