24 vs. 27 vs. 32-Inch Monitor: The Electricity Cost Gap

Screen size does move a monitor's electricity cost, but the dollar gap is usually modest: current certified medians are $8 for 24-inch, $10 for 27-inch, and $17 for 32-inch displays per year at the U.S. average rate. Resolution, brightness, and sleep behavior still make the specific model matter more than size alone.

Key takeaways

• 24-inch monitors: 41.14 kWh/year median across 456 certified models.
• 27-inch monitors: 53.65 kWh/year median across 488 certified models.
• 32-inch monitors: 89.07 kWh/year median across 115 certified models.
• The ENERGY STAR test basis includes active and sleep time, so changing your own sleep settings can change actual use.

Does a larger monitor use more electricity?

In the current certified dataset, median annual energy use rises with these three size groups: 41.14 kWh for 24-inch, 53.65 kWh for 27-inch, and 89.07 kWh for 32-inch monitors. A bigger panel can require more power, but it is not the only driver—resolution, panel technology, refresh rate, and brightness matter too.

The annual total-energy-consumption figure is useful because it includes an ENERGY STAR test pattern of active and sleep time. ENERGY STAR's computer and monitor information provides the product-program context; the individual model's certified annual kWh is the number to compare when shopping.

How much does each monitor size cost to run?

At 18.83 cents per kWh, the current certified medians work out to about $7.75 a year for 24-inch, $10.10 for 27-inch, and $16.77 for 32-inch displays. The 27-inch to 32-inch median jump is about $6.67 a year, while a dual-monitor setup doubles the effect of whatever model you choose.

These are annual comparison estimates, not a maximum-wattage calculation. A display used for long gaming or video sessions at high brightness can behave differently from the standardized test, while a monitor that sleeps reliably can use less than a display left active all day.

• 24-inch median — 41.14 kWh/year, about $7.75/year
• 27-inch median — 53.65 kWh/year, about $10.10/year
• 32-inch median — 89.07 kWh/year, about $16.77/year

How can you keep monitor energy use low?

Choose the screen size and display quality you need, then inspect annual kWh before checkout. Enable the computer's display sleep setting, use a comfortable rather than maximum brightness level, and remember that a second monitor adds another full device rather than a tiny standby load.

Compare the complete certified computer-monitor list or drill into 24-inch, 27-inch and 32-inch models. For a workstation-level view, see what a home office costs to run.

FAQ

Does a 27-inch monitor use more electricity than a 24-inch monitor? The median 27-inch monitor in WattCost's current certified dataset uses 53.65 kWh a year, compared with 41.14 kWh for the median 24-inch monitor. At the U.S. average rate, that is roughly $10 versus $8 annually, but individual model specifications vary.

How much does a 32-inch monitor cost to run? The current certified 32-inch median is 89.07 kWh a year, estimated at about $16.77 a year at WattCost's U.S. average electricity rate. This is a test-basis comparison estimate; actual active hours and brightness can change your result.

Do two monitors double electricity use? Two displays add the energy use of two separate devices, so two identical monitors would approximately double their combined monitor electricity use. The total home-office bill also includes the computer, networking equipment, speakers, chargers, and any other devices at the desk.

Does monitor sleep mode save electricity? Yes. The certified monitor annual-energy test includes sleep time, and a monitor that enters sleep when unused avoids drawing active-display power all day. The savings depend on your schedule and the difference between that model's active and sleep consumption.

Data notes and sources

Every WattCost dollar figure in this guide is certified annual electricity use multiplied by the U.S. average residential rate in the site's current data snapshot. See the WattCost methodology for the formula, source data, and limits. Product-program context: ENERGY STAR computer and monitor guidance.