How many watts does a 144hz monitor use: Power Guide

A typical 144Hz monitor draws roughly 15 to 45 watts while it is on, although the exact number depends on the model, screen size, brightness, resolution, and built-in features. Many 24- to 25-inch Full HD displays sit toward the lower end, while some larger, brighter, or more feature-rich models draw more. The important point is that how many watts does a 144hz monitor use cannot be answered from refresh rate alone: the manufacturer’s power specification and your actual settings matter more than the 144Hz label by itself.

How many watts does a 144Hz monitor use?

For planning purposes, use 20–30W as a reasonable starting estimate for a mainstream 24- to 27-inch 144Hz LCD monitor, then verify the exact model. A lower-power unit can use less than 20W at normal brightness, while a model with a larger panel, high brightness, extra electronics, or a higher maximum rating can draw 35–45W or more. This is a practical range, not a guarantee for every display.

Manufacturer specifications illustrate the spread:

These figures are examples, not a controlled comparison: the models use different panels and their specifications do not all describe power in the same way. The most useful conclusion is that 144Hz monitors do not share a fixed wattage. Check the exact model number and determine whether its published number is typical, maximum, or measured on-mode consumption before using it for a bill estimate.

Why 144Hz does not determine power use by itself

Hertz describes how often a display can refresh its image each second. A 144Hz monitor can refresh up to 144 times per second, compared with 60 times per second for a 60Hz model. That capability helps motion look smoother, but it does not mean the monitor consumes 144 watts or uses 2.4 times as much electricity as a 60Hz screen.

A display’s wattage is the electrical power it draws while operating. Its consumption depends on the screen’s lighting or pixel technology, the electronics that process the signal, the brightness level, and optional features. Refresh rate is one part of the design, but the number alone does not tell you how much power the backlight, panel, or supporting circuitry uses.

Two monitors with the same size and refresh rate can therefore have different readings. Conversely, a well-designed 165Hz or 180Hz monitor can use less power than a less efficient 144Hz model. Treat refresh rate as a gaming and motion specification, not as a reliable electricity-use rating.

What changes a 144Hz monitor’s wattage?

Screen size and resolution

A larger panel generally needs more illuminated area, and higher resolutions can require different panel electronics. This is a useful rule of thumb, not an absolute law: backlight design, panel efficiency, and the manufacturer’s power limits can outweigh size alone. A compact 24-inch Full HD screen may consume less than a 32-inch 144Hz monitor, but you should compare published figures for the exact products rather than estimate from diagonal size only.

Resolution also matters when comparing Full HD with 1440p or 4K screens. More pixels do not automatically translate into a fixed wattage increase, because the panel and backlighting determine much of the overall demand. Still, higher-resolution models may add processing or connectivity features that affect the total. Compare complete specifications, not just the resolution label.

Brightness and HDR

Brightness is often a practical factor users can control. Turning the backlight or brightness setting up makes the screen more visible in a bright room, but it can also raise power consumption on an LCD monitor. The amount varies by model; a 50% brightness setting does not necessarily mean half the wattage of 100% brightness.

HDR can also change power draw, particularly on displays designed to produce very bright highlights or use more elaborate backlighting. Actual consumption may vary with the content being shown and the monitor’s brightness-limiting behavior. If you primarily use the monitor for text, browsing, or office work, you may not need to run it at maximum brightness all day. Choose a comfortable setting for your room instead of assuming the factory maximum is necessary.

LCD, OLED, and advanced backlighting

Most conventional gaming monitors use an LED-backlit LCD panel. In that design, the backlight is a major contributor to power use, so brightness settings can make a noticeable difference. Some LCD models use more advanced local-dimming or Mini LED backlights that can support higher peak brightness and more complex lighting control; their draw depends on implementation and content.

OLED works differently because each pixel produces its own light instead of relying on a single conventional backlight. Power consumption can vary with the image: a bright, mostly white desktop and a darker game scene may not draw the same amount. It is not accurate to say every OLED monitor uses more or less power than every LCD monitor. Compare measurements taken at similar brightness and with similar content if efficiency matters to you.

Ports, speakers, USB hubs, and charging

A monitor may consume extra power when it includes speakers, a USB hub, network features, or other electronics. USB-C models can be more complicated because they may also supply power to a laptop. If a monitor can deliver 65W or 90W over USB-C, that number describes its potential power delivery to a connected device, not the monitor’s own normal consumption.

