Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 kWh | 0.0036 MJ | |
| 0.01 kWh | 0.036 MJ | |
| 0.1 kWh | 0.36 MJ | |
| 1 kWh | 3.6 MJ | |
| 5 kWh | 18 MJ | |
| 10 kWh | 36 MJ | |
| 50 kWh | 180 MJ | |
| 100 kWh | 360 MJ | |
| 1000 kWh | 3600 MJ |
Formula: Megajoule = Kilowatt-Hour × 3.6
Multiply any kilowatt-hour value by 3.6 to get megajoule.
Reverse: Kilowatt-Hour = Megajoule × 0.2778
Common kilowatt-hour values — factor: 1 kWh = 3.6 MJ
| Kilowatt-Hour (kWh) | Megajoule (MJ) | Context |
|---|---|---|
| 0.001 kWh | 0.0036 MJ | 1 Wh |
| 0.01 kWh | 0.036 MJ | 10 Wh |
| 0.1 kWh | 0.36 MJ | Phone charge |
| 0.5 kWh | 1.8 MJ | Half kWh |
| 1 kWh | 3.6 MJ | 1 kWh |
| 5 kWh | 18 MJ | 5 kWh |
| 10 kWh | 36 MJ | Washing machine |
| 30 kWh | 108 MJ | Daily home use |
| 100 kWh | 360 MJ | Monthly fraction |
| 500 kWh | 1,800 MJ | EV range |
| 1,000 kWh | 3,600 MJ | Monthly home |
| 1e+04 kWh | 3.6e+04 MJ | Annual home |
| 1e+05 kWh | 3.6e+05 MJ | Large commercial |
| 1e+06 kWh | 3.6e+06 MJ | Small factory |
| 1.000e+09 kWh | 3.600e+09 MJ | Power plant day |
kWh × 3.6 = MJ. Exact: 1 kWh = 3.6 MJ.
Memorize this — the most useful kWh anchor.
MJ ÷ 3.6 = kWh.
Reads monthly bills and compares appliance energy use in kWh.
Sizes solar systems based on kWh consumption and production estimates.
Tracks charging cost and range efficiency in kWh per 100 km.
Measures building energy consumption and identifies savings in kWh.
Plans grid capacity, demand response, and billing in kWh and MWh.
Monitors real-time appliance consumption in kWh via smart meters.
The kilowatt-hour (kWh) is the commercial unit of electrical energy, equal to the energy consumed by a 1,000-watt appliance in one hour (3,600,000 joules). It became standard with the growth of the electrical grid in the late 19th century.
Electricity bills worldwide are denominated in kWh. A typical household uses 300–1,000 kWh per month. An electric car uses about 15–25 kWh per 100 km. Solar panels generate 250–400 kWh per year per panel.
Interesting fact: The average price of electricity in the US is about $0.12 per kWh. One kWh can run a 100W light bulb for 10 hours, charge a smartphone about 100 times, or power a laptop for 2-3 days.
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.
Converting kilowatt-hour to megajoule 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 kWh = 18 MJ and 10 kWh = 36 MJ. Reverse: 1 MJ = 0.2778 kWh. Exact factor: 1 kWh = 3.6 MJ.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.