Electronics & Office · Northeast
Cost to run a computer monitor in Maryland
At Maryland’s average residential rate of 21.77¢ per kWh, a computer monitor drawing 35W for 8 hours a day costs about $1.86 a month. Change the numbers below to match how you actually use yours.
Quick answer
Based on 35W and 21.77¢/kWh, the Maryland average for May 2026.
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— per year
Why the cost differs in Maryland
Maryland has the 37th cheapest residential electricity of the 51 US states and territories we track, at 21.77¢ per kWh against a national average of 18.44¢. That is +18.1% compared with the national figure. Maryland saw significant increases through 2025-26 driven by PJM capacity auction results rather than fuel costs. Retail choice is available, so your contracted supply rate may differ substantially from the state average. Data-center growth in the broader region is adding demand. Both heating and cooling seasons contribute, with humid summers driving the sharper peak.
For this appliance specifically, the difference works out to an extra $3.40 a year over what the same computer monitor would cost at the national average rate. Run the identical appliance in Hawaii and it would cost $53.14 a year; in Idaho it would cost $12.62. That spread of $40.52 is entirely down to location.
That works out to roughly 1.0% of a typical Maryland household's annual electricity bill - modest individually, though appliances in this range add up.
Maryland sits above the national average, so the running cost of this computer monitor is modestly higher than a typical US household would pay. Usage habits still matter more than location at this rate level.
Because Maryland has retail supplier choice, the state average blends many different contracted rates. If you have shopped for a plan, your own price per kWh is the number to put in the calculator.
| Location | Rate | Per month | Per year |
|---|---|---|---|
| Maryland this page | 21.77¢ | $1.86 | $22.25 |
| US average | 18.44¢ | $1.57 | $18.85 |
| Idaho cheapest state | 12.35¢ | $1.05 | $12.62 |
| Hawaii most expensive | 52.00¢ | $4.43 | $53.14 |
Maryland electricity rate trend
Rates in Maryland have moved from 19.29¢ to 21.77¢ per kWh over the last twelve months of published data. Nationally, residential rates rose about 6.2% year over year.
2025-06 to 2026-05 · cents per kWh
About running a computer monitor
A typical 27-inch monitor draws 20 to 45 watts. Larger and higher-refresh displays draw more, and multi-monitor setups multiply it directly. Brightness is the single biggest variable a user controls - halving brightness meaningfully cuts draw.
What actually changes the cost
- Models vary widely, from about 20W to 80W. Check the nameplate on your own unit rather than assuming an average, because the spread is more than 2x.
- If your utility offers time-of-use pricing, shifting this load off-peak can cut its cost substantially without using any less energy.
How we worked this out
The arithmetic is simple and we would rather show it than hide it. Divide watts by 1,000 to get kilowatts, multiply by hours of use and by the duty cycle to get kilowatt-hours, then multiply by your rate:
35W ÷ 1000 × 8h = 0.280 kWh/day × 21.77¢ = $0.061 per day
One honest caveat: Maryland’s figure is a state average published by the EIA. Your own utility’s tariff, any time-of-use pricing, fixed monthly service charges and local taxes all shift the real number. Put your actual per-kWh rate into the calculator above for a figure that reflects your bill.
Questions about computer monitor running costs
How many watts does a computer monitor use?
A typical computer monitor draws about 35 watts while running, with most models falling between 20W and 80W. Check the nameplate label or manual for your specific unit - the range is wide enough that averages can mislead.
How much electricity does a computer monitor use per day?
At around 8 hours of use a day and a 100% duty cycle, that works out to roughly 0.28 kWh per day, or about 8 kWh a month. Your actual figure depends on your usage and model.
Why does the cost differ so much between states?
Residential electricity rates across the US range from about 12.35 cents per kWh in North Dakota to 46.62 cents in Hawaii - nearly a fourfold difference. The same computer monitor, used identically, therefore costs almost four times as much to run in the most expensive state as in the cheapest.
Is it cheaper to run a computer monitor at night?
Only if you are on a time-of-use or variable tariff. On a flat rate, the time of day makes no difference to cost. If you are on time-of-use pricing, off-peak hours are typically materially cheaper, and shifting this load can reduce its cost without reducing usage.