Data through June 2026
Running cost · Computer Monitors · ENERGY STAR certified
LG 20MK40L
The LG 20MK40L's certified consumption is 31 kWh per year, which prices out to about $5.72 at the national average rate — your hours of use scale that directly. That puts it in the most efficient tenth of every certified computer monitor — 31% less electricity than the median, ranked 135 of 1530. The same unit costs $4.09 a year in Nevada but $16 in Hawaii — electricity rates, not the appliance, make the difference.
Estimated annual running cost · U.S. average rate 18.3¢/kWh
$5.72/yr
- Per month
- $0.48
- Per day
- 2¢
- Certified use
- 31 kWh/yr
- Screen size
- 19.4 in
- Panel
- IPS LCD
- On-mode power
- 9.88 W
- Sleep-mode power
- 0.16 W
What it costs in every state
| State | Rate ¢/kWh | This model $/yr | Relative cost |
|---|---|---|---|
| Alabama | 16.4¢ | $5.12 | |
| Alaska | 28.2¢ | $8.80 | |
| Arizona | 15.2¢ | $4.74 | |
| Arkansas | 14.1¢ | $4.41 | |
| California | 34.7¢ | $11 | |
| Colorado | 17.1¢ | $5.34 | |
| Connecticut | 24.3¢ | $7.59 | |
| Delaware | 19.3¢ | $6.02 | |
| District of Columbia | 24.4¢ | $7.61 | |
| Florida | 15.1¢ | $4.71 | |
| Georgia | 16.4¢ | $5.10 | |
| Hawaiipriciest | 52.7¢ | $16 | |
| Idaho | 14.4¢ | $4.48 | |
| Illinois | 19.9¢ | $6.21 | |
| Indiana | 17.5¢ | $5.46 | |
| Iowa | 15.9¢ | $4.97 | |
| Kansas | 15.7¢ | $4.90 | |
| Kentucky | 14.3¢ | $4.45 | |
| Louisiana | 13.5¢ | $4.21 | |
| Maine | 29.6¢ | $9.23 | |
| Maryland | 21.8¢ | $6.81 | |
| Massachusetts | 29.6¢ | $9.24 | |
| Michigan | 23.0¢ | $7.17 | |
| Minnesota | 17.5¢ | $5.47 | |
| Mississippi | 14.9¢ | $4.64 | |
| Missouri | 16.2¢ | $5.06 | |
| Montana | 15.1¢ | $4.72 | |
| Nebraska | 13.3¢ | $4.13 | |
| Nevadacheapest | 13.1¢ | $4.09 | |
| New Hampshire | 27.0¢ | $8.43 | |
| New Jersey | 24.9¢ | $7.78 | |
| New Mexico | 15.1¢ | $4.70 | |
| New York | 29.5¢ | $9.20 | |
| North Carolina | 14.7¢ | $4.60 | |
| North Dakota | 14.1¢ | $4.41 | |
| Ohio | 19.2¢ | $5.99 | |
| Oklahoma | 14.3¢ | $4.47 | |
| Oregon | 16.3¢ | $5.09 | |
| Pennsylvania | 21.7¢ | $6.78 | |
| Rhode Island | 29.2¢ | $9.12 | |
| South Carolina | 15.6¢ | $4.85 | |
| South Dakota | 15.4¢ | $4.79 | |
| Tennessee | 14.1¢ | $4.39 | |
| Texas | 15.9¢ | $4.97 | |
| Utah | 13.4¢ | $4.17 | |
| Vermont | 24.4¢ | $7.63 | |
| Virginia | 17.2¢ | $5.37 | |
| Washington | 14.9¢ | $4.65 | |
| West Virginia | 15.4¢ | $4.82 | |
| Wisconsin | 19.6¢ | $6.10 | |
| Wyoming | 15.2¢ | $4.75 |
Certified models closest in efficiency
| Model | kWh/yr | $/yr (US avg) |
|---|---|---|
| DELL SE2225HMfmost efficient | 31 | $5.73 |
| ASUS VU249 | 31 | $5.73 |
| LG 20M35PH | 31 | $5.73 |
| ASUS MB16A | 31 | $5.71 |
| Sharp DD-E224FL | 31 | $5.74 |
| LG 20U401A | 31 | $5.76 |
Run your own numbers
Your rate, your numbers
- Per day
- 2¢
- Per month
- $0.47
- Per year
- $5.69
31 kWh/yr × 18.3¢/kWh = $5.69/yr
Prefilled with this model's certified 31 kWh/yr — adjust if your usage differs from the DOE test basis. The certified annual kWh (TEC) assumes the monitor is on 35% of the day and asleep the other 65%, per the ENERGY STAR test basis.
Questions, answered with the data
- How much electricity does the LG 20MK40L use?
- ENERGY STAR certifies the LG 20MK40L at 31 kWh per year. The certified annual kWh (TEC) assumes the monitor is on 35% of the day and asleep the other 65%, per the ENERGY STAR test basis.
- How much does the LG 20MK40L cost to run per month?
- About $0.48 a month at the U.S. average residential rate (18.3¢/kWh) — 2¢ a day, or $5.72 a year. Your state's rate moves this up or down; see the table above.
- Is the LG 20MK40L energy efficient?
- It uses 31% less electricity than the median certified computer monitor, placing it in the top 10% of certified models.
- What does the LG 20MK40L cost to run in the cheapest vs. priciest state?
- At current residential rates it costs about $4.09 a year in Nevada (13.1¢/kWh) and $16 in Hawaii (52.7¢/kWh).