Energy Converter

Convert between chemical, electrical and physical energy units.

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Related Conversions
1 kcal to kJ 5 kcal to kJ 25 kcal to kJ 50 kcal to kJ 360 kcal to kJ 495 kcal to kJ 900 kcal to kJ 1,800 kcal to kJ 2,500 kcal to kJ 4,500 kcal to kJ 10,000 kcal to kJ 100,000 kcal to kJ
Reverse Conversions
5 kJ to kcal 25 kJ to kcal 250 kJ to kcal 360 kJ to kcal 495 kJ to kcal 720 kJ to kcal 900 kJ to kcal 1,000 kJ to kcal 1,080 kJ to kcal 9,000 kJ to kcal 10,000 kJ to kcal 25,000 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

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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

Match stick 1 kJ
Slice of bread 330 kJ
Food calorie 4184 J
Laptop full charge 200 kJ
Boil 1 liter water 334 kJ
Phone battery 40 kJ

Formula

kJ = kcal × 4.184

Example

Example: convert 450 kilocalories to kilojoules.

450 kcal = 1882.8 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: 450 kcal → 1882.8 kJ

Frequently Asked Questions

How much is 450 kilocalories in kilojoules?

450 kilocalories equals 1882.8 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.