Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 MJ | 1e+10 erg | |
| 0.01 MJ | 1e+11 erg | |
| 0.1 MJ | 1e+12 erg | |
| 1 MJ | 1e+13 erg | |
| 5 MJ | 5e+13 erg | |
| 10 MJ | 1e+14 erg | |
| 50 MJ | 5e+14 erg | |
| 100 MJ | 1e+15 erg | |
| 1000 MJ | 1.000e+16 erg |
Formula: Erg = Megajoule × 1.0000e13
Multiply any megajoule value by 1.0000e13 to get erg.
Reverse: Megajoule = Erg × 1.0000e-13
Common megajoule values — factor: 1 MJ = 1.0000e13 erg
| Megajoule (MJ) | Erg (erg) | Context |
|---|---|---|
| 0.001 MJ | 1.000e+10 erg | 1 kJ |
| 0.01 MJ | 1.000e+11 erg | 10 kJ |
| 0.1 MJ | 1.000e+12 erg | 100 kJ |
| 1 MJ | 1.000e+13 erg | 1 MJ |
| 3.6 MJ | 3.600e+13 erg | 1 kWh |
| 10 MJ | 1.000e+14 erg | 10 kWh |
| 34 MJ | 3.400e+14 erg | 1L petrol |
| 100 MJ | 1.000e+15 erg | ~28 kWh |
| 360 MJ | 3.600e+15 erg | 100 kWh |
| 1,000 MJ | 1.000e+16 erg | ~278 kWh |
| 4,600 MJ | 4.600e+16 erg | 1 tonne TNT |
| 1e+04 MJ | 1.000e+17 erg | ~2.8 MWh |
| 1e+05 MJ | 1.000e+18 erg | ~28 MWh |
| 1e+06 MJ | 1.000e+19 erg | ~278 MWh |
| 1.000e+09 MJ | 1.000e+22 erg | ~278 GWh |
1 MJ = 1.0000e13 erg. Memorize for instant estimates.
Use 1.0000e13 as a quick mental multiplier.
Multiply result by 1.0000e-13 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 erg is the unit of energy in the CGS (centimeter-gram-second) system, equal to exactly 10⁻⁷ joules. It was defined by the British Association for the Advancement of Science in 1882 as the work done by a force of one dyne over one centimeter.
Ergs were widely used in 19th and early 20th century physics before SI standardization. They remain in use in astrophysics (stellar luminosities in erg/s) and some older scientific literature.
Interesting fact: The Sun radiates about 3.8 × 10³³ ergs per second. A mosquito in flight exerts about 100 ergs of energy per wingbeat. One joule = 10,000,000 ergs exactly.
Converting megajoule to erg 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 = 5.0000e13 erg and 10 MJ = 1.0000e14 erg. Reverse: 1 erg = 1.0000e-13 MJ. Exact factor: 1 MJ = 1.0000e13 erg.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.