Gaming PC Electricity Cost: Account for Play, Idle, and Off Time
A gaming session, an idle desktop, and an overnight shutdown are different parts of a day. Add their energy separately to estimate the PC’s running cost.
A three-state daily example
Suppose the PC draws 250 W while gaming for 4 hours, 60 W while idle for 6 hours, and zero watts for the remaining 14 hours. These are sample wall-power inputs, not measured results for a particular PC.
| State | Time | Energy / day |
|---|---|---|
| Gaming: 250 W | 4 hours | 1.00 kWh |
| Idle: 60 W | 6 hours | 0.36 kWh |
| Off: 0 W | 14 hours | 0 kWh |
| Total | 24 hours | 1.36 kWh |
At 18¢/kWh this is $0.2448 per day, $7.45 per average month, and $89.35 per year. Monthly estimates use 30.44 days.
Enter the schedule in the calculator
Use 250 active watts, 60 idle watts, 4 active hours, and 10 total hours on. The total includes both gaming and idle time. Entering 24 would model 20 idle hours instead of 6.
If the other 14 hours draw a measured 2 W rather than zero, add a separate “PC off-state” entry at 2 W for 14 hours. In this example it adds 0.028 kWh a day and $1.84 a year. Keep the periods separate so none is counted twice.
Include the rest of the desk deliberately
A measurement for the tower alone does not include separately powered monitors or speakers. For example, a 40 W monitor used for 6 hours adds 0.24 kWh per day, or $15.77 a year at the example rate, assuming zero draw outside those hours.
If one measurement already covers the entire desk, use that total instead of adding the same monitor and PC again. Keep a note of what each reading includes.
Use a week when days differ
A daily gaming schedule may not represent your weekends. If your total desk measurement is 10.5 kWh across a representative 7-day week, divide by 7 to get 1.5 kWh per day. That is a whole-day average of 62.5 W.
Enter 62.5 as both active and idle watts and use 24 total hours for that whole-day average. A weekly average already includes the periods when the equipment was off.
Compare settings with the same task
To evaluate a settings change, record energy for comparable games, durations, and workloads. A lower watt reading is not enough to establish a saving if the task takes longer or the experience is different. Compare total kWh for the job you actually want done.
Use period-specific prices if most gaming occurs during a more expensive tariff window.
Sources and calculation notes
Worked examples are Always On Cost calculations using the stated assumptions, not product tests or utility quotes. Unless noted otherwise, estimates use a fixed rate and repeating daily schedule, with 365 days per year. USD amounts are rounded for display.