Dishwasher Running Cost Calculator
Calculate what it costs to run your dishwasher — water, sewer, and electricity, per cycle and per year — and see how it compares with washing dishes by hand (running tap vs. two-basin).
See what it really costs to run your dishwasher — water, sewer, and electricity, per cycle and per year — and how that compares with washing the same dishes by hand. Enter your loads, your dishwasher's efficiency, and your utility rates.
Loads per week
How many times you run the dishwasher in a typical week. Most households run 4–7.
Dishwasher efficiency
ENERGY STAR (~3.5 gal & ~1.0 kWh per cycle), standard (~5 gal & ~1.5 kWh), or older pre-2013 unit (~8 gal & ~2.0 kWh). Newer units use far less of both.
Water + sewer rate
Your combined water and sewer cost per 1,000 gallons, from your utility bill. The U.S. average is roughly $10–$14 combined.
Electricity rate
What you pay per kilowatt-hour, from your electric bill. The U.S. average is around $0.17/kWh.
If you washed by hand instead (used for cost comparison to dishwasher below)
Running tap = washing under a continuously running faucet (water-heavy). Two-basin = filling one sink to wash and one to rinse (efficient). This sets the hand-washing comparison.
Dishwasher Running Cost
$82/yr
$0.32 per cycle · standard dishwasher
vs. hand-washing (running tap)
Your dishwasher is the cheaper way to wash
Running the tap to wash by hand is the most expensive way to do dishes. This dishwasher costs about $82/year to run and saves roughly 4,420 gallons and $84 a year versus washing by hand — and most of that saving is the energy you'd spend heating hand-wash water, not the water itself. Keep the edge: run full loads, skip pre-rinsing, and use the eco cycle.
The dishwasher's electricity figure includes its own internal water heating. The hand-washing comparison charges the energy to heat the wash water at your electricity rate (about 0.10 kWh per gallon) — if your water heater runs on gas, hand-washing energy costs less, so lower the comparison accordingly. Per-cycle water and energy vary by model, cycle, and soil level; figures exclude detergent and the water heater's standby losses. This is a planning estimate, not a metered measurement.
💡About this calculator▼
How much does it actually cost to run your dishwasher? Usually less than people think — but the answer depends on your dishwasher's efficiency, how often you run it, and your local water and electricity rates. This calculator gives you the real number, per cycle and per year, and then settles the age-old question: is the dishwasher cheaper than washing by hand?
Enter how many loads you run a week, pick your dishwasher's efficiency tier, and add your water/sewer and electricity rates from your bills. You'll get the running cost broken into water and electricity, plus a side-by-side comparison with hand-washing the same dishes.
The hand-washing comparison is the honest part. Against a continuously running tap, the dishwasher wins easily — and most of that saving is the energy you'd burn heating all that water, not the water itself. But against efficient two-basin hand-washing, the gap narrows, and an older dishwasher can actually cost more to run. The tool shows you which side you're really on.
The calculator works out two things: your dishwasher's running cost, and what hand-washing the same dishes would cost.
For the dishwasher, it uses a per-cycle water and electricity figure based on the efficiency tier you choose — ENERGY STAR units sip about 3.5 gallons and 1 kWh per cycle, standard units around 5 gallons and 1.5 kWh, and older pre-2013 units roughly 8 gallons and 2 kWh. It multiplies those by your loads per year, applies your water/sewer and electricity rates, and adds them up. (A dishwasher's electricity figure already includes its own internal water heating, which is most of its energy use.)
For the hand-washing comparison, it estimates the water you'd use — about 22 gallons per load under a running tap, or about 9 gallons filling two basins — plus the energy to heat that water (hand-washing uses warm water, and heating it is the bigger cost). Comparing the two annual totals gives you the gallons and dollars saved — or, in some cases, the gallons and dollars the dishwasher costs *more*. The formulas and a worked example are below.
📐How it's calculated▼
It's a per-cycle cost scaled to the year, with a parallel hand-washing total.
