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 100 kcal to kJ 2,500 kcal to kJ 5,000 kcal to kJ 25,000 kcal to kJ 32,000 kcal to kJ 36,000 kcal to kJ 48,000 kcal to kJ 50,000 kcal to kJ 64,000 kcal to kJ 100,000 kcal to kJ
Reverse Conversions
25 kJ to kcal 50 kJ to kcal 100 kJ to kcal 250 kJ to kcal 2,500 kJ to kcal 10,000 kJ to kcal 32,000 kJ to kcal 36,000 kJ to kcal 64,000 kJ to kcal 96,000 kJ to kcal 400,000 kJ to kcal 800,000 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 250 cal to J 1 MJ to kWh 2 GJ to MJ 10 BTU to J

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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

100 W bulb for 1 hour 0.1 kWh
Phone battery 40 kJ
AA battery 10 kJ
1 kWh 3.6 MJ
Food calorie 4184 J
Match stick 1 kJ

Formula

kJ = kcal × 4.184

Example

Example: convert 40000 kilocalories to kilojoules.

40000 kcal = 167360 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: 40000 kcal → 167360 kJ

Frequently Asked Questions

How much is 40000 kilocalories in kilojoules?

40000 kilocalories equals 167360 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.