How much electricity does a dishwasher use? Find out by entering your wattage, how many hours a day you run it and your electricity rate, then hit Calculate. You get your monthly cost and the kWh it uses. Those same results also cover dishwasher power consumption.
If you have ever opened your utility statement and wondered how much electricity does a dishwasher use, the short answer is that the machine itself draws roughly 1,200 to 2,400 watts while it runs, which adds up to a few dollars of energy each month for a typical household. The longer answer depends on your cycle, your hot water source and your local rates, and this guide walks through each piece so you can put a real number on your own kitchen.
Most full-size machines are rated near 1,800 watts, which is the figure you will see quoted most often. Compact and portable models can get by on only a few hundred watts, while the most powerful units can pull 2,500 watts or more. Because your electric bill is measured in kilowatt-hours (kWh), the first conversion to learn is simple: one kilowatt-hour is 1,000 watts running for one hour.
A dishwasher does not draw its full rating for the whole cycle. The heating element, the circulation pump and the drain pump switch on and off as the cycle moves from wash to rinse to dry, so the rated wattage is best read as a ceiling rather than a steady draw. Still, the ceiling is a handy way to compare one appliance against another, and it keeps the arithmetic honest when you plug in your own numbers.
| Dishwasher type | Typical wattage | Energy for a 1.5-hour cycle |
|---|---|---|
| Compact or portable | 400 watts | 0.6 kWh |
| Older full-size model | 1,900 watts | 2.85 kWh |
| Average full-size model | 1,800 watts | 2.7 kWh |
| Efficient full-size model | 1,350 watts | 2.03 kWh |
| High-power model | 2,500 watts | 3.75 kWh |
The number on the label only tells part of the story. According to the figures most manufacturers publish, the pump and control electronics account for roughly 1,200 watts of the load, about the same as a blow dryer or a hairdryer running for the length of the cycle. Unless the machine has its own booster heater, that is nearly all of the electricity it uses directly. Next, look at how many watts does a refrigerator use.
Your dishwasher borrows hot water from the hot water heater, and the heater has to burn gas or electricity to supply it. When you count that second appliance, the real cost of a load can more than double. An inefficient water heater makes the gap wider, which is why even an ENERGY STAR certified model can still appear expensive on a monthly statement if the tank behind it is old.
Older machines made before 1994 could use 10 to 15 gallons per load, while certified models today stay below four. Less water usage means less heating, so every water efficient design is also an energy saver. If you want to compare water and power side by side, think of the gallons as a stand-in for the heat you pay for elsewhere.
To estimate your own energy use, multiply the wattage by the hours the machine runs, divide by 1,000 to get kWh, then multiply by your rate. Add the hot water share as a separate line.
$$\text{Cost per load} = \frac{\text{Watts} \times \text{Hours}}{1000} \times \text{Rate} + \text{Hot water kWh} \times \text{Rate}$$
Take a dishwasher rated at 1,350 watts with a 1.5-hour cycle, an electricity price of $0.17 per kWh, and an electric water heater supplying 3.4 gallons per load, warmed 52°F from the inlet temperature.
Run five loads a week and that is 260 loads a year, or roughly 639 kWh and $108.61, which works out to about $9.05 on your monthly bill. Because the heating element cycles on and off, treat this as a conservative upper estimate.
| Loads per week | Loads per year | Yearly kWh | Yearly cost at $0.17 | Monthly cost |
|---|---|---|---|---|
| 3 | 156 | 383 kWh | $65.16 | $5.43 |
| 5 | 260 | 639 kWh | $108.61 | $9.05 |
| 7 | 364 | 894 kWh | $152.05 | $12.67 |
| 10 | 520 | 1,278 kWh | $217.21 | $18.10 |
Your rate matters as much as your habits. At $0.12 per kWh the same five weekly loads cost about $76.66 a year, while at $0.34 they approach $217.21. Look at the per kWh price on your statement, and remember the national average sits somewhere in the middle of that range.
Two machines with the same wattage can have very different electricity consumption once settings come into play. A longer cycle uses more power, a sanitize option raises the water temperature, and a delicate setting lowers it. The drying stage matters most.
The eco mode can look slower, but the slower cycle uses less heat, so the total energy falls even though the clock runs longer. Look for these options in the control panel before assuming your machine is the problem.
Soil level and rack layout also shape the result. A heavily soiled setting adds a pre-wash and extends the run, so a machine that finishes in ninety minutes on a normal setting may run closer to three hours on the heaviest one, and the electricity grows in step with the clock. A sensor-equipped model adjusts for you by measuring how cloudy the rinse is, which is why two identical machines in different kitchens can post different numbers on the same week. If your bill creeps up and you have not changed your routine, check which setting the machine defaults to when it powers on, because many units revert to the heavy or sanitize option after a power cut.
