Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 MJ | 0.239006 kcal | |
| 0.01 MJ | 2.39006 kcal | |
| 0.1 MJ | 23.9006 kcal | |
| 1 MJ | 239.006 kcal | |
| 5 MJ | 1195.03 kcal | |
| 10 MJ | 2390.06 kcal | |
| 50 MJ | 11950.3 kcal | |
| 100 MJ | 23900.6 kcal | |
| 1000 MJ | 239006 kcal |
Formula: Kilocalorie = Megajoule × 239
Multiply any megajoule value by 239 to get kilocalorie.
Reverse: Megajoule = Kilocalorie × 0.004184
Common megajoule values — factor: 1 MJ = 239 kcal
| Megajoule (MJ) | Kilocalorie (kcal) | Context |
|---|---|---|
| 0.001 MJ | 0.239 kcal | 1 kJ |
| 0.01 MJ | 2.39 kcal | 10 kJ |
| 0.1 MJ | 23.9 kcal | 100 kJ |
| 1 MJ | 239 kcal | 1 MJ |
| 3.6 MJ | 860.4 kcal | 1 kWh |
| 10 MJ | 2,390 kcal | 10 kWh |
| 34 MJ | 8,126 kcal | 1L petrol |
| 100 MJ | 2.39e+04 kcal | ~28 kWh |
| 360 MJ | 8.604e+04 kcal | 100 kWh |
| 1,000 MJ | 2.39e+05 kcal | ~278 kWh |
| 4,600 MJ | 1.099e+06 kcal | 1 tonne TNT |
| 1e+04 MJ | 2.39e+06 kcal | ~2.8 MWh |
| 1e+05 MJ | 2.39e+07 kcal | ~28 MWh |
| 1e+06 MJ | 2.39e+08 kcal | ~278 MWh |
| 1.000e+09 MJ | 2.390e+11 kcal | ~278 GWh |
1 MJ = 239 kcal. Memorize for instant estimates.
Use 239 as a quick mental multiplier.
Multiply result by 0.004184 to recover the original MJ value.
Measures fuel energy content — 1 liter of petrol ≈ 34 MJ.
Compares battery pack energy in MJ and kWh for range calculations.
Quantifies explosive yield — 1 kg TNT ≈ 4.6 MJ.
Calculates daily/annual energy yield of solar and wind in MJ.
Compares fuel energy costs across transport modes in MJ/km.
Models annual heating and cooling energy demand in MJ.
The megajoule (MJ) equals 1,000,000 joules and is used for large-scale energy measurements in engineering, transportation, and industrial processes.
One liter of petrol contains about 34 MJ of chemical energy. A bolt of lightning releases about 1-5 MJ. An adult's daily food intake is roughly 8-10 MJ. Electric vehicle batteries are typically rated at 40-100 MJ (11-28 kWh).
Interesting fact: The kinetic energy of a 1,000 kg car traveling at 100 km/h is about 0.385 MJ. TNT explosive releases about 4.6 MJ per kilogram when detonated.
The kilocalorie (kcal) equals 1,000 calories or 4,184 joules, and is the unit used on food labels worldwide (often written as 'Cal' with a capital C in the US). It was standardized by the International Table calorie in 1956.
Nutritionists, dietitians, and food scientists use kcal for daily energy intake recommendations. Most adults need 2,000–2,500 kcal/day. Exercise apps, fitness trackers, and dietary plans all operate on kcal.
Interesting fact: One gram of fat yields about 9 kcal, one gram of carbohydrate or protein yields about 4 kcal. A single sugar cube (4g) contains about 16 kcal.
Converting megajoule to kilocalorie is common across energy, nutrition, engineering, and science. Different sectors use different energy units — joules in physics, kcal in nutrition, kWh in electricity, and BTU in HVAC — making accurate conversion essential for cross-disciplinary work and international comparisons.
Quick reference: 5 MJ = 1195 kcal and 10 MJ = 2390 kcal. Reverse: 1 kcal = 0.004184 MJ. Exact factor: 1 MJ = 239 kcal.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.