Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 kJ | 2.778e-10 MWh | |
| 0.01 kJ | 2.77778e-09 MWh | |
| 0.1 kJ | 2.77778e-08 MWh | |
| 1 kJ | 2.77778e-07 MWh | |
| 5 kJ | 1.38889e-06 MWh | |
| 10 kJ | 2.77778e-06 MWh | |
| 50 kJ | 1.38889e-05 MWh | |
| 100 kJ | 2.77778e-05 MWh | |
| 1000 kJ | 0.000277778 MWh |
Formula: Megawatt-Hour = Kilojoule × 2.7778e-7
Multiply any kilojoule value by 2.7778e-7 to get megawatt-hour.
Reverse: Kilojoule = Megawatt-Hour × 3.6e+06
Common kilojoule values — factor: 1 kJ = 2.7778e-7 MWh
| Kilojoule (kJ) | Megawatt-Hour (MWh) | Context |
|---|---|---|
| 0.001 kJ | 2.778e-10 MWh | 1 J |
| 0.01 kJ | 2.778e-09 MWh | 10 J |
| 0.1 kJ | 2.778e-08 MWh | 100 J |
| 1 kJ | 2.778e-07 MWh | 1 kJ |
| 4.184 kJ | 1.162e-06 MWh | 1 kcal |
| 10 kJ | 2.778e-06 MWh | 10 kJ |
| 100 kJ | 2.778e-05 MWh | 100 kJ |
| 1,000 kJ | 0.0002778 MWh | 1 MJ |
| 3,600 kJ | 0.001 MWh | 1 kWh |
| 1e+04 kJ | 0.002778 MWh | 10 MJ |
| 1e+05 kJ | 0.02778 MWh | 100 MJ |
| 1e+06 kJ | 0.2778 MWh | 1 GJ |
| 1e+08 kJ | 27.78 MWh | 100 GJ |
| 1.000e+10 kJ | 2,778 MWh | 10 TJ |
| 1.000e+12 kJ | 2.778e+05 MWh | 1 PJ |
1 kJ = 2.7778e-7 MWh. Memorize for instant estimates.
Use 2.7778e-7 as a quick mental multiplier.
Multiply result by 3.6e+06 to recover the original kJ value.
Labels food energy in kJ for metric-market nutritional information.
Calculates reaction heat, enthalpy changes, and process energy in kJ.
Measures athlete metabolic rate and substrate oxidation in kJ.
Teaches heat transfer, steam tables, and engine cycles using kJ.
Prescribes energy intake using kJ in countries using metric labels.
Calculates heat duty for reactors, heat exchangers, and distillation in kJ.
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.
The megawatt-hour (MWh) equals 1,000 kWh or 3.6 × 10⁹ joules. It is the standard unit for utility-scale electricity generation, large industrial consumers, and grid-level energy storage.
Power plants, wind farms, and solar installations are rated and billed in MWh. A 2 MW wind turbine generates about 6 MWh per day on average. Large data centers consume thousands of MWh per month.
Interesting fact: The Hoover Dam generates about 4,000 MWh per hour. A single nuclear power plant produces about 8,000 MWh per hour. World electricity consumption is approximately 25,000 TWh (25 billion MWh) per year.
Converting kilojoule to megawatt-hour 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 kJ = 1.3889e-6 MWh and 10 kJ = 2.7778e-6 MWh. Reverse: 1 MWh = 3.6e+06 kJ. Exact factor: 1 kJ = 2.7778e-7 MWh.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.