How many watts does a gaming PC use?
A gaming PC uses 350–850 watts while running, which is 2.9–7.1 amps at 120 V.
Gaming PC watts, amps and circuit
| Running watts | 350–850 W |
|---|---|
| Voltage | 120 V |
| Running amps | 2.9–7.1 A |
| Circuit | standard 120 V outlet |
Also called: gaming computer, gaming desktop.
Gaming PC watts by size and type
| Size or type | Running watts, W | Volts, V | Amps, A | Starting watts, W |
|---|---|---|---|---|
| Gaming PC | 350–850 | 120 | 2.9–7.1 | — |
| Mid-range, gaming | 350–600 | 120 | 2.9–5 | — |
| High-end, gaming | 500–850 | 120 | 4.2–7.1 | — |
| Desktop use or idle | 60–100 | 120 | 0.5–0.83 | — |
What size generator runs a gaming PC?
A gaming PC needs a generator that supplies at least 850 running watts. A 2,000 W generator covers it with its running rating alone; add the watts of anything else you run at the same time.
How long a portable power station runs a gaming PC
| Battery capacity, Wh | At 850 W, h | At 350 W, h |
|---|---|---|
| 500 | 0.5 | 1.2 |
| 1,000 | 1 | 2.4 |
| 2,000 | 2 | 4.9 |
| 3,600 | 3.6 | 8.7 |
A 500 Wh portable power station runs a gaming PC drawing 850 W for about 0.5 hours at 85% inverter efficiency. Runtime = capacity × 85% ÷ watts; the 85% efficiency is an assumption. The power station's AC output must be at least 850 W.
What it costs to run a gaming PC
Running a gaming PC at 600 W, the middle of its 350–850 W range, for one hour a day uses 219 kWh a year. That costs about $39 a year at $0.18 per kWh, the US average residential price for August 2026.
Your bill's total ÷ kWh used. 0.18 is the US residential average.
- Per day
- $0.11
- Per year
- $39
- Energy per day
- 0.6 kWh
- Energy per month
- 18.3 kWh
How it is calculated
- kWh per day = 600 W × 1 h ÷ 1,000 = 0.6
- Per month = 0.6 kWh × 30.4 days × $0.18 = $3.28
What affects gaming PC power use
The graphics card is the largest load in a gaming PC, followed by the processor. Draw peaks during demanding games and falls far below the power supply rating at the desktop. The power supply rating is a ceiling, not the actual draw.
How the amps are calculated
Amps = watts ÷ volts. For 850 W at 120 V that is 7.1 A. The 350–850 W range covers typical models; the nameplate on a gaming PC gives the exact figure.