Energy Converter
Convert between joules, calories, kilowatt-hours and BTUs with live results.
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About Energy conversion
Energy shows up on food labels, electricity bills and heater specs, each with its own unit. Fiction Units converts between joules and kilojoules (scientific), calories and kilocalories (food), watt-hours and kilowatt-hours (electricity) and BTUs (heating).
Food calories are kilocalories, the 200 kcal on a snack label is 200,000 small calories, and 1 kWh is 3.6 megajoules, the same energy as running a 1,000-watt heater for an hour.
Units supported: Joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTUs.
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Frequently asked questions
What units can I convert with the Energy converter?
Joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTUs.
How accurate is this energy converter?
This converter uses standard international definitions for every energy unit, so results are precise to several decimal places, accurate enough for cooking, travel, homework, or any everyday use.
Can I convert in both directions?
Yes, enter a value in either field and the other updates instantly. You can also tap the swap button to flip the two units, or use the copy-link button to share this exact conversion.