An electronvolt is the energy gained by an electron across one volt.
Electronvolts to Megajoules Converter — eV to MJ
Convert Electronvolt (eV) to Megajoule (MJ) using the exact conversion factor (1 electronvolt = 1.602177e-25 megajoule). See the formula, worked examples, conversion table, and common uses.
Electronvolts to Megajoules converter
Converter
Energy Converter
Convert joules, calories, kilowatt-hours, BTU, electronvolts, therms, and mechanical work units.
Context values
Some unit families need one extra value for a physically accurate result.
Megajoule is 1000000 joule units.
Result = input x 1.60217663e-19 / 1e+6.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Electronvolts to Megajoules
Electronvolt and Megajoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Electronvolt is most often used for particle physics (particle accelerator energies are often quoted in gev or tev).
Formula
megajoules = electronvolts × 1.602177e-25
This factor comes from each unit's defined relationship to the category's base unit: 1 electronvolt equals 1.602177e-19 base units, and 1 megajoule equals 1000000 base units, so dividing one by the other gives the direct electronvolt-to-megajoule factor of 1.602177e-25.
Simple example
1 eV × 1.602177e-25 = 1.602177e-25 MJ
1 electronvolt = 1.602177e-25 megajoules.
Real-world example
100 eV × 1.602177e-25 = 1.602177e-23 MJ
100 electronvolts = 1.602177e-23 megajoules.
Conversion table
| Electronvolt (eV) | Megajoule (MJ) |
|---|---|
| 1 eV | 1.602177e-25 MJ |
| 10 eV | 1.602177e-24 MJ |
| 100 eV | 1.602177e-23 MJ |
| 500 eV | 8.010883e-23 MJ |
| 1,000 eV | 1.602177e-22 MJ |
| 2,000 eV | 3.204353e-22 MJ |
Reverse conversion: Megajoule to Electronvolt
1.602177e-25 MJ × 6.241509e+24 = 1.000000228 eV
1.602177e-25 megajoules = 1.000000228 electronvolts.
electronvolts = megajoules × 6.241509e+24
For a page dedicated to this direction, see Megajoule to Electronvolt.
Understanding the Electronvolt
Electronvolt (eV) measures energy. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. It is classified as a non-SI unit accepted for use with the SI, common in physics.
Where it's used: Standard unit throughout particle physics, atomic physics, and chemistry worldwide
Uses of the Electronvolt today
- Particle physics (particle accelerator energies are often quoted in GeV or TeV)
- Atomic and molecular energy levels
- Semiconductor band-gap energies
Understanding the Megajoule (MJ)
Megajoule is 1000000 joule units.
Electronvolt — sources
- BIPM SI Brochure, 9th edition — Electronvolt listed as a non-SI unit accepted for use with the SI, with its exact value fixed via the elementary charge.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many megajoules are in 1 electronvolt?
1 electronvolt equals 1.602177e-25 megajoules, using the exact defined conversion factor rather than an estimate.
How do I convert electronvolt to megajoule?
Multiply the electronvolt value by 1.602177e-25. The converter above does this instantly to whatever precision you set.
How do I convert megajoule back to electronvolt?
Use the reverse factor: 1 megajoule equals 6.241509e+24 electronvolts. You can also use the swap control in the converter above to flip the direction instantly.
What is a electronvolt?
Electronvolt (eV) measures energy. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. It is classified as a non-SI unit accepted for use with the SI, common in physics.
What is a megajoule?
Megajoule (MJ) is a unit of energy.
Is the electronvolt to megajoule conversion exact?
Yes. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the electronvolt still used today?
Standard unit throughout particle physics, atomic physics, and chemistry worldwide