If you’re wondering how many watts does a gaming monitor use, a practical starting estimate is roughly 20–60 watts for a conventional desktop gaming LCD at moderate settings. Larger displays and demanding HDR modes can use considerably more. Your exact consumption depends on the model, brightness, content, refresh rate, and connected devices. The most useful figure is the power your monitor draws during your normal sessions, rather than its adapter’s maximum rating.
- How many watts does a gaming monitor use during normal operation?
- Understand watts, watt-hours, and electricity costs
- Why manufacturer power specifications can look confusing
- What changes a gaming monitor’s power draw?
- How many watts does a gaming monitor use at your settings?
- Calculate the monthly cost of your gaming monitor
- Standby, sleep, and a black screen are different
- USB charging and extra displays can change the total
- Does monitor power affect your PC’s power supply or UPS?
- Reduce consumption without sacrificing useful gaming features
- Frequently asked questions
- Use measured power for the most reliable answer
How many watts does a gaming monitor use during normal operation?
There is no single wattage that applies to every gaming monitor. A compact LCD showing SDR content and a large, bright premium display can have very different power requirements.
For an initial electricity-cost estimate, 40 watts is a reasonable hypothetical starting point for a conventional gaming LCD when you have no specifications available. It is a calculation assumption, not a measured average across the market.
Manufacturer specifications demonstrate why checking the actual model matters. Dell lists 26 watts of on-mode consumption for its 27-inch G2724D. At the other end of the specification scale, Samsung lists 180 watts maximum for the 49-inch Odyssey G9 G91F, model LS49FG910ENXZA. These are different measurement categories, so they should not be treated as a direct efficiency comparison.
The following framework helps you choose the right number:
| Your question | Most useful power figure | Main limitation |
|---|---|---|
| What might normal use cost? | Measured session average | Changes with settings and content |
| What can I estimate before measuring? | Manufacturer on-mode figure | Uses specified test conditions |
| What should I allow for equipment capacity? | Documented maximum, plus appropriate headroom | Does not predict average consumption |
| What happens when the display sleeps? | Standby specification or measurement | Charging features may affect the result |
| How much energy did a session consume? | Accumulated watt-hours or kilowatt-hours | Requires a suitable meter |
For electricity bills, average power and operating hours matter most. For a battery backup, the maximum potential load also matters.
Understand watts, watt-hours, and electricity costs
Watts describe the rate at which a device consumes electrical energy. Watt-hours describe the amount consumed over time.
A monitor drawing 40 watts for one hour uses 40 watt-hours. Run it for five hours at the same average power, and it uses 200 watt-hours, or 0.2 kilowatt-hours.
Electric utilities generally bill energy consumption in kilowatt-hours, abbreviated kWh. The basic calculation is:
Energy in kWh = Average watts × Hours used ÷ 1,000
Electricity cost = Energy in kWh × Electricity rate
Virginia Cooperative Extension uses this same wattage-and-time method for estimating household equipment energy consumption.
A monitor does not consume “40 watts per hour.” It draws 40 watts while operating under the conditions being measured. Over an hour, that becomes 40 watt-hours of energy.
This distinction also explains why a brief high reading does not necessarily mean a high monthly bill. A display that occasionally reaches a higher wattage may still have a much lower average over an entire evening.
Conversely, a modest display left active all day can accumulate more energy use than a more demanding monitor used briefly.
Why manufacturer power specifications can look confusing
A monitor’s specifications may include on-mode consumption, maximum consumption, standby power, and an external adapter rating. Each describes something different.
On-mode and typical power
On-mode consumption describes an operating condition defined by a particular measurement procedure. A specification labeled “typical” also needs context: brightness, picture mode, resolution, and test content can affect its meaning.
These values help establish a starting point, but they do not guarantee the same result in every game.
When comparing two displays, check whether both numbers refer to equivalent conditions. Comparing one monitor’s SDR on-mode figure with another model’s maximum power can produce a misleading conclusion.
