Calorie to Joule Converter
Convert Calorie to Joule — free, instant, accurate. Part of Energy converters.
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Calorie to Joule: values and formula
1 Calorie = 4.184 Joule, and 1 Joule = 0.2390057361 Calorie. To convert a energy value from Calorie to Joule, multiply it by 4.184. For example, 10 Calorie equals 41.84 Joule, and 250 Calorie equals 1046 Joule.
| Calorie | Joule |
|---|---|
| 1 Calorie | 4.184 Joule |
| 2 Calorie | 8.368 Joule |
| 5 Calorie | 20.92 Joule |
| 10 Calorie | 41.84 Joule |
| 25 Calorie | 104.6 Joule |
| 50 Calorie | 209.2 Joule |
| 100 Calorie | 418.4 Joule |
| 500 Calorie | 2092 Joule |
| 1000 Calorie | 4184 Joule |
When to use the Calorie to Joule converter
- Nutrition — reading kilocalories vs kilojoules on food labels.
- Energy bills — comparing kilowatt-hours and joules.
- HVAC sizing — converting BTU/h to watts.
- Physics — switching between joules and electronvolts.
A short history of energy units
The joule, named after physicist James Prescott Joule, became the SI unit of energy in 1948. Before that, energy was tracked in calories (heat), foot-pounds (mechanical), BTU (steam engineering), and kilowatt-hours (electricity). Each survives in its original niche — calories on food packaging, BTU in HVAC ratings, kWh on power bills.
Common mistakes when converting energy
Calorie vs kilocalorie
Food "calories" are actually kilocalories. 1 food Cal = 1000 cal = 4184 J.
kWh is energy, not power
A kilowatt-hour is one kilowatt sustained for one hour. Power (kW) is the rate; energy (kWh) is the total.
Mixing BTU types
There are several "BTU" definitions (IT, thermochemical, mean) differing slightly; default to the IT BTU (1055.056 J) for HVAC.
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