Cost to run a dishwasher: per cycle, and versus washing up

The dishwasher has a reputation for expense that the numbers do not support. A modern machine on an eco cycle uses roughly 0.8-1.5 kWh per cycle - about 15-30 cents or 15-30p at average US/UK rates - plus a small amount for water heating if your machine draws hot water from the tank. A daily-dishwashers household spends in the region of 5-9 a month on cycles. Price your own machine's label figure at your own rate with the electricity cost calculator.

The hand-washing comparison

Done honestly - hot tap running, rinsing under the stream - hand-washing a full load's worth of dishes typically uses markedly more hot water and energy than the machine, which is why efficiency agencies keep concluding that a full dishwasher usually wins on both energy and water. The caveats decide it: the machine wins when it is full (halving the loads halves the cost), when you skip the pre-rinse (modern detergents want dirty plates; rinsing first just doubles the water), and when the machine is the modern efficient kind - a 25-year-old dishwasher is a different animal, the repair-or-replace arithmetic applies.

The cheap wins

Run eco mode as the default - it stretches cycle time to cut energy, which is the right trade for most households. Keep the filter clean and the spray arms clear (a machine quietly choking costs more per cycle - the drainage checks cover the failure mode). Load it properly so you never re-wash: the loading guide is the highest-yield five minutes here. And if you are on a time-of-use tariff, the delay button moves the cycle into the cheap hours - the tariff logic applied to the easiest appliance in the house.