Convert energy units
Enter a value, choose the starting unit, choose the target unit, then convert. Results are calculated through joules as the base unit.
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Common energy conversions
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Converter
Energy Converter
Convert energy units between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, therms, foot-pounds, and more.
About this energy converter
This energy converter helps compare common energy units used in electricity, heating, batteries, nutrition labels, physics, engineering, and technical planning. It can convert between SI units, electrical energy units, heat energy units, and mechanical work units.
Joules
Joules are the SI unit of energy. Kilojoules and megajoules are common larger versions used in science, engineering, and energy references.
Watt-hours
Watt-hours and kilowatt-hours are commonly used for electricity, batteries, solar systems, appliances, and power usage estimates.
Calories and BTU
Calories and kilocalories are often used for food energy. BTU and therms are often used for heat, HVAC, gas usage, and heating comparisons.
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