When a laptop is charging through the display, a wall-meter reading includes that additional load, so it cannot be compared directly with the standalone monitor draw.

Typical wattage versus maximum power rating

Monitor specifications can present several figures, and they answer different questions. “Typical” power is an estimate under a defined or representative operating condition. “On-mode” power is measured while the display is active using a specified test method. “Maximum” power indicates a higher operating limit, often under demanding settings. Standby or sleep power applies when the screen is not actively displaying an image.

Do not assume that the maximum rating is what the monitor pulls continuously. ASRock, for example, lists 18W typical and up to 36W maximum for its 24.5-inch CL25FFB. An independent test of Lenovo’s 144Hz G25-10 measured 13.8W at a calibrated 120-nit brightness and 21.2W at maximum brightness and contrast. Both examples show why real draw can be lower than a maximum rating.

Also distinguish the monitor’s power consumption from the capacity printed on its power adapter. LG’s 24GL65B-B 144Hz monitor specification lists a 40W DC-output adapter, but that is the adapter’s rated output capacity, not proof that the screen uses 40W at all times. The same specification lists sleep and DC-off consumption below 0.3W. If a manufacturer only lists the adapter size and sleep draw, do not present the adapter rating as measured active power; look for an on-mode or typical wattage figure instead.

Standby, sleep, and off-mode figures are often under 1W for modern monitors, although the exact rating depends on the model and mode. Standby can remain slightly higher than true off mode because the monitor is still waiting for a signal or retaining functions. If you need the most accurate estimate for a particular display, measure it rather than treating every published number as equivalent.

How to calculate the electricity cost of a 144Hz monitor

To estimate running cost, convert watts to kilowatt-hours (kWh), the unit used on electricity bills. Multiply the monitor’s draw in watts by the number of hours it is on, then divide by 1,000. Multiply the resulting kWh by your electricity rate.

For example, a 30W monitor used for eight hours consumes 30 × 8 ÷ 1,000 = 0.24 kWh per day. At an illustrative residential rate of 17.3 cents per kWh, that is about 4.2 cents per day. The U.S. Energy Information Administration reported an average residential electricity price of 17.30 cents per kWh for 2025; your utility rate may be quite different, so use the rate on your own bill for a closer estimate.

The estimates below assume eight active hours every day, 30 days in a month, 365 days in a year, and a price of $0.173 per kWh. They exclude standby draw and any power supplied to other devices through the monitor.

These are calculations, not a promise about any specific monitor or utility bill. Actual consumption depends on your settings and use schedule, and local electricity rates vary. Even when the display is on for most of a workday, a single 144Hz monitor usually represents a relatively small part of a household electricity bill. A dual-monitor setup roughly adds the draw of the second display, although the two monitors may use different amounts of power.

Estimate your own cost

Use this formula with your model’s measured or credible typical wattage:

• Daily energy (kWh) = watts × hours used per day ÷ 1,000.

• Monthly cost = daily kWh × days per month × your electricity price per kWh.

• Annual cost = daily kWh × 365 × your electricity price per kWh.

If the spec sheet gives only a maximum number, calculate a conservative upper estimate with it and label it as such. A plug-in meter provides a better figure for typical everyday use.

How many watts does a 144Hz monitor use in real-world conditions?

A plug-in electricity meter is the most direct way to learn what a monitor takes from the wall. Connect the monitor’s power adapter or power cord to the meter, then plug the meter into the outlet. The reading at the wall includes losses from the power supply, so it measures what matters for your electricity bill. Follow the meter’s instructions and use a properly rated device; do not open the monitor or power adapter.

For a meaningful measurement, record several conditions rather than relying on a single moment:

• Normal use: Set your usual brightness and display mode, then use the desktop or applications as you normally would.

• Brightness comparison: Keep the content and refresh rate fixed, then compare your regular brightness with a lower and higher setting.

• Gaming or HDR: Measure while displaying the kind of game or video you use, especially if HDR is enabled.

• Sleep and off: Let the display enter sleep mode, then switch it off using its power control and record each reading separately.

Wait for the reading to stabilize, and write down your settings alongside the result. For OLED screens, try more than one type of content because a bright page and a dark scene can have different power requirements. If your USB-C monitor is charging a laptop, disconnect the laptop or account for that additional load before recording the monitor-only figure.

