How to use the Energy Converter
- Enter a value in the “From” box
- Choose the units to convert from and to (or tap a quick unit)
- Read the result instantly; the table below shows the value in every unit
About this tool
A food “Calorie” (capital C) is a kilocalorie: 4,184 joules. Electricity is billed in kilowatt-hours (3.6 million joules). Gas and heating use BTU and therms (100,000 BTU ≈ 29.3 kWh). Converting everything to one unit lets you compare heating costs or see that a 2,000-kcal daily diet is about 2.3 kWh of energy.
Frequently asked questions
How many kJ are in a Calorie?
4.184 kJ per food Calorie (kcal).
How many BTU are in a kWh?
About 3,412 BTU.
Is a calorie the same as a Calorie?
No. A small calorie (cal) is 4.184 J. A food Calorie (kcal) is 1,000 times larger.
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