Calculators
Electricity Cost Calculator
What it costs to run an appliance
Result
Enter the values and the result will appear here.
Formula
P is power in watts, t is hours of use per day, R is the tariff per kWh, C is the cost, W is the use in kWh.
A finished calculation is added to the history automatically.
History
Entries: 0Nothing yet — finished calculations will appear here by themselves.
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Частые вопросы
Which formula gives the cost?
Cost = power (W) × hours per day × tariff (per kWh) / 1000. Dividing by 1000 converts watts to kilowatts.
Where do I find an appliance's power?
On the rating plate or in the manual. Appliances with a thermostat (a fridge, a heater) do not run all the time, so enter the average hours per day they are actually on.
Why is a month 30 days?
It is a convenient round figure; a year is 365 days. For an exact bill multiply the daily cost by the number of days you need.
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