Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 MJ | 1 kJ | |
| 0.01 MJ | 10 kJ | |
| 0.1 MJ | 100 kJ | |
| 1 MJ | 1000 kJ | |
| 5 MJ | 5000 kJ | |
| 10 MJ | 10000 kJ | |
| 50 MJ | 50000 kJ | |
| 100 MJ | 100000 kJ | |
| 1000 MJ | 1e+06 kJ |
Formula: Kilojoule = Megajoule × 1000
Multiply any megajoule value by 1000 to get kilojoule.
Reverse: Megajoule = Kilojoule × 0.001
Common megajoule values — factor: 1 MJ = 1000 kJ
| Megajoule (MJ) | Kilojoule (kJ) | Context |
|---|---|---|
| 0.001 MJ | 1 kJ | 1 kJ |
| 0.01 MJ | 10 kJ | 10 kJ |
| 0.1 MJ | 100 kJ | 100 kJ |
| 1 MJ | 1,000 kJ | 1 MJ |
| 3.6 MJ | 3,600 kJ | 1 kWh |
| 10 MJ | 1e+04 kJ | 10 kWh |
| 34 MJ | 3.4e+04 kJ | 1L petrol |
| 100 MJ | 1e+05 kJ | ~28 kWh |
| 360 MJ | 3.6e+05 kJ | 100 kWh |
| 1,000 MJ | 1e+06 kJ | ~278 kWh |
| 4,600 MJ | 4.6e+06 kJ | 1 tonne TNT |
| 1e+04 MJ | 1e+07 kJ | ~2.8 MWh |
| 1e+05 MJ | 1e+08 kJ | ~28 MWh |
| 1e+06 MJ | 1.000e+09 kJ | ~278 MWh |
| 1.000e+09 MJ | 1.000e+12 kJ | ~278 GWh |
MJ × 1,000 = kJ. Exact.
Simple mega prefix.
kJ ÷ 1,000 = MJ.
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 kilojoule (kJ) equals 1,000 joules and is the practical energy unit for food, chemistry, and heating applications in metric countries. Food energy labels in Australia, Europe, and most of the world use kilojoules.
A dietary calorie (kcal) equals 4.184 kJ. A can of soda contains about 600 kJ. The specific heat of water (4.184 kJ/kg·°C) means heating 1 liter of water by 1°C requires 4.184 kJ.
Interesting fact: An average adult needs about 8,000-10,000 kJ (2,000-2,400 kcal) per day. Running a marathon burns approximately 12,500 kJ.
Converting megajoule to kilojoule 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 = 5000 kJ and 10 MJ = 10,000 kJ. Reverse: 1 kJ = 0.001 MJ. Exact factor: 1 MJ = 1000 kJ.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.