A per-load breakdown of dishwasher electricity, water and detergent costs, plus how your machine choice and settings change the total compared with washing everything by hand.
What to remember
- A standard ENERGY STAR dishwasher uses no more than 240 kWh per year and 3.2 gallons per cycle, which works out to about 20 cents of electricity per load at the average U.S. rate.
- ENERGY STAR estimates a standard-size certified dishwasher costs about $50 per year to run, roughly 23 cents across the 215 cycles per year used in federal testing.
- Washing dishes in a new ENERGY STAR dishwasher instead of by hand can cut utility bills by about $220 per year, or $3,300 over the machine’s lifetime.
- Dishwashers made before 1994 cost an extra $35 a year on utility bills compared with a new certified model.
- Turning off heated dry, using light cycles for lightly soiled dishes and running full loads all cut costs without hurting results.
A dishwasher load carries three price tags: the electricity that runs the pump and heater, the water sprayed over the dishes, and the detergent and rinse aid you add yourself. For most families the total is lower than they expect, and lower than washing every dish by hand. Here is what each cost depends on, and where a few settings make a real difference.
The Three Costs Behind Every Dishwasher Load
Dishwashers consume energy in three ways, according to the Department of Energy’s test procedure: operating the machine, heating the water, and drying the dishes. That breakdown is useful because two of the three are partly under your control. Drying can be skipped on most machines, and the amount of hot water a cycle uses depends on which cycle you pick.
Water is the second cost. The gallons per cycle are fixed by the machine’s design, but your local water and sewer rates decide what those gallons cost you. If your utility charges for water delivered and also bases sewage charges on usage, both grow with every cycle.
Detergent and rinse aid are the third cost, and they are the most personal one. What you spend depends on the type of detergent, the dose per load and whether you use rinse aid at all. This is also where overuse is common. More detergent does not clean better, and too much can leave residue on dishes.
Your Electricity Rate Changes the Answer
The same dishwasher costs different amounts to run depending on where you live. Data from the U.S. Energy Information Administration puts the average residential electricity rate at 18.16 cents per kilowatt-hour. The spread across states is wide: Nevada had the lowest average residential rate at 12.72 cents per kilowatt-hour, while Hawaii had the highest at 47.18 cents, with Maine second at 32.11 cents. Texas sat at 15.91 cents, below the national average.
Water rates vary too, and sewer charges add to the bill. The Department of Energy’s federal purchasing guidance calculates dishwasher costs using an assumed electricity price of 9 cents per kilowatt-hour, which shows how much lower rates can run in some places.
The practical step is simple: find the rate printed on your own utility bill, usually shown as cents per kilowatt-hour, and use that number instead of a national average. A family in Hawaii and a family in Nevada running identical machines will not see identical bills.
What a Standard Model Uses Per Load
The ENERGY STAR program sets maximum usage levels for certified dishwashers, with criteria effective July 19, 2023. A standard-size certified model must use no more than 240 kilowatt-hours per year and 3.2 gallons per cycle. A compact model must stay under 155 kilowatt-hours per year and 2.0 gallons per cycle.
The certification math assumes 215 cycles per year, which is roughly four loads a week. Divide a standard model’s 240 kilowatt-hours by 215 cycles and you get about 1.1 kilowatt-hours per load. At the national average rate of 18.16 cents, that is roughly 20 cents of electricity per cycle. A compact model works out to about 0.7 kilowatt-hours per load, or around 13 cents at the same rate.
Electricity alone is not the whole story, because the machine also uses water. ENERGY STAR estimates that a standard-size certified dishwasher costs about $50 per year to run. Divided across 215 cycles, that works out to about 23 cents per load for running the machine, with your local water rates deciding where the exact number lands.
| Model size | Annual energy limit | Water limit per cycle | Electricity per cycle at the U.S. average rate |
|---|---|---|---|
| Standard | 240 kWh | 3.2 gallons | about 20 cents |
| Compact | 155 kWh | 2.0 gallons | about 13 cents |
One caveat on size: a standard-capacity model holds more than eight place settings and six serving pieces, while a compact model holds less. Because a compact machine fits fewer dishes, it may need to run more often, and ENERGY STAR notes that compact models can use more energy over time as a result.
Parent tip: Check the yellow EnergyGuide label on the showroom floor or the product page. It shows the estimated yearly electricity use and estimated yearly operating cost for that specific model, which makes side-by-side comparisons far easier than parsing spec sheets.
Dishwasher vs. Hand Washing: Which Costs More?
Hand washing feels free, but it draws hot water the whole time you work, and hot water is what you pay for. ENERGY STAR estimates that washing dishes in a new certified dishwasher instead of by hand can cut utility bills by about $220 per year, adding up to $3,300 over the machine’s lifetime. The same comparison credits certified dishwashers with saving about 5,800 gallons of water over their lifetime compared with hand washing.