Dishwasher (per year): Water + sewer = (gal/cycle × loads/yr ÷ 1,000) × water-sewer rate Electricity = kWh/cycle × loads/yr × electricity rate Running cost = Water + sewer + Electricity
Per-cycle figures: ENERGY STAR 3.5 gal / 1.0 kWh · Standard 5 / 1.5 · Older 8 / 2.0
Hand-washing (per year): Water + sewer = (gal/load × loads/yr ÷ 1,000) × water-sewer rate Energy = gal/load × loads/yr × 0.10 kWh/gal × electricity rate (gal/load: running tap ≈ 22 · two-basin ≈ 9)
Comparison: Water saved = hand-wash gallons − dishwasher gallons Net cost saved = hand-wash cost − dishwasher cost
Example: 5 loads/week, standard dishwasher, $12/1,000 gal, $0.17/kWh, vs running tap
→ Dishwasher: 1,300 gal → ~$16 water + ~$66 electricity = about $82/year ($0.32/cycle)
→ Running-tap hand-washing: 5,720 gal → ~$69 water + ~$97 energy = about $166/year
→ You save ~4,420 gallons and ~$84 a year by using the dishwasher.
Switch the comparison to two-basin hand-washing and that same dishwasher actually costs a little more to run than washing by hand — which is exactly the kind of thing worth knowing.
📎Source:ENERGY STAR & U.S. DOE appliance water/energy data
🔍Finding your inputs▼
Loads per week: How many times you run the dishwasher in a typical week — most households land between 4 and 7. Run it only when full; a half-empty load costs nearly the same as a full one.
Dishwasher efficiency: Pick the tier that matches your unit. ENERGY STAR models (look for the label) use about 3.5 gallons and 1 kWh per cycle. A standard modern unit uses around 5 gallons and 1.5 kWh. An older dishwasher (roughly pre-2013) can use about 8 gallons and 2 kWh per cycle — meaningfully more of both. If you're not sure, "standard" is a safe middle estimate.
Water + sewer rate: Your combined cost per 1,000 gallons, from your utility bill. Add the water rate and the sewer rate (sewer is usually billed on metered water use). The U.S. average is roughly $10–$14 combined, but it varies a lot by city. If your bill lists CCF (1 CCF = 748 gallons), divide the CCF rate by 0.748 to get the per-1,000-gallon figure.
Electricity rate: What you pay per kilowatt-hour, on your electric bill. The U.S. average is around $0.17/kWh. This drives both the dishwasher's electricity and the energy side of the hand-washing comparison.
If you washed by hand instead: Choose running tap if you'd wash under a continuously running faucet — by far the most water- and energy-intensive method. Choose two-basin if you'd fill one sink to wash and one to rinse — the efficient approach that gives the dishwasher real competition. This sets the comparison; it doesn't change your dishwasher's cost.
⚠️Special situations▼
Is it cheaper to run the dishwasher or wash by hand?
It depends entirely on how you'd hand-wash. Against a continuously running tap, the dishwasher is clearly cheaper — often saving $80–$130 a year — because you avoid heating dozens of gallons of water per load. Against efficient two-basin washing (one sink to wash, one to rinse), it's roughly a tie, and an older, less-efficient dishwasher can actually cost a bit more to run. So the dishwasher's cost advantage is real if you'd otherwise leave the tap running, and marginal if you're a careful two-basin washer. Either way it saves you time, and running full loads tilts the math in its favor.
Does a dishwasher really save water versus hand-washing?
Yes, almost always on water volume. A modern dishwasher uses about 3–5 gallons per cycle, while hand-washing a comparable load under a running tap can use 20+ gallons, and even careful two-basin washing uses around 9. So the dishwasher saves water in every realistic comparison in this calculator — the gallons-saved figure is positive even when the dollar comparison is close. The reason the *cost* can still favor hand-washing is electricity: dishwashers heat water hot and run a dry cycle, so a less-efficient unit can spend more on energy than a frugal hand-washer saves on water.
Why is electricity a bigger part of the cost than water?