Maximum power
Maximum consumption describes a higher operating allowance under the manufacturer’s stated conditions. It should not automatically become your daily-use estimate.
Features such as high brightness, additional electronics, or powered peripherals may contribute to a model’s maximum, depending on its design.
If a specification lists 150 watts maximum, that does not establish that the monitor draws 150 watts throughout every session. Look for the accompanying notes before using that number in an electricity calculation.
Power adapter capacity
An adapter marked 20 volts and 6 amps has a rated DC output capacity of 120 watts:
20 V × 6 A = 120 W
That describes output capacity, not continuous consumption.
The monitor draws what its operating state requires within the power system’s limits. Wall consumption also includes conversion losses, so adapter output capacity and measured AC input are different quantities.
Likewise, multiplying a monitor’s AC input-label voltage and current is not a reliable way to determine normal operating watts. Input ratings describe electrical requirements; real AC power also depends on power factor and operating conditions.
What changes a gaming monitor’s power draw?
Several factors interact. Screen size alone cannot tell you the answer, and neither can refresh rate.
Brightness and the room environment
On an LED-backlit LCD, increasing the backlight level generally increases consumption. A display set for a brightly lit showroom may use more electricity than the same monitor adjusted for an evening gaming room.
The relationship between the brightness slider and wattage is not necessarily linear. Reducing a setting from 100 to 50 does not guarantee a 50% reduction.
Choose a comfortable brightness that preserves visibility. Then measure the result if energy consumption matters to your decision.
Screen size and display design
A larger display generally has more illuminated area, but actual consumption also depends on panel efficiency, brightness, electronics, and operating mode.
Two 27-inch monitors can draw different amounts of power. A 34-inch ultrawide also cannot be evaluated from diagonal size alone because its proportions differ from a conventional 16:9 screen.
Use size as context, then compare specifications or measurements. Treating every monitor of one diagonal measurement as electrically identical creates false precision.
OLED content and LCD backlighting
OLED pixels emit their own light, so image content affects panel energy use. Dark content can require less power than bright content under otherwise comparable conditions. Samsung Display explains that black OLED pixels switch off their light emission; its published laptop findings should not be transferred into a fixed savings percentage for desktop monitors.
An LCD with a conventional backlight behaves differently. A black wallpaper does not necessarily turn off its backlight.
Local-dimming LCDs add another variable because backlight zones can respond to the image. Consequently, dark mode is not a universal monitor power-saving switch.
HDR and image brightness
HDR can change power draw by changing how the monitor produces bright highlights and manages the picture.
However, an HDR label alone does not establish consumption. A small highlight against a dark background and a broadly bright scene place different demands on a display.
Do not use a monitor’s advertised peak brightness as a wattage figure. Peak brightness measures light output under specified conditions, not electrical input.
Refresh rate and resolution
Higher refresh rates can increase the work performed by display electronics. However, power does not scale directly with the refresh-rate number.
A 240Hz monitor does not automatically consume twice as much as a 120Hz monitor. Brightness, panel technology, and other design choices can outweigh that difference.
Resolution also affects display processing, but it does not provide a simple power multiplier. A 4K screen does not necessarily draw four times the power of a 1080p screen.
How many watts does a gaming monitor use at your settings?
A plug-in electricity meter provides the most direct practical answer for your own setup. Choose one that reports real power in watts and accumulated energy in kWh, with suitable accuracy for small electronic loads.
Measure the monitor’s AC input, including its external power adapter when applicable. That captures the electricity supplied from the outlet.
Follow this sequence:
- Connect the meter to a suitable outlet according to its instructions.
- Plug only the monitor’s power cable or adapter into the meter.
- Set your normal brightness, resolution, refresh rate, and picture mode.
- Allow the display to reach normal operation.
- Observe desktop use, a representative game, and HDR content if relevant.
- Record accumulated energy over a longer session.
