Calorie to Joule
Instantly convert Calorie (cal) to Joule (J). Free online converter with accurate results.
cal
Joule (J)
J
J = cal × 4.18400
Quick Reference: Calorie to Joule
| cal | J |
|---|---|
| 10 | 41.84 |
| 25 | 104.6 |
| 50 | 209.2 |
| 100 | 418.4 |
| 250 | 1,046 |
| 500 | 2,092 |
How to Convert Calorie to Joule
Formula:
J = cal × 4.18400
Example:
100 cal = 418.4 J
- Enter the value in Calorie you want to convert
- The result is calculated automatically
- Copy your result in Joule or continue converting
About Calorie and Joule
Calories and joules both measure energy. One calorie equals exactly 4.184 joules. The calorie used in nutrition (kilocalorie or 'Calorie' with capital C) is actually 1,000 small calories.
Common Uses for This Conversion
Scientific energy calculations, understanding nutrition labels internationally (EU uses kJ), physics problems, and comparing energy content across systems.
💡Did You Know?
The 'calorie' on food labels is actually a kilocalorie (kcal). When a food shows '200 Calories,' it means 200 kcal or 200,000 small calories—enough to heat 200 kg of water by 1°C.
Frequently Asked Questions
To convert calories to joules, multiply by 4.184. One calorie equals exactly 4.184 joules. For food calories (kcal), multiply by 4,184. For example, 100 calories = 418.4 joules, and 100 kcal = 418,400 joules.
A lowercase calorie (cal) is a small calorie, equal to 4.184 joules. An uppercase Calorie (Cal) or kilocalorie (kcal) is 1,000 small calories. Food labels typically use kilocalories (kcal), often written as Calories in the US.
To convert kilowatt-hours (kWh) to joules, multiply by 3,600,000 (3.6 × 10⁶). One kWh = 3.6 megajoules. For example, 1 kWh of electricity equals 3,600,000 joules of energy.
A BTU (British Thermal Unit) is the energy needed to raise 1 pound of water by 1°F. One BTU equals approximately 1,055.06 joules. BTUs are commonly used for heating/cooling systems in the US, while most of the world uses joules or kilojoules.
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