Calories to Joules Converter
Convert calories to joules instantly. Free calorie to joule converter for energy calculations.
Formula
J = cal × 4.184
Common Conversions
How to Convert Calories to Joules
1 calorie (cal) = 4.184 joules (J). Multiply calories by 4.184 to get joules. So 100 cal × 4.184 = 418.4 J. Note: this 'small calorie' (cal) is rare in everyday use; 'food calories' (kcal or Cal) are 1,000 small calories each, so 1 kcal = 4,184 J = 4.184 kJ.
Used in scientific energy calculations and precision nutrition labelling. The thermodynamics calorie (4.184 J) is the energy needed to raise 1 gram of water by 1 °C. Most everyday 'calorie' references are food calories (kcal), thousand times larger - a 250 kcal snack = 1,046 kJ.
Common Calories to Joules
| Calories (cal) | Joules (J) |
|---|---|
| 1 cal | 4.184 J |
| 10 cal | 41.84 J |
| 100 cal | 418.4 J |
| 500 cal | 2092 J |
| 1000 cal (1 kcal) | 4184 J |
| 2000 kcal (food) | 8368 kJ |
| 10000 kcal | 41840 kJ |
| 50000 kcal | 209200 kJ |
Frequently Asked Questions
Are food calories small or large calories?
Food 'calories' are large calories (kcal). When a label says '500 calories', it means 500 kcal = 500,000 small calories. The capital C in 'Calorie' (rarely seen) historically distinguished kcal from cal, but most modern usage just says 'calorie' for food despite meaning kcal.
Should I use joules or calories for nutrition?
EU nutrition labels show both kJ and kcal. UK uses both equally. US uses kcal only (called 'calories'). Australian and many Asian countries use kJ primarily. 1 kcal = 4.184 kJ for conversion.
Related Tools
Joules to Calories Converter
Convert joules to calories easily. Free joule to calorie converter for energy calculations.
Kwh to Btu Converter
Convert kilowatt hours to BTU instantly. Free kWh to BTU converter for energy conversion.
Calories to Kcal Converter
Convert calories to kilocalories instantly. Free calorie to kcal converter for nutrition.