Calories to Joules
Convert calories to joules.
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Example
100 cal = 418.4 J
How it works
A calorie is a unit of energy, and a joule is the SI unit of energy used in science. This conversion works because 1 calorie is defined as exactly 4.184 joules, so you multiply the calorie value by 4.184 to express the same amount of energy in joules. The formula keeps the energy amount the same while changing only the unit.
When to use it
Use this when converting food energy, heat energy, or physics quantities from calories into SI units. It is especially helpful in chemistry, biology, and physics problems where joules are preferred.
Worked example, step by step
Convert 250 cal to joules J = cal × 4.184 J = 250 × 4.184 J = 1046 So, 250 cal = 1046 J
Common mistakes to avoid
- multiplying by 0.239 instead of 4.184 when converting from calories to joules
- forgetting that the result should be in joules, not calories
- using this formula for kilocalories without first converting the units properly
Did You Know?
One food Calorie is actually a kilocalorie, a thousand of the tiny calories used in physics.
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