Model
Lg WM3450C*
Rank #107 means 106 of the 388 washing machine models we track cost less to run each year; the 74th efficiency percentile means it uses less energy for its size than 74% of those models.
What does the Lg WM3450C* cost to run per year?
Among the 388 washing machine models we track, the Lg WM3450C* sits in the below-average-cost group, rank #107, at roughly $19 a year. Size-adjusted, this model beats 74% of washing machine models we track on efficiency, better than most of its class. The IMEF figure of 2.92 on this model captures integrated modified energy factor, the main efficiency lever ENERGY STAR tracks for this class.
Immediately around it on the leaderboard, the Lg WM3400C* at $19/yr runs a little cheaper and the Lg WM3460C* at $19/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A washing machine typically stays in service for somewhere around 10 years; over that span, the Lg WM3450C*'s $19/yr adds up to roughly $190 in electricity alone, before purchase price or repairs.
Also sold as: Lg WM3090C*.
By the numbers
The Lg WM3450C* normalized against its whole class, so each figure means something.
What it costs you over time
Running cost is an every-year number, so it compounds. At $19/yr, here is what the Lg WM3450C* adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Lg WM3450C* costs about $190. That is roughly $10 less than the class median, which would run closer to $200 over the same ten years.
How the Lg WM3450C* compares
The washing machine class we track runs from $7 to $58 a year. At $19/yr, it runs about $1 a year cheaper than the class median of $20, and it is about $12 a year more than the cheapest washing machine to run at $7.
What drives its running cost
At 4.5 cu ft, the Lg WM3450C* is a mid-size washing machine for its class, which spans 1.9 to 6 cu ft with a median of 4.5 cu ft, putting it squarely in the middle of the class on the size lever that drives most of the cost. The IMEF of 2.92 on this model, above the class median of 2.76, measures integrated modified energy factor; it is the number to compare directly against another model's IMEF if capacity is similar.
- Spin and wash efficiency (IMEF). IMEF is this class's core efficiency yardstick; two washers with the same drum size can carry meaningfully different IMEF figures and running costs.
- Drum volume. A larger-capacity washer can wash more per load, which can lower cost per pound of laundry, but it also draws more water and energy per cycle if you are not filling it.
- Water heating. Most washers rely on your home's hot water supply, but internal-heater sanitize or hot-wash cycles use meaningfully more electricity than a cold or warm wash.
Common questions
Is the Lg WM3450C* cheap to run?
Yes. Its $19/yr running cost puts it at rank #107 of 388, below what most washing machine models we track cost to run.
How much does the Lg WM3450C* cost per month?
About $1.55 a month, which is the $19 annual estimate spread across twelve months at the US average rate of $0.1856/kWh. Your own bill scales with your local electricity rate and how heavily you use it.
How is this running-cost figure calculated?
The formula is annual kWh times price per kWh: 100 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $19 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Lg WM3450C* for its size?
74th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 109 | Lg WM3400C*4.5 cu ft | $19 |
| 108 | Lg WM3095C*4.5 cu ft | $19 |
| 107 | Lg WM3090C*4.5 cu ft | $19 |
| 106 | Gorenje WNPA64U2.3 cu ft | $19 |
| 105 | Gorenje WNPA54U1.9 cu ft | $19 |
Source
ES_1118034_WM3450C*_08272020033724_80054071View certified washing machine listingsENERGY STAR data as of July 2026Lg and WM3450C* are used here for identification only and are not endorsements. Figures are computed by WattWise Labs from public ENERGY STAR data, not measured in our own lab.