Because water is cheap and heating it is not. The water itself for a dishwasher cycle costs only a few cents, but running the unit — primarily its internal heater warming the water to sanitizing temperatures, plus the heated dry cycle — uses around 1–2 kWh, which at typical rates is the larger expense. This is also why the hand-washing comparison includes the energy to heat wash water: ignoring it would make hand-washing look artificially cheap. If you want to cut a dishwasher's running cost, skipping the heated-dry option (use air-dry) is the most direct lever.
My water heater runs on gas — does that change the comparison?
Yes, on the hand-washing side. This calculator charges the energy to heat hand-wash water at your electricity rate as a single, simple proxy. Gas is usually cheaper per unit of heat than electricity, so if you heat water with gas, hand-washing's energy cost is lower than shown — which narrows or reverses a close comparison. The dishwasher's own electricity figure is unaffected (it runs on electricity regardless). Treat tight comparisons as ballpark, and if you're gas-heated, lean toward the gallons-saved figure rather than the dollar figure as the cleaner signal.
How can I lower what my dishwasher costs to run?
Four easy levers: run only full loads (a half load costs nearly the same as a full one); skip the heated-dry cycle and let dishes air-dry or crack the door open; don't pre-rinse — modern detergents and dishwashers handle food residue, and pre-rinsing wastes hot water you're trying to save; and use the eco or normal cycle rather than heavy/sanitize unless you need it. Together these can meaningfully cut the electricity portion, which is the bigger half of the bill. Replacing a pre-2013 unit with an ENERGY STAR model also drops both water and energy per cycle substantially.
❓Common questions▼
How much does it cost to run a dishwasher?
For a typical household running about 5 loads a week, a modern dishwasher costs roughly $55–$85 a year to run — around $0.20–$0.35 per cycle — covering water, sewer, and electricity. An older, less-efficient unit can run closer to $120–$190 a year. Electricity (mostly heating the water inside) is usually the larger share; the water itself is only a few cents per cycle. Enter your loads, dishwasher efficiency, and local rates above for a figure tailored to you.
Is it cheaper to use a dishwasher or wash dishes by hand?
Against washing under a running tap, the dishwasher is clearly cheaper — typically saving $80 or more a year, mostly by avoiding the energy to heat 20-plus gallons of water per load. Against efficient two-basin hand-washing (fill one sink to wash, one to rinse), it's roughly even, and an older dishwasher can cost slightly more to run. So a modern dishwasher run on full loads is at least as cheap as careful hand-washing and much cheaper than wasteful hand-washing — plus it saves you the time. The calculator above shows your exact comparison.
How much water does a dishwasher use?
A modern dishwasher uses about 3 to 5 gallons per cycle — ENERGY STAR models around 3.5 gallons, standard units about 5. Older pre-2013 dishwashers use considerably more, often 8 gallons or more per cycle. By comparison, hand-washing a similar load under a running tap can use over 20 gallons. That's why a dishwasher saves water versus hand-washing in essentially every case — even careful two-basin hand-washing uses roughly 9 gallons, still more than a modern dishwasher.
How much electricity does a dishwasher use per cycle?
Most dishwashers use about 1 to 2 kWh per cycle, the bulk of it spent heating the water to wash and sanitize temperatures and running the heated-dry cycle. ENERGY STAR units are near the low end (~1 kWh), older units near the high end (~2 kWh). At an average $0.17/kWh that's roughly $0.17–$0.34 of electricity per load. Skipping the heated-dry option and using eco or normal cycles instead of sanitize trims this, which matters because electricity is usually the larger part of a dishwasher's running cost.
Does running the dishwasher only when full really save money?
Yes — it's the single best way to lower your cost per dish. A dishwasher uses nearly the same water and energy whether it's half full or full, so running full loads roughly halves the cost of cleaning each dish compared with running half-empty loads. Scrape food into the trash rather than pre-rinsing under hot water (which wastes the energy you're trying to save), skip the heated dry, and you'll get the lowest realistic running cost. The calculator's loads-per-week input shows how fewer, fuller loads reduce your annual total.
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