Unit Converters
Energy Converter
Energy Converter switches an amount of energy between joules, calories, kilocalories, watt-hours, kilowatt-hours and BTU.
Useful for comparing food-energy labels (kcal), electricity usage (kWh) and physics or engineering calculations (J, BTU) side by side.
How to Use the Energy Converter
- Open the Energy Converter tool.
- Enter the energy value you want to convert.
- Choose the unit you're converting from.
- Choose the unit you want to convert to.
- Read the converted result, updated instantly.
Frequently Asked Questions
What's the difference between calories and kilocalories?
1 kilocalorie (kcal) equals 1000 calories (cal). Nutrition labels almost always use kilocalories, even when they just say "Calories".
How is a kilowatt-hour related to my electricity bill?
Utility companies bill by the kilowatt-hour (kWh), which is the amount of energy 1 kilowatt of power delivers over one hour.
Is my data sent anywhere?
No, all conversions happen locally in your browser -- nothing is uploaded.
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