Energy Converter

Convert between chemical, electrical and physical energy units.

Energy
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Related Conversions
10 kcal to kJ 228 kcal to kJ 250 kcal to kJ 304 kcal to kJ 500 kcal to kJ 1,000 kcal to kJ 1,012 kcal to kJ 2,500 kcal to kJ 2,530 kcal to kJ 5,000 kcal to kJ 5,060 kcal to kJ 25,000 kcal to kJ
Reverse Conversions
100 kJ to kcal 202 kJ to kcal 228 kJ to kcal 405 kJ to kcal 500 kJ to kcal 607 kJ to kcal 1,000 kJ to kcal 5,000 kJ to kcal 5,060 kJ to kcal 10,000 kJ to kcal 25,000 kJ to kcal 50,000 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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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
Boil 1 liter water 334 kJ
Cup of coffee 5 kJ
Microwave 10 minutes 0.17 kWh
1 kWh 3.6 MJ
AA battery 10 kJ

Formula

kJ = kcal × 4.184

Example

Example: convert 253 kilocalories to kilojoules.

253 kcal = 1058.552 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: 253 kcal → 1058.552 kJ

Frequently Asked Questions

How much is 253 kilocalories in kilojoules?

253 kilocalories is about 1058.55 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.