Kilocalories to Joules
1 kilocalorie = 4184 joules (J)
Convert kilocalories to joules instantly. 1 kilocalorie = 4184 joules. Free, accurate, with conversion table and formula.
Kilocalorie (kcal)
Joule (J)
| Unit | 1 kcal equals |
|---|---|
| Joule (J) | 4,184 |
| Kilojoule (kJ) | 4.184 |
| Calorie (cal) | 1,000 |
| Kilocalorie (kcal) | 1 |
| Watt Hour (Wh) | 1.16222 |
| Kilowatt Hour (kWh) | 0.00116222 |
| BTU (BTU) | 3.96565 |
| Electron Volt (eV) | 2.61145e+22 |
| Foot-Pound (ft·lb) | 3,085.96 |
How to convert kilocalories to joules
- 1Take your value in kilocalories (kcal).
- 2Multiply by 4184.
- 3The result is your value in joules (J).
Kilocalories to Joules conversion table
| Kilocalories (kcal) | Joules (J) |
|---|---|
| 1 | 4,184 |
| 2 | 8,368 |
| 5 | 20,920 |
| 10 | 41,840 |
| 25 | 104,600 |
| 50 | 209,200 |
| 100 | 418,400 |
| 250 | 1.04600e+6 |
| 500 | 2.09200e+6 |
| 1,000 | 4.18400e+6 |
Frequently asked
How many joules are in a kilocalorie?
1 kilocalorie equals 4184 joules (J).
How do I convert kilocalories to joules?
Multiply the number of kilocalories by 4184 to get joules.
What is 10 kilocalories in joules?
10 kcal equals 4.184e+4 J.
What is 100 kilocalories in joules?
100 kcal equals 4.184e+5 J.
How do I convert joules back to kilocalories?
Multiply joules by 0.000239006 (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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