Energy Converter

Convert between chemical, electrical and physical energy units.

Energy
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Related Conversions
1 kcal to kJ 5 kcal to kJ 25 kcal to kJ 100 kcal to kJ 250 kcal to kJ 264 kcal to kJ 396 kcal to kJ 1,320 kcal to kJ 2,500 kcal to kJ 3,300 kcal to kJ 6,600 kcal to kJ 50,000 kcal to kJ
Reverse Conversions
10 kJ to kcal 25 kJ to kcal 50 kJ to kcal 100 kJ to kcal 250 kJ to kcal 396 kJ to kcal 500 kJ to kcal 660 kJ to kcal 1,320 kJ to kcal 3,300 kJ to kcal 25,000 kJ to kcal 50,000 kJ to kcal
More Energy Conversions
100 J to cal 1 GJ to kWh 1 GJ to MJ 1 MJ to BTU 250 cal to J 1 MJ to kWh 2 GJ to MJ 2 MJ to BTU 500 cal to J 1 kWh to cal

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Popular Conversions

Kilowatt-Hours to Megajoules Megajoules to Kilowatt-Hours Joules to Calories Kilocalories to Kilojoules British Thermal Units to Joules Watt-Hours to Joules

Common Benchmarks

Boil 1 liter water 334 kJ
Gasoline liter 34 MJ
Phone battery 40 kJ
AA battery 10 kJ
Match stick 1 kJ
1 kWh 3.6 MJ

Formula

kJ = kcal × 4.184

Example

Example: convert 330 kilocalories to kilojoules.

330 kcal = 1380.72 kJ

Conversion table

kilocalories (kcal) kilojoules (kJ)
1 kcal 4.184 kJ
2 kcal 8.368 kJ
5 kcal 20.92 kJ
10 kcal 41.84 kJ
20 kcal 83.68 kJ
50 kcal 209.2 kJ
100 kcal 418.4 kJ

Explanation

These are both units.

How to convert kilocalories to kilojoules

  1. Start with the value in kilocalories (kcal).
  2. Multiply it by 4.184.
  3. The result is the measurement in kilojoules (kJ).

Example: 330 kcal → 1380.72 kJ

Frequently Asked Questions

How much is 330 kilocalories in kilojoules?

330 kilocalories equals 1380.72 kilojoules.

How many kilojoules is 1 kilocalorie?

1 kilocalorie equals 4.184 kilojoules.

How many kilocalories is 1 kilojoule?

1 kilojoule equals 0.239005736138 kilocalories.

What is the difference between kilocalories and kilojoules?

Both measure energy in SI. The main difference is usually scale: some units are convenient for smaller values, while others are used to express larger values more practically.

Where are kilocalories and kilojoules used?

They are used in physics and engineering to measure work, energy, and heat; the most practical unit depends on the magnitude.

Why does 1 kilocalorie equal 4.184 kilojoules?

Because the units are defined with a fixed relationship. To convert kilocalories to kilojoules, multiply by that factor.