If you leave a portable ice maker plugged in all day and night, the electricity cost depends mainly on its wattage, your electricity rate, and how often its compressor actually runs.
For a quick estimate, a countertop unit rated at 120–170 watts would cost roughly $15–$21 per 30-day month if it drew its rated power continuously, using the 2025 U.S. average residential rate of 17.30 cents per kilowatt-hour. That is a useful upper-bound-style estimate—not a promise of what every machine will add to your bill. A real unit may cycle on and off, stop making ice when its basket is full, or use a different wattage.
The 24/7 cost calculation
Use this formula:
Daily cost = watts × hours used ÷ 1,000 × electricity rate
Use your rate in dollars per kWh. For example, 17.30 cents is $0.173.
Assume a portable ice maker is rated at 120 watts:
- 120 × 24 ÷ 1,000 = 2.88 kWh per day
- 2.88 × $0.173 = about $0.50 per day
- $0.50 × 30 = about $14.94 per 30-day month
At 170 watts:
- 170 × 24 ÷ 1,000 = 4.08 kWh per day
- 4.08 × $0.173 = about $0.71 per day
- $0.71 × 30 = about $21.18 per 30-day month
The U.S. Energy Information Administration reports that residential electricity prices vary by locality, so replace the example rate with the electricity price on your bill. Look for a line such as “supply,” “delivery,” or “total price per kWh.” If your bill separates charges, use the effective total cost when estimating the appliance’s effect on the bill.
What different electricity rates do to the estimate
The same 120–170-watt machine has a different cost depending on where you live. The table below assumes the machine draws its rated wattage for the full 24 hours every day for 30 days.
| Electricity rate | 120 W per month | 170 W per month |
|---|---|---|
| $0.10/kWh | $8.64 | $12.24 |
| $0.173/kWh | $14.97 | $21.17 |
| $0.30/kWh | $25.92 | $36.72 |
These figures exclude taxes, fixed utility fees, and time-of-use differences. They also do not account for a solar system, battery, demand charges, or a changing electricity rate. If your utility has peak and off-peak pricing, the simple calculation is only an average.
Why the actual 24-hour cost can be lower
A wattage label tells you the power draw while the appliance is operating at that rating. It does not necessarily mean the compressor draws that amount every minute it remains plugged in.
A portable ice maker generally makes ice in batches. Once the ice basket is full, a sensor may pause production; the machine can also cycle as it maintains its operating temperature. That means “plugged in for 24 hours” and “running at 120 or 170 watts for 24 hours” are not always the same thing.
For a more realistic estimate, use the number of active hours rather than automatically entering 24:
Monthly energy = watts × active hours per day × 30 ÷ 1,000
Monthly cost = monthly energy × your rate
For example, a 170-watt machine operating for an estimated four active hours per day uses:
- 170 × 4 × 30 ÷ 1,000 = 20.4 kWh per month
- 20.4 × $0.173 = about $3.53 per month
That example is not a universal performance claim. It simply shows why usage time matters so much. Your machine may run for more or fewer active hours depending on room temperature, water temperature, ice-size setting, ventilation, basket capacity, and how frequently ice is removed.
The most reliable way to find your cost
If you want more than an estimate, measure the machine’s actual energy use with a plug-in electricity monitor rated for the appliance and outlet. A useful test looks like this:
- Check the ice maker’s manual or rating label and note its wattage.
- Plug the monitor into a properly grounded outlet, then plug the ice maker into the monitor.
- Record the energy in kWh—not just the instantaneous watt reading—over a representative 24-hour period.
- Multiply the measured kWh by your effective electricity rate.
- Repeat the test on a normal-use day if the first day included an empty basket, unusually warm conditions, or unusually heavy ice demand.
The result will reflect cycling and pauses better than a nameplate calculation. It still may not represent every day, especially if your usage or the room conditions change.
Is it worth leaving an ice maker on continuously?
Continuous operation makes the most sense when you regularly need ice throughout the day and the basket does not stay full for long. If you only need ice with dinner or on occasional weekends, scheduled sessions are usually a better cost-control choice than leaving the appliance powered all the time.
The bigger decision is often convenience versus idle operation. Before choosing 24/7 use, ask:
- Do you actually use ice at different times of day?
- Will the basket fill and remain full for hours?
- Can you turn the machine on before peak demand instead of keeping it on overnight?
- Does your utility charge a notably higher rate at certain hours?
For a broader purchase decision, the ice maker buying guide can help you compare the characteristics that affect fit. Cost alone should not decide: a machine that makes more ice than you need can create unnecessary operating time, while an undersized one may require longer sessions.
Ways to reduce avoidable electricity use
- Match production to demand. Make ice in a planned session instead of running an empty or full-basket machine overnight.
- Use the correct water and ice settings. If your model offers different ice sizes or modes, choose the setting that meets your need rather than defaulting to maximum production.
- Keep ventilation clear. Do not cover the vents or push the unit tightly against surrounding objects; restricted airflow can make cooling harder.
- Keep the setup dry and grounded. Follow the manual’s placement instructions, keep water away from the plug and outlet, and use a suitable grounded receptacle.
- Clean on the manufacturer’s schedule. Mineral buildup and residue are maintenance issues first, but following the manual’s cleaning instructions helps the machine operate as intended.
- Turn it off when you are finished. If you will not use the ice maker for hours, switching it off prevents that unused plug-in time from becoming part of your bill.
Bottom line
At a 17.30-cent-per-kWh residential rate, a 120–170-watt portable ice maker would cost about $0.50–$0.71 per day, or $15–$21 per 30-day month, under a full-rated-power 24/7 calculation. Your actual cost can be lower because the machine may cycle and pause when ice is available.
For a dependable answer, take the wattage from your specific manual or label, use your utility’s effective rate, and measure kWh over a normal day if the estimate matters. Then compare that cost with how much ice you genuinely use; continuous operation is easiest to justify when it replaces frequent active sessions, not when the machine spends most of the day waiting.
