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What it is
Energy Converter turns joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours and BTU into each other as you type. A 200-Calorie snack equals about 836.8 kJ, and 1 kWh equals about 860.42 kcal: useful for reading nutrition labels, electricity bills or technical specs given in different units. Calorie (cal) and kilocalorie (kcal) are kept explicitly distinct here — the common mistake is confusing the small chemical calorie (cal, 4.184 J) with the food Calorie on nutrition labels, which is always actually a kilocalorie (1 kcal = 1000 cal).
- From joules to BTU: 7 units, from physics to nutrition labels to electricity bills
- 200 Cal ≈ 836.8 kJ, 1 kWh ≈ 860.42 kcal: food energy and electrical energy compared directly
- Linked to the power converter: 1 kWh is the energy delivered by 1 kW over one hour, convert both with the same tool
How it works
Pick the starting unit
Choose from J, kJ, cal, kcal, Wh, kWh or BTU.
Type the value
Enter the number to convert: the result in the other unit appears instantly.
Check the common table
Below the result you'll find standard multiples already converted, useful for comparing typical energy values.
Features
cal and kcal, kept distinct
The calorie (cal, 4.184 J) and the kilocalorie (kcal, 4184 J) are explicitly separated here: nutrition labels always use kcal, even when they just say "Calories" — a common mistake this tool avoids.
Electrical vs food energy compared
1 kWh (the unit on your electricity bill) equals about 860.42 kcal (the unit on nutrition labels): a comparison rarely offered by generic converters.
Common conversions table
Standard multiples (100, 500, 1000 kcal...) already calculated below the result, for quick comparisons without a calculator.
Linked to the power converter
Energy and power are related (kWh = kW × hours): also use the power converter for hp, CV/PS and other power units.
FAQ
The calorie (cal) is a small physical unit (4.184 J); the Calorie on nutrition labels, even when written with a lowercase "c", is always a kilocalorie (1 kcal = 1000 cal = 4184 J). It's the most common conversion mistake in this area.
About 119.5 kcal (500 ÷ 4.184).
Exactly 1 kWh: 1000 Wh and 1 kWh are the same amount of energy, just written in different units.
About 860.42 kcal (3,600,000 J ÷ 4184 J).
It's not a direct conversion: power is energy divided by time. Use this tool for energy (kWh, kcal...) and the power converter for hp, kW and CV/PS.