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Energy Converter

Food labels, energy bills and heating. Type a value in either box.

Popular conversions

kcal to kJkJ to kcalkWh to BTU

Energy facts

Food "calories" are kilocalories: 1 kcal is 4.184 kJ. Energy bills use kilowatt-hours; 1 kWh is 3,412 BTU. UK gas used to be billed in therms, and 1 therm is about 29.3 kWh.

Frequently asked questions

How many kJ in a calorie?

1 kcal is 4.184 kJ.

How many kWh in a therm?

About 29.31 kWh.