Energy Converter
Convert energy values between joules, kilojoules, calories, kilocalories, kilowatt-hours, and BTU instantly. Enter a value in any unit and see all the equivalents — useful for physics, nutrition, and engineering.
Result will appear here.
How to use
- Enter a value or select an option.
- Choose the From and To units — the result updates live.
- See the converted values in all units below as well.
Good to know
- One kilowatt-hour equals 3.6 million joules.
- Food calories on labels are actually kilocalories.
- BTU is common in air-conditioner and heater ratings.
- Keep track of decimal places when converting for lab work.
Note: 1 electricity bill unit = 1 kWh = 3600 kJ.
Frequently Asked Questions (FAQ)
Which units can the energy converter convert?
Joules, kilojoules, calories, kilocalories, kilowatt-hours and BTU — all at once from a single entered value.
How many kilojoules are in one electricity bill unit?
One bill unit equals 1 kWh, which is 3600 kJ.
Does it handle food calories too?
Yes — it converts calories and kilocalories. Note that the calories on food labels are actually kilocalories.
Can I type the value in any unit?
Yes. Enter the value in any unit and the equivalents in all other units appear immediately.