- Check sleep behavior separately after the computer stops sending an active picture.
Measuring only the monitor is important. A meter attached to the entire desk’s power strip may include the desktop, speakers, chargers, and lighting.
For a session average, use:
Average watts = Session kWh × 1,000 ÷ Session hours
For example, if a hypothetical four-hour session consumes 0.18 kWh, the average is 45 watts.
A longer measurement is often more informative than one instantaneous reading because content, automatic brightness behavior, and connected-device charging can change during use.
Keep a short record of the test conditions. “45 watts at normal SDR brightness, 165Hz, no USB charging” is more useful than an unexplained number.
Calculate the monthly cost of your gaming monitor
Once you know average wattage, running-cost calculations are straightforward.
The table below uses an illustrative electricity rate of $0.20 per kWh, five hours of daily operation, and a 30-day month. These are calculation scenarios, not current national electricity-price claims or measured monitor results.
| Average operating power | Daily energy at five hours | Monthly energy | Monthly operating cost |
|---|---|---|---|
| 25 W | 0.125 kWh | 3.75 kWh | $0.75 |
| 40 W | 0.200 kWh | 6.00 kWh | $1.20 |
| 60 W | 0.300 kWh | 9.00 kWh | $1.80 |
| 100 W | 0.500 kWh | 15.00 kWh | $3.00 |
| 150 W | 0.750 kWh | 22.50 kWh | $4.50 |
For the 60-watt example:
60 × 5 × 30 ÷ 1,000 = 9 kWh per month
9 × $0.20 = $1.80 per month
Substitute your own average power, operating hours, and applicable utility rate. If you have time-of-use billing, calculate consumption during each price period separately when greater accuracy is necessary.
These figures cover active operation only. Add standby consumption separately if you want a complete estimate.
For a monitor used for both work and gaming, calculate each workload independently when its average power differs. Eight hours of office use and three hours of HDR gaming need not share the same wattage.
Standby, sleep, and a black screen are different
A display showing a black image can remain fully active. Sleep mode is a separate reduced-power state.
LG distinguishes normal operation, sleep, and DC-off states in its support documentation. Its examples show that low standby figures apply under stated conditions, and it advises checking the exact product manual because consumption varies by model.
Do not assume that switching the computer off removes all monitor consumption. The display may remain connected to AC power, search for an input, or supply power to accessories.
For scale, a hypothetical constant 0.5-watt standby load over 24 hours daily consumes:
0.5 × 24 × 365 ÷ 1,000 = 4.38 kWh annually
At the illustrative $0.20 rate, that costs about $0.88 annually. Actual standby hours would be lower when the monitor is active for part of the day.
The larger opportunity may be preventing hours of unnecessary active operation. A screen saver generally keeps the display working; a display-off timeout allows it to enter a reduced-power state.
Check OLED maintenance instructions before routinely cutting AC power immediately after use. Follow the model’s documented process for any automatic panel-care routines.
USB charging and extra displays can change the total
A monitor with USB-C power delivery can supply energy to a laptop. USB hubs may also power phones, storage devices, or other accessories.
When those devices are powered through the monitor, the monitor’s wall reading can include their consumption and conversion losses.
That does not mean the panel itself suddenly became inefficient. It means the measurement boundary includes more equipment.
For a useful comparison, record whether charging is enabled and what is connected. A laptop with a nearly depleted battery may create a different load from the same laptop after charging finishes.
For multiple monitors, add their actual average consumption. A hypothetical 40-watt primary display and 25-watt secondary display total 65 watts while both operate under those conditions.
The computer’s consumption is separate. Additional displays can affect GPU operating states on some hardware configurations, so the full workstation change may differ from the added monitor’s wattage alone.
If you want to measure that effect, compare total system power with the same applications running, first with one display and then with both. Keep other settings consistent.
Does monitor power affect your PC’s power supply or UPS?
