Kettle Running Cost Calculator UK
Calculate how much it costs to boil your electric kettle using its wattage, boil time and your electricity rate.
The calculator defaults to 26.11p per kWh, the Ofgem average electricity unit rate for a standard variable tariff paid by Direct Debit from 1 July to 30 September 2026. Your own tariff may be different.
View Ofgem electricity rates →Calculate Your Kettle Running Cost
Your Estimated Running Costs
Usage Summary
Estimated annual use: —
Estimated electricity use per year: —
Estimated electricity per use: —
How is the cost calculated?
Rated power in watts is converted to kilowatts, then multiplied by the time used in hours. That gives an estimated kWh figure for one use.
This is a simple estimate. Appliances with thermostats or variable power may draw less than their maximum rated wattage for part of the time.
Frequently Asked Questions
Does filling the kettle with more water cost more?
Usually yes, because heating a larger volume of water requires more energy and often takes longer.
Where can I find kettle wattage?
It is usually printed on the rating label under the kettle or base, and often appears in the product specification.
Why is this an estimate?
Kettles switch off automatically and real heating time varies with water volume, starting temperature and efficiency.
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