Energy Converter

Convert between chemical, electrical and physical energy units.

Energy
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Related Conversions
1 kcal to kJ 50 kcal to kJ 100 kcal to kJ 273 kcal to kJ 485 kcal to kJ 727 kcal to kJ 1,000 kcal to kJ 2,500 kcal to kJ 6,060 kcal to kJ 10,000 kcal to kJ 50,000 kcal to kJ 100,000 kcal to kJ
Reverse Conversions
25 kJ to kcal 50 kJ to kcal 273 kJ to kcal 606 kJ to kcal 1,000 kJ to kcal 1,212 kJ to kcal 2,500 kJ to kcal 3,030 kJ to kcal 5,000 kJ to kcal 10,000 kJ to kcal 25,000 kJ to kcal 100,000 kJ to kcal
More Energy Conversions
1 MJ to BTU 100 J to cal 1 GJ to kWh 1 GJ to MJ 2 MJ to BTU 100 kJ to kcal 1 MJ to kWh 2 GJ to MJ 10 BTU to J 250 cal to J

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Common Benchmarks

Laptop full charge 200 kJ
Microwave 10 minutes 0.17 kWh
Phone battery 40 kJ
1 kWh 3.6 MJ
AA battery 10 kJ
Food calorie 4184 J

Formula

kJ = kcal × 4.184

Example

Example: convert 303 kilocalories to kilojoules.

303 kcal = 1267.752 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: 303 kcal → 1267.752 kJ

Frequently Asked Questions

How much is 303 kilocalories in kilojoules?

303 kilocalories is about 1267.75 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.