Energy Converter

Convert between chemical, electrical and physical energy units.

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Related Conversions
1 cal to J 10 cal to J 25 cal to J 50 cal to J 100 cal to J 250 cal to J 500 cal to J 5,000 cal to J 10,000 cal to J 25,000 cal to J 50,000 cal to J 100,000 cal to J
Reverse Conversions
1 J to cal 5 J to cal 10 J to cal 25 J to cal 250 J to cal 500 J to cal 1,000 J to cal 2,500 J to cal 5,000 J to cal 10,000 J to cal 25,000 J to cal 50,000 J to cal
More Energy Conversions
1 GJ to kWh 1 GJ to MJ 1 MJ to BTU 100 J to cal 1 MJ to kWh 2 GJ to MJ 2 MJ to BTU 100 kJ to kcal 1 kWh to cal 10,000 J to kJ

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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

Match stick 1 kJ
Microwave 10 minutes 0.17 kWh
AA battery 10 kJ
Slice of bread 330 kJ
1 kWh 3.6 MJ
Boil 1 liter water 334 kJ

Formula

J = cal × 4.184

Example

Example: convert 2500 calories to joules.

2500 cal = 10460 J

Conversion table

calories (cal) joules (J)
1 cal 4.184 J
2 cal 8.368 J
5 cal 20.92 J
10 cal 41.84 J
20 cal 83.68 J
50 cal 209.2 J
100 cal 418.4 J

Explanation

These are both units.

How to convert calories to joules

  1. Start with the value in calories (cal).
  2. Multiply it by 4.184.
  3. The result is the measurement in joules (J).

Example: 2500 cal → 10460 J

Frequently Asked Questions

How much is 2500 calories in joules?

2500 calories equals 10460 joules.

How many joules is 1 calorie?

1 calorie equals 4.184 joules.

How many calories is 1 joule?

1 joule equals 0.239005736138 calories.

What is the difference between calories and joules?

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 calories and joules 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 calorie equal 4.184 joules?

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