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How much does a dishwasher cost to run?

A dishwasher typically draws around 1800 W while running. Ratings vary widely between models, so check the label and change the figure below.

per kWh
W
g CO2 per kWh
Cost per year
278.24
= Exact Running cost of a dishwasher
Cost per month
23.19
Cost per day
0.76
Cost per hour of use
0.50
Energy per year
993.7 kWh
Energy per day
2.7225 kWh
Carbon dioxide per year
248.4
Annual cost of standby alone
2.30
Show the working
  1. Power = 1800
  2. Hours per day = 1.5
  3. Days per year in use = 365
  4. Electricity price = 0.28
  5. Standby power = 1
  6. Grid carbon intensity = 250
  7. kw = 1800 / 1000 = 1.8
  8. daily_kwh = 1.8 * 1.5 = 2.7
  9. standby_kwh = 1 / 1000 * (24 - 1.5) = 0.0225
  10. Energy per day = 2.7 + 0.0225 = 2.7225
  11. Energy per year = 2.7225 * 365 = 993.713
  12. Cost per day = 2.7225 * 0.28 = 0.7623
  13. Cost per year = 993.713 * 0.28 = 278.24
  14. Cost per month = 278.24 / 12 = 23.1866
  15. Cost per hour of use = 1.8 * 0.28 = 0.504
  16. Carbon dioxide per year = 993.713 * 250 / 1000 = 248.428
  17. Annual cost of standby alone = 0.0225 * 365 * 0.28 = 2.2995

Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.

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    The formula

    • daily energy = power in kW x hours
    • annual cost = daily energy x days x price per kWh

    Nameplate wattage is the maximum draw, not the average. A cycling appliance like a fridge or a freezer averages far less.

    Standby draw is small per device and adds up across a house: ten devices at 2 W each is 175 kWh a year.

    Running cost of a dishwasher at different tariffs

    Price per kWh Per hour Per year at 1.5 h/day
    0.10 0.180098.55
    0.15 0.2700147.83
    0.20 0.3600197.10
    0.25 0.4500246.38
    0.30 0.5400295.65
    0.40 0.7200394.20

    Frequently asked

    How many watts does a dishwasher use?

    Typically around 1800 W while running, though models vary. Check the rating plate.

    How much electricity does it use per day?

    About 2.70 kWh at 1.5 hours of use.

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