The gap widens with older machines or older habits. Commonly cited figures put older dishwashers at 10 to 15 gallons per load, while new certified models use around 5.5 gallons. A family of four typically runs about 150 loads per year, or roughly 1,800 gallons of water. Upgrading from an old machine to an efficient one can cut water use by nearly 1,000 gallons a year, before counting the energy saved by heating less water.
Time is the third cost, and it is the one parents feel most. One commonly cited estimate puts the time savings from using a dishwasher at over 230 hours per year compared with washing everything by hand, close to ten full days. Yet roughly 20 percent of dishwasher owners run their machine less than once a week, often washing by hand instead and missing those savings.
Detergent, Rinse Aid and Repairs
Detergent pricing is not printed on any federal label, so the honest answer is that this cost varies by format and household. Detergent comes as pods, gels and powders, and rinse aid is a separate purchase. Two habits push this cost up without improving results: using more detergent than the dose calls for, and paying for rinse aid in a household that never notices a difference. Single-dose pods make overdosing harder but tend to cost more per load than powder or gel you measure yourself.
Repairs are the cost nobody plans for. A machine out of warranty can turn a 23-cent load into an expensive service call, so it is worth knowing what coverage you have before something breaks. Our guide to how product warranties work explains what full and limited warranties have to cover and how to file a claim. If a repair quote approaches the price of a new efficient model, replacement usually makes more sense.
Settings That Cut the Cost Without Hurting Results
Modern machines include several features designed to reduce what each load consumes. If your current dishwasher has them, using them costs nothing:
- Soil sensors. An auto-sensing cycle detects whether the water running off the dishes is still dirty and adjusts accordingly, which saves water and helps dishes come out clean.
- Light cycles. If dishes are only slightly soiled, a light cycle uses less water than a heavy one.
- Heated dry off. Turning off heated drying cuts the energy that goes into the drying stage. Dishes may need a little longer to air dry inside the machine.
- Energy-saving wash. Some models offer a specific energy-saving cycle; the manual will tell you what it changes.
Two habits matter as much as any setting. Run full loads, since each cycle’s energy and water cleans more dishes when the racks are full. And skip the pre-rinse: soil sensors and modern detergents are designed to work with some food residue, so rinsing first mostly wastes hot water.
When Replacing an Old Dishwasher Pays Off
Federal efficiency standards for residential dishwashers have applied since 1988, so even a basic new machine meets a floor that older models never did. Dishwashers made before 1994 cost an extra $35 a year on utility bills compared with a new ENERGY STAR model, and their higher water use shows up on the water bill too. New Department of Energy standards are also expected to save consumers about $168 million per year on utility bills.
How much extra is an efficient model worth? The Department of Energy’s federal purchasing program calculates that an ENERGY STAR-qualified residential dishwasher pays for its premium if it costs no more than $94 more than a less efficient model, in 2022 dollars. The best available model saves up to $136 in lifetime utility costs. Rebates can shrink that gap further; ENERGY STAR partners sponsor rebates on certified products, so check with your utility before you buy.
Before you commit, look past marketing claims by using our tips for spotting fake reviews. And if a store is advertising a steep discount, our guide to telling whether a sale price is really a deal helps you judge it against real prices rather than an inflated list price. A cheaper machine that uses more water and electricity is not always the better buy over the years you will own it.
Parents also ask
How much electricity does one dishwasher load use?
A standard ENERGY STAR model is limited to 240 kilowatt-hours per year, and federal testing assumes 215 cycles per year. That works out to about 1.1 kilowatt-hours per load, or roughly 20 cents at the average U.S. residential rate of 18.16 cents per kilowatt-hour.
Is it cheaper to wash dishes by hand?
Usually not. ENERGY STAR estimates that using a new certified dishwasher instead of hand washing cuts utility bills by about $220 per year, and older dishwashers using 10 to 15 gallons per load still beat hand washing on water use.
How much extra should I pay for an efficient dishwasher?
The Department of Energy’s federal purchasing guidance calculates that an ENERGY STAR-qualified dishwasher pays for itself if priced no more than $94 above a less efficient model, in 2022 dollars. The best available model saves up to $136 in lifetime utility costs.
Does the dish size of the machine matter?
Yes. A standard-capacity model holds more than eight place settings and six serving pieces, while a compact model holds less. Because compact machines fit fewer dishes, they may run more often and can use more energy over time.
This guide is general information for U.S. shoppers, not legal advice. Safety rules and store policies change, so follow the product’s instructions and labels and check official sources such as CPSC.gov, NHTSA.gov and FTC.gov.