Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 MJ | 6.242e+21 eV | |
| 0.01 MJ | 6.242e+22 eV | |
| 0.1 MJ | 6.242e+23 eV | |
| 1 MJ | 6.242e+24 eV | |
| 5 MJ | 3.121e+25 eV | |
| 10 MJ | 6.242e+25 eV | |
| 50 MJ | 3.121e+26 eV | |
| 100 MJ | 6.242e+26 eV | |
| 1000 MJ | 6.242e+27 eV |
Formula: Electron Volt = Megajoule × 6.2422e24
Multiply any megajoule value by 6.2422e24 to get electron volt.
Reverse: Megajoule = Electron Volt × 1.6020e-25
Common megajoule values — factor: 1 MJ = 6.2422e24 eV
| Megajoule (MJ) | Electron Volt (eV) | Context |
|---|---|---|
| 0.001 MJ | 6.242e+21 eV | 1 kJ |
| 0.01 MJ | 6.242e+22 eV | 10 kJ |
| 0.1 MJ | 6.242e+23 eV | 100 kJ |
| 1 MJ | 6.242e+24 eV | 1 MJ |
| 3.6 MJ | 2.247e+25 eV | 1 kWh |
| 10 MJ | 6.242e+25 eV | 10 kWh |
| 34 MJ | 2.122e+26 eV | 1L petrol |
| 100 MJ | 6.242e+26 eV | ~28 kWh |
| 360 MJ | 2.247e+27 eV | 100 kWh |
| 1,000 MJ | 6.242e+27 eV | ~278 kWh |
| 4,600 MJ | 2.871e+28 eV | 1 tonne TNT |
| 1e+04 MJ | 6.242e+28 eV | ~2.8 MWh |
| 1e+05 MJ | 6.242e+29 eV | ~28 MWh |
| 1e+06 MJ | 6.242e+30 eV | ~278 MWh |
| 1.000e+09 MJ | 6.242e+33 eV | ~278 GWh |
1 MJ = 6.2422e24 eV. Memorize for instant estimates.
Use 6.2422e24 as a quick mental multiplier.
Multiply result by 1.6020e-25 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 electron volt (eV) is the energy gained by a single electron accelerating through a potential difference of one volt, equal to approximately 1.602 × 10⁻¹⁹ joules. It was formally adopted as a unit by the IEC in 1930.
Electron volts are the standard energy unit in atomic physics, particle physics, and semiconductor engineering. Chemical bond energies are a few eV; X-ray photons are kiloelectron volts (keV); particle accelerators measure GeV and TeV.
Interesting fact: The Large Hadron Collider accelerates protons to 6.8 TeV (6.8 × 10¹² eV). Visible light photons have energies of 1.8–3.1 eV. The rest mass energy of an electron is 511 keV.
Converting megajoule to electron volt 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 = 3.1211e25 eV and 10 MJ = 6.2422e25 eV. Reverse: 1 eV = 1.6020e-25 MJ. Exact factor: 1 MJ = 6.2422e24 eV.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.