Appliance Electricity Cost Calculator
Curious what an appliance really costs in electricity? Enter the power draw, how many hours a day it runs and your electricity price for a monthly and yearly estimate.
Result
£4.50
Cost per month
- Cost per year
- £54.00
How this was calculated
- 1Monthly use in kWh(100 ÷ 1000) × 5 × 30 = 15 kWh
Formula
Cost = (watts ÷ 1000) × hours per day × days per month × price per kWh
Power in watts is converted to kilowatts by dividing by 1000. Multiplied by the running hours, you get consumption in kWh, which you multiply by your price per kWh for the cost.
Worked examples
A 100 W appliance, 5 hours a day, € 0.30/kWh
→ € 4.50 per month.
Common mistakes
- Confusing watts and kilowatts, making the result 1000 times too high or too low.
When to use it
- Assessing whether a more energy-efficient appliance is worth the investment.
Frequently asked questions
Where do I find my appliance’s power draw?
Usually on the appliance’s rating plate or in the manual, listed in watts (W).
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