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Energy converter
Convert energy units units online, free and without signing up: kilocalories (kcal), kilojoules (kJ) and kilowatt hours (kWh). Type a value and the result appears as you type, together with the value in every other unit. Nothing is uploaded: the calculation runs in your browser.
How to use the Energy converter
- 1Type your value in the “Value” field
- 2Choose the units in “From” and “To”
- 3Read the result and the table of all units
- One result, and the value in every unit.
What happens to your numbers
- Nothing is uploaded.The calculation runs in your browser, on your own device.
- Every unit at once.A table shows your value in all the other energy units.
- Works offline.Once the tool has been opened, it needs no connection.
What you can do
- Convert between every pair of the units with one input: “From” and “To” can be any of them.
- See your value in every energy unit at once in the table below the result.
- Press “Swap” to turn the conversion around.
- Type decimals or negative numbers and see the result as you type.
Good to know
- The kilocalorie is the thermochemical one: 1 kcal is exactly 4.184 kJ. One kWh is 3,600 kJ, about 860 kcal.
- Results are shown with up to 10 significant digits. Very large or very small numbers appear in exponent form, for example 1.5e+16.
Questions
Are my values sent to a server?
No. The calculation runs in your browser, on your own device. Nothing you type is sent to us or anyone else.
How do I switch the direction?
Press “Swap”. “From” and “To” change places and the result updates.
How many kilojoules are in a kilocalorie?
One kilocalorie is 4.184 kilojoules. To go from kcal to kJ, multiply by 4.184. To go back, divide by 4.184.