From watts to monthly cost
Cost = (watts ÷ 1,000) × hours/day × days × price/kWhDividing watts by 1,000 gives kilowatts. Kilowatts multiplied by hours gives the energy consumed in kWh.
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Appliance electricity cost
See its real impact on your energy bill
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RELATED GUIDE
Want to understand this calculation?
Read the full explanation with the method, a checkable example, limits and common mistakes.
HOW IT WORKS
A result to understand, not just read.
Appliance running cost depends on power, operating time and the price paid per kWh. For a useful estimate, enter an all-in average unit price from a recent bill rather than only the advertised energy component.
OFFICIAL SOURCES
arera.it↗FREQUENTLY ASKED QUESTIONS
Should I use the wattage on the rating plate?+
It is a reasonable starting point, but thermostatic and inverter appliances often draw less than their maximum rating for part of the cycle.
Does the result include fixed charges?+
No. It estimates usage-related energy cost; standing charges and other bill components are not allocated to one appliance.
RESULT GUIDE
How to estimate an appliance’s electricity cost
Convert watts to kilowatts, multiply by hours of use to obtain kWh, then multiply by the price paid for each kWh.
Example: a 1,200 W appliance
- power: 1,200 W
- use: 3 hours a day for 30 days
- electricity: €0.32/kWh
A thermostatic or inverter appliance may operate below maximum power for part of the time.
How to interpret the result
- Compare scenarios by changing the hours first; usage time often matters more than a small wattage difference.
- For appliances with variable cycles, a measured average power gives a better estimate.
What the estimate does not include
- It does not break down standing charges, taxes or time-of-use tariffs.
- A plug-in energy meter is needed for a precise appliance-level measurement.
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