Software running on the PC generally cannot replace a wall-meter measurement of the display’s own power draw. A wall meter measures the combined electrical input at the outlet, while a manufacturer’s rating is usually based on a specified test method. Neither measurement should be described as a universal number for all 144Hz displays.

Does lowering the refresh rate save electricity?

It may change consumption, but the saving depends on the monitor. Running a display at 60Hz instead of 144Hz does not guarantee a large reduction, and it will not necessarily reduce power in proportion to the refresh-rate difference. Some model specifications do not provide separate measurements for 60Hz and 144Hz, so avoid assigning a universal percentage to the change.

If you bought a 144Hz monitor for competitive games, keeping 144Hz enabled is usually the point of owning it. For office work, you can test 60Hz if you want, but compare meter readings first and decide whether any saving is meaningful. Lowering excessive brightness, enabling a sensible energy-saving mode, and letting the screen sleep when idle may be more practical ways to reduce use. Keep the refresh rate that suits the task rather than compromising motion quality for an unverified saving.

Ways to reduce power use without replacing the monitor

Start with brightness. Set the level as low as is comfortable in your room, then raise it only when glare or ambient light makes the image difficult to see. If your monitor has an Eco or energy-saving preset, check whether it reduces brightness or alters the picture in a way you find acceptable. These modes vary, so a meter is the only way to confirm the actual reduction on your device.

Next, shorten the time the monitor remains active when you are away. Configure Windows or your operating system to turn the display off after a reasonable idle period, and confirm that the screen actually enters a low-power state. Screensavers do not necessarily save as much power as allowing the display to sleep, because a screensaver can keep the panel active.

Turn off features you do not use, such as integrated speakers or ambient lighting, if the monitor offers separate controls. This may produce only a small change, but it is easy to try. Avoid buying a new monitor solely to save a few dollars per year unless you also need an upgrade for image quality, size, reliability, or gaming performance. For many users, reducing brightness and avoiding unnecessary active hours is the more sensible first step.

Frequently asked questions

Does a 144Hz monitor use more electricity than a 60Hz monitor?

It can, but not by a fixed amount. The answer depends on panel design, brightness, resolution, and electronics as well as refresh rate. Do not assume a 144Hz model uses 2.4 times the power of a 60Hz model just because 144 is 2.4 times 60. To compare, measure both screens under similar conditions or use matching manufacturer power figures.

Is a 40W adapter the same as 40W monitor consumption?

No. An adapter rated for 40W can supply up to its specified output capacity; the monitor may draw less in normal use. Use an active or typical consumption specification, an on-mode rating, or a wall-meter measurement to estimate energy use. Adapter capacity can also include design headroom rather than the display’s continuous demand.

How much does a 144Hz monitor cost to run all day?

It depends on the wattage, hours, and your utility price. At 30W and $0.173 per kWh, 24 hours of continuous operation would use 0.72 kWh and cost about 12.5 cents per day, or roughly $3.78 over 30 days. This estimate assumes a constant 30W draw, which may not match changing content, brightness, or sleep periods.

Does the monitor use power when the PC is off?

It may. If the monitor remains connected to AC power, it can use a small amount in standby or off mode, depending on its design and how you switch it off. Check the manual’s sleep, standby, and off-mode ratings. If your meter shows an unusually high reading after the display appears off, verify the mode and connected devices before drawing a conclusion.

Does the gaming PC’s power supply include monitor wattage?

No. A desktop PC’s internal power supply powers the PC components; a monitor that has its own AC cable or adapter draws power separately from the wall. A whole-outlet or UPS reading may include both devices if they share that source, but a PC component power estimate does not automatically include an external monitor.

Final verdict

For a typical 144Hz monitor, start with an estimate of about 20–30W during active use, while recognizing that published and measured figures can range from below 20W to 45W or more depending on the design and conditions. The refresh-rate label alone cannot predict the electricity bill. Check the precise model’s typical or on-mode specification, avoid confusing an adapter’s wattage with actual draw, and use a plug-in power meter when accuracy matters. At eight hours per day, even a 30W screen costs only about $15 a year at the 2025 U.S. average residential electricity rate, although your own price and usage will determine the real total