A conventional monitor powered from a wall outlet does not draw its operating power from the desktop’s internal PSU through HDMI or DisplayPort.
You therefore do not add a separately powered monitor’s full wattage to the desktop PSU requirement.
For example, a monitor drawing 50 watts does not automatically require an additional 50 watts of internal PSU capacity. The desktop PSU must support the components and accessories it actually powers.
A UPS is different. If both the computer and monitor connect to its battery-backed outlets, both contribute to its load.
Suppose a hypothetical desktop draws 350 watts from the wall and its monitor draws 50 watts. Together, they represent a 400-watt operating load before other connected equipment.
Choose a UPS using both its watt and VA limits, appropriate capacity margin, and the manufacturer’s runtime information. Battery runtime does not scale perfectly from a simple wattage calculation.
A monitor’s average wattage helps estimate normal runtime, while its possible higher operating demand matters for capacity planning. Neither figure should be confused with the desktop PSU’s advertised maximum output.
Reduce consumption without sacrificing useful gaming features
Start with changes that remove wasted operating time. Then evaluate picture settings according to your actual preferences.
- Enable a display-off timeout for periods when you leave the desk.
- Use brightness appropriate for the room.
- Put an unused secondary monitor into sleep mode.
- Disable optional lighting if you do not need it.
- Review USB charging settings when accessories remain connected.
- Use dark interfaces on OLED when they suit your workflow.
- Compare SDR and HDR behavior using the content you actually play.
Do not disable a feature simply because its specification looks demanding. Measure the difference first.
Reducing refresh rate may save some monitor power, but the result is model-dependent. If you bought a high-refresh display for competitive play, the benefit may be worth retaining.
An in-game frame-rate cap can also change computer power use, but that is a separate question from monitor consumption. Record both independently if your goal is reducing the entire setup’s electricity use.
Replacement purchases deserve the same arithmetic. If a hypothetical new monitor saves 20 watts for five hours daily, the annual savings are 36.5 kWh. At $0.20 per kWh, that is $7.30 annually.
That operating-cost difference alone may not justify replacing a display that already meets your needs.
Frequently asked questions
How much electricity does a gaming monitor use in eight hours?
Multiply its average wattage by eight, then divide by 1,000. A monitor averaging 50 watts uses 0.4 kWh over eight hours. At an illustrative rate of $0.20 per kWh, that session costs $0.08. This excludes the computer and other equipment.
Does a 144Hz monitor always use more power than a 60Hz monitor?
No. Refresh rate is only one factor. Different screen sizes, brightness settings, and panel designs can reverse the comparison. To isolate refresh rate, measure the same monitor at both settings while keeping brightness, content, and other operating conditions consistent.
Will lowering game resolution reduce monitor electricity use?
It may change display processing, but it does not reliably produce a large panel-power reduction. The screen still illuminates its physical display area. Lower rendering resolution may also change GPU consumption, although the result depends on frame-rate limits and the workload.
Is a monitor’s maximum wattage the number to use for my bill?
Use a representative average when estimating normal electricity costs. Maximum wattage is useful for understanding the model’s operating allowance and planning equipment capacity. If you only have a maximum specification, label any resulting cost estimate as a maximum-based scenario.
Can monitoring software tell me the monitor’s wall consumption?
GPU power readings describe the graphics hardware, not a separately powered display. A monitor may expose certain internal readings, but those should not automatically be treated as AC wall consumption. A suitable plug-in meter measures the electricity supplied to the monitor’s power system.
Use measured power for the most reliable answer
A gaming monitor’s power consumption depends on the exact display and how you use it. Start with the manufacturer’s on-mode specification, distinguish it from maximum power and adapter capacity, and measure a representative session when accuracy matters.
Then convert average watts into kWh using your operating hours and electricity rate. This gives you a useful running-cost estimate while keeping monitor power separate from desktop PSU capacity, GPU consumption, and USB-connected charging loads.
