How to Use the Dishwasher vs Hand-Washing Cost Calculator
Whether to run the dishwasher or wash dishes by hand isn't just a convenience question — it changes how much you actually spend on electricity and water. This calculator multiplies your dishwasher's electricity and water use per load, and your hand-washing water use, by your local utility rates to project annual costs and show the true savings.
Dishwashers typically use far less water than hand-washing thanks to targeted spray jets and fixed cycles. A household running it once or twice a day can often save real money on water each year. That said, if your electricity rate is high or you're on a tiered pricing plan, the added electricity cost can offset — or even outweigh — the water savings, so it's worth running your own numbers.
Using an eco or water-saving cycle reduces water use further, and only running the dishwasher when it's full lowers the cost per load. On the other hand, running a half-empty dishwasher for just a few dishes can end up costing more than washing them by hand. Adjust the inputs above to match your household and see your actual savings.
Frequently Asked Questions
It depends on how often you run it and your electricity and water rates. Running it at least once a day usually saves water compared to hand-washing, but high electricity rates or infrequent use can shrink or reverse the savings.
It varies by model and cycle, but a typical load uses about 1 to 1.5 kWh. Eco or water-saving cycles tend to use slightly more electricity while using significantly less water.