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Formula
J = cal × 4.184
Example
Example: convert 100 calories to joules.
100 cal = 418.4 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
- Start with the value in calories (cal).
- Multiply it by 4.184.
- The result is the measurement in joules (J).
Example: 100 cal → 418.4 J
Frequently Asked Questions
How do you convert joules to calories?
Divide joules by 4.184 to get calories.
How many joules are in 1 kWh?
1 kilowatt-hour equals 3.6 million joules.
How do you convert calories to joules?
Multiply calories by 4.184 to get joules.
What energy units can I convert here?
This converter supports joules, kilojoules, watt-hours, kilowatt-hours, calories, kilocalories, BTU, electronvolts, and more.
What is a kilowatt-hour?
A kilowatt-hour is a unit of energy commonly used for electricity usage and billing.
How many calories are in 100 joules?
100 joules equal about 23.9 small calories.
Can I convert BTU and kWh here?
Yes. This converter supports both BTU and kilowatt-hours.
Is energy conversion useful for electricity and heating?
Yes. Energy conversion is useful for power usage, food energy, physics, and heating systems.
What’s the difference between a calorie and a Calorie?
A small calorie (cal) is used in physics. A food Calorie (Cal) is a kilocalorie: 1 Cal = 1 kcal = 4,184 J.
How many BTU are in 1 kWh?
1 kWh equals about 3,412.14 BTU (IT).