Energy Converter

Convert between chemical, electrical and physical energy units.

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

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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

100 W bulb for 1 hour 0.1 kWh
Slice of bread 330 kJ
1 kWh 3.6 MJ
Gasoline liter 34 MJ
AA battery 10 kJ
Food calorie 4184 J

Formula

cal = J × 0.2390057361

Example

Example: convert 250 joules to calories.

250 J = 59.75143403 cal

Conversion table

joules (J) calories (cal)
1 J 0.23900574 cal
2 J 0.47801147 cal
5 J 1.19502868 cal
10 J 2.39005736 cal
20 J 4.78011472 cal
50 J 11.95028681 cal
100 J 23.90057361 cal

Explanation

These are both units.

How to convert joules to calories

  1. Start with the value in joules (J).
  2. Multiply it by 0.2390057361.
  3. The result is the measurement in calories (cal).

Example: 250 J → 59.75143403 cal

Frequently Asked Questions

How much is 250 joules in calories?

250 joules is about 59.7514 calories.

How many calories is 1 joule?

1 joule equals 0.239005736138 calories.

How many joules is 1 calorie?

1 calorie equals 4.184 joules.

What is the difference between joules and calories?

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 joules and calories 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 joule equal 0.239005736138 calories?

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