Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 MJ | 1000 J | |
| 0.01 MJ | 10000 J | |
| 0.1 MJ | 100000 J | |
| 1 MJ | 1e+06 J | |
| 5 MJ | 5e+06 J | |
| 10 MJ | 1e+07 J | |
| 50 MJ | 5e+07 J | |
| 100 MJ | 1e+08 J | |
| 1000 MJ | 1e+09 J |
Formula: Joule = Megajoule × 1e+06
Multiply any megajoule value by 1e+06 to get joule.
Reverse: Megajoule = Joule × 1.0000e-6
Common megajoule values — factor: 1 MJ = 1e+06 J
| Megajoule (MJ) | Joule (J) | Context |
|---|---|---|
| 0.001 MJ | 1,000 J | 1 kJ |
| 0.01 MJ | 1e+04 J | 10 kJ |
| 0.1 MJ | 1e+05 J | 100 kJ |
| 1 MJ | 1e+06 J | 1 MJ |
| 3.6 MJ | 3.6e+06 J | 1 kWh |
| 10 MJ | 1e+07 J | 10 kWh |
| 34 MJ | 3.4e+07 J | 1L petrol |
| 100 MJ | 1e+08 J | ~28 kWh |
| 360 MJ | 3.6e+08 J | 100 kWh |
| 1,000 MJ | 1.000e+09 J | ~278 kWh |
| 4,600 MJ | 4.600e+09 J | 1 tonne TNT |
| 1e+04 MJ | 1.000e+10 J | ~2.8 MWh |
| 1e+05 MJ | 1.000e+11 J | ~28 MWh |
| 1e+06 MJ | 1.000e+12 J | ~278 MWh |
| 1.000e+09 MJ | 1.000e+15 J | ~278 GWh |
1 MJ = 1e+06 J. Memorize for instant estimates.
Use 1e+06 as a quick mental multiplier.
Multiply result by 1.0000e-6 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 joule is the SI derived unit of energy, work, and heat, defined as the energy transferred when a force of one newton moves an object one meter. It was named after James Prescott Joule, the English physicist who established the mechanical equivalent of heat in the 1840s.
The joule is universal in physics and engineering: kinetic energy (½mv²), potential energy (mgh), electrical energy (VIt), and heat are all measured in joules. One joule is the energy needed to lift a 100g apple one meter against gravity.
Interesting fact: The human heart expends about 1 joule of energy with each beat. A 60-watt light bulb uses 60 joules every second. The entire energy released by a 1-megaton nuclear weapon equals about 4.18 × 10¹⁵ joules.
Converting megajoule to joule 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 = 5e+06 J and 10 MJ = 1e+07 J. Reverse: 1 J = 1.0000e-6 MJ. Exact factor: 1 MJ = 1e+06 J.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.