Joules to Calories
1 joule = 0.239006 calories (cal)
Convert joules to calories instantly. 1 joule = 0.239006 calories. Free, accurate, with conversion table and formula.
Joule (J)
Calorie (cal)
| Unit | 1 J equals |
|---|---|
| Joule (J) | 1 |
| Kilojoule (kJ) | 0.001 |
| Calorie (cal) | 0.239006 |
| Kilocalorie (kcal) | 0.000239006 |
| Watt Hour (Wh) | 0.000277778 |
| Kilowatt Hour (kWh) | 2.77778e-7 |
| BTU (BTU) | 0.000947813 |
| Electron Volt (eV) | 6.24151e+18 |
| Foot-Pound (ft·lb) | 0.737561 |
How to convert joules to calories
- 1Take your value in joules (J).
- 2Multiply by 0.239006.
- 3The result is your value in calories (cal).
Joules to Calories conversion table
| Joules (J) | Calories (cal) |
|---|---|
| 1 | 0.239006 |
| 2 | 0.478011 |
| 5 | 1.19503 |
| 10 | 2.39006 |
| 25 | 5.97514 |
| 50 | 11.9503 |
| 100 | 23.9006 |
| 250 | 59.7514 |
| 500 | 119.503 |
| 1,000 | 239.006 |
Frequently asked
How many calories are in a joule?
1 joule equals 0.239006 calories (cal).
How do I convert joules to calories?
Multiply the number of joules by 0.239006 to get calories.
What is 10 joules in calories?
10 J equals 2.39 cal.
What is 100 joules in calories?
100 J equals 23.9 cal.
How do I convert calories back to joules?
Multiply calories by 4.184 (the reciprocal) or use the swap button above.
Where you'll actually use this
Energy converters bridge joules, calories, kilowatt-hours, BTUs, and electron-volts — the same physical quantity expressed for science, nutrition, electricity, or HVAC.
- Electricity bills
Usage is billed in kWh. Convert to joules for physics, or to BTU for HVAC comparisons.
- Nutrition
Food 'calories' are actually kilocalories (kcal). 1 kcal = 4,184 J. EU labels list both kcal and kJ.
- HVAC & cooling
Air conditioner output is quoted in BTU/h in the US, watts elsewhere.
Common mistakes to avoid
- Calories vs kilocalories
When a food label says '250 calories' it really means 250 kcal = 250,000 small calories.
- kW vs kWh
kW is power (rate); kWh is energy (total). A 1 kW heater running for 2 hours uses 2 kWh.
Did you know?
A typical modern fridge uses about 1 kWh per 24 hours — roughly $0.10–$0.30 depending on local rates.
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