To see the effect, take the 1,350 watt example again. Stretching the run from 1.5 to 3 hours doubles the machine's own draw from 2.03 kWh to 4.05 kWh, so the load that cost $0.42 would cost about $0.76 once the hot water share is added. That is the reason checking the cycle length printed in your manual is as useful as checking the wattage, and why choosing a shorter setting for lightly soiled plates is one of the easiest ways to trim the yearly total.
Some utilities charge by the hour of the day, which is called time of use pricing. Evening and overnight windows are often cheaper because demand drops, and these off-peak periods, sometimes labelled off-peak hours, are the best time to run a load. Most modern machines include a delay-start button that makes this easy.
If your region charges $0.34 at the evening peak and $0.12 overnight, the same 2.46 kWh load costs about $0.84 at peak and $0.30 after midnight. Moving five loads a week into the cheap window saves roughly $140 over a year, which makes it the quickest change you can make without buying anything.
It sounds backwards, but a machine often wins. Modern models use up to nine times less water than a sink full of rinse water, and less hot water means less heater use. Washing a full tub by hand with the tap running can easily draw twenty gallons, several times what an efficient machine needs. Handwashing makes sense for a small, half-empty batch, provided you keep the faucet off while scrubbing. Also see how much energy does a desktop computer use.
The energy math backs this up. Heating tap water for a long handwashing session can use more energy than the machine's electricity and its smaller draw of hot water combined, because less hot water means less heater energy per load. A full, well-stacked machine therefore usually wins on energy use, while a half-empty one gives some of that advantage back, which is one more reason to wait until it is packed before you press start.
When you shop for a new unit, start with the yellow EnergyGuide label. It lists estimated annual electricity use and operating costs for both electric and natural gas water heaters, based on four loads each week at national average rates. Compare that to your own habits and local prices to see whether a given model beats your current one. For comparison, see how many watts does a water purifier use.
The ENERGY STAR logo goes a step further. Standard models must use less than 270 kWh per year and 3.5 gallons per cycle or fewer. A smart model that reports its own usage can also help, and an energy monitor or a smart plug on the outlet will show exactly what each load draws.
If your machine is more than a decade old, it may be worth an upgrade. An older unit pulling 1,900 watts for 2.5 hours and 10 gallons of hot water costs about $1.02 per load, or $266 a year at five loads each week, more than double the efficient example above.
A serviced, insulated water heater trims the heating energy added to every run, and a tankless unit avoids keeping a full tank warm between loads, so the dishwasher's electricity stays near the machine's own draw.
Knowing how much electricity a dishwasher draws is only useful when you set it against what your home uses overall. The average American home consumes close to 10,000 kWh a year, and the monthly figure moves with the season, the size of the house and the electricity rates your supplier charges. Our dishwasher running five times a week adds roughly 639 kWh to that total, so it represents a fairly small slice of the annual picture.
Find the per-kilowatt-hour price and the yearly kilowatt-hours on last year's statements, then multiply the dishwasher's roughly 639 kWh by that price. The result is the money the machine adds to your home's bill, and comparing it to the statement total tells you whether it deserves attention before the bigger consumers do. If your yearly total is 9,500 kWh, the dishwasher accounts for about seven percent of it.
A refrigerator never switches off, which makes it the natural benchmark for any kitchen. Most units draw between 300 and 800 watts while running but cycle on and off, so the refrigerator's consumption lands near 400 to 600 kWh a year for many homes. That is within the same range as the dishwasher estimate above, so if you wonder how much electricity a refrigerator uses compared with a dishwasher, the answer is often "about the same over a year."
Suppose an efficient replacement trims 1.1 kWh from every run, and your supplier charges $0.17 per kWh. That is about $0.19 saved each time, or roughly $49 a year at 260 runs. Over a ten-year lifespan the savings reach about $490, which is real money, though not enough on its own to replace a machine that still works well. Efficiency ratings pay back faster in a household that runs a load every night and more slowly if you run only a few each week, so a cheaper basic model can make sense for light use. Combine the electricity savings with lower water bills and the case improves, especially when your current machine is old.
Because the dishwasher is one lever among several, check how much electricity your home uses for laundry, heating and lighting too, and track your monthly bill across two or three billing periods to see whether a change worked.
It helps to keep the dishwasher in context. A refrigerator runs around the clock and usually accounts for about seven percent of a home's electricity. A washing machine and a dryer use more per household than a dishwasher because the dryer relies on heat. Heating and cooling account for the largest share of any utility costs in the home, and lighting adds around fifteen percent. Seen this way, a dishwasher is a modest line on the monthly bill, often smaller than the refrigerator's condenser fan and compressor combined. Next to a refrigerator, a clothes dryer or an air conditioner it is one of the cheaper appliances you own, so tune it up, but do not expect it to rescue a high electric bill on its own.
The same 1800 watts a typical dishwasher is rated for would also run a toaster oven, yet the dishwasher draws it only for a short stretch of each run, and its share is the easiest to shift to cheaper hours.