Energy Converter
Joules, calories, kWh, BTU and foot-pounds.
Your result appears here
Fill in the fields on the left and press Calculate. The answer, the breakdown and a copy button all land in this card.
How it is calculated
Convert the input to joules, then divide by the target unit's joule value.
A food "calorie" on a nutrition label is a kilocalorie: 1 kcal = 4,184 joules.
Worked example
2,000 kcal × 4,184 = 8,368,000 joules, which is 8,368 kJ or about 2.32 kWh.
Questions people ask
Nutrition labels write "calories" but mean kilocalories. A 500-calorie meal is 500 kcal, or 2,092 kJ.
3.6 million joules — one 1,000 watt appliance running for an hour. It is also the unit your electricity bill charges by.