Power Converter
Convert between watts, kilowatts, megawatts, horsepower, BTU/hr, foot-pounds/sec, calories/sec, and more. Enter any value and all units update in real time.
Convert power
Quick references
Full conversion table
Enter a power value above to see all conversions.
Running cost calculator
Estimate how much it costs to run an appliance at your power rating.
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Daily cost
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Monthly cost
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Annual cost
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UK Ofgem price cap rate: ~24.5p/kWh (2025). Check your bill for your exact tariff.
Common appliance power ratings
Typical wattages for household appliances — click any row to load it into the converter.
Real-world power reference
From a single LED to the Sun itself.
Types of horsepower
There are several definitions of "horsepower" — here's how they differ.