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Unit Conversion Calculators
Energy Converter
Convert an amount of energy between joules, kilojoules, calories, kilowatt-hours and British thermal units (BTU).
Converted value
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About the Energy Converter
Energy is measured differently across science, nutrition and utility billing — joules in physics, calories in food energy, kilowatt-hours on electricity bills, and BTU in heating and cooling systems. This converter routes every unit through joules, the SI unit of energy.
Formula: Result = (Value × Factorfrom→J) ÷ Factorto→J, where 1 kWh = 3,600,000 J and 1 BTU = 1,055.06 J
Useful for comparing appliance energy use, food calorie labels and HVAC ratings that use different energy units.
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