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How many watts does a computer monitor use?

A typical computer monitor uses 4–82 watts when running and draws 0.03–0.68 amps at 120 volts.

Computer monitor watts, amps and circuit

Typical power use of a computer monitor
Running watts4–82 W
Voltage120 V
Running amps0.03–0.68 A
Circuitstandard 120 V outlet

Also called: monitor, pc monitor.

Computer monitor watts by size and type

Running and starting watts of computer monitor types
Size or typeRunning watts, WVolts, VAmps, AStarting watts, W
Computer monitor4–821200.03–0.68—
24-inch4–271200.03–0.23—
27-inch9–381200.08–0.32—
32-inch or ultrawide12–821200.1–0.68—
050100Watts, WSize or typeComputer monitorComputer monitor, Running watts: 4–824–8224-inch24-inch, Running watts: 4–274–2727-inch27-inch, Running watts: 9–389–3832-inch orultrawide32-inch or ultrawide, Running watts: 12–8212–82020406080100Watts, WSize or typeComputer monitorComputer monitor, Running watts: 4–824–8224-inch24-inch, Running watts: 4–274–2727-inch27-inch, Running watts: 9–389–3832-inch or ultrawide32-inch or ultrawide, Running watts: 12–8212–82
Watts of computer monitor types. The lighter part of a bar is the upper end of the typical range.

How long a portable power station runs a computer monitor

Runtime of a computer monitor on a portable power station, at 85% inverter efficiency
Battery capacity, WhAt 82 W, hAt 4 W, h
5005.2106.3
1,00010.4212.5
2,00020.7425
3,60037.3765

A 500 Wh portable power station runs a computer monitor drawing 82 W for about 5.2 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 82 W.

What it costs to run a computer monitor

Running a computer monitor at 43 W, the middle of its 4–82 W range, for one hour a day uses 15.7 kWh a year. That costs about $2.83 a year at $0.18 per kWh, the US average residential price for August 2026.

W
h
$/kWh

Your bill's total ÷ kWh used. 0.18 is the US residential average.

Result
$0.24 / month
Per day
$0.01
Per year
$2.83
Energy per day
0.04 kWh
Energy per month
1.3 kWh

How it is calculated

  1. kWh per day = 43 W × 1 h ÷ 1,000 = 0.043
  2. Per month = 0.043 kWh × 30.4 days × $0.18 = $0.24

What affects computer monitor power use

Screen size, resolution and brightness drive the number: 4K, 5K and 8K panels sit at the top of each size. The figures are the on-mode power of ENERGY STAR certified monitors. In sleep mode most certified monitors use under a watt.

How the amps are calculated

Amps = watts ÷ volts. For 82 W at 120 V that is 0.68 A. The 4–82 W range covers typical models; the nameplate on a computer monitor gives the exact figure.

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