Convert Megajoules to Electronvolts
1 megajoule (MJ) equals 6.241509074 × 10²⁴ electronvolts (eV).
1 MJ = 6.241509074e24 eV
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk megajoule to electronvolt converter to paste a column from Excel.
How to Convert Megajoule to Electronvolt
- 1 MJ = 6.241509074 × 10²⁴ eV
- 1 eV = 1.602176634 × 10⁻²⁵ MJ
- Example: convert 15 MJ to eV: 15 MJ = 15 × 6.241509074 × 10²⁴ eV = 9.362263612 × 10²⁵ eV
Formula
eV = MJ × 6.241509074461 × 10²⁴
Derivation from SI units:
- 1 MJ = 10⁶ J
- 1 eV = e × 1 V = 1.602176634 × 10⁻¹⁹ J (exact since 2019)
- 1 MJ = 1000000 J ÷ 1.602176634 × 10⁻¹⁹ J per eV = 6.241509074461 × 10²⁴ eV
Both units are defined exactly, so the factor is exact. Megajoule definition: megajoule; Electronvolt definition: electronvolt.
Worked examples
- A reading of 35 MJ converts to 2.184528176 × 10²⁶ eV.
35 MJ × 6.241509074 × 10²⁴ = 2.184528176 × 10²⁶ eV - A value of 50 MJ is 3.120754537 × 10²⁶ eV.
50 MJ × 6.241509074 × 10²⁴ = 3.120754537 × 10²⁶ eV
Megajoule to Electronvolt conversion table
| Megajoules (MJ) | Electronvolts (eV) |
|---|---|
| 1 MJ | 6.241509074 × 10²⁴ eV |
| 3.6 MJ | 2.246943267 × 10²⁵ eV |
| 10 MJ | 6.241509074 × 10²⁵ eV |
| 35 MJ | 2.184528176 × 10²⁶ eV |
| 38 MJ | 2.371773448 × 10²⁶ eV |
| 45 MJ | 2.808679084 × 10²⁶ eV |
| 50 MJ | 3.120754537 × 10²⁶ eV |
| 100 MJ | 6.241509074 × 10²⁶ eV |
| 1000 MJ | 6.241509074 × 10²⁷ eV |
Where it's used
Megajoules are used for fuel heating values (natural gas ≈ 38 MJ/m³, diesel ≈ 45 MJ/kg), while electronvolts appear in atomic and particle physics. Both measure energy, work and heat, so the conversion is a fixed factor.
Megajoule to other energy units
| Conversion | 1 MJ equals |
|---|---|
| megajoule to joule | 1000000 J |
| megajoule to kilojoule | 1000 kJ |
| megajoule to calorie | 239005.7361 cal |
| megajoule to kilocalorie | 239.0057361 kcal |
| megajoule to watt-hour | 277.7777778 Wh |
| megajoule to kilowatt-hour | 0.2777777778 kWh |
| megajoule to BTU | 947.8171203 BTU |
| megajoule to therm | 0.00948043428 thm |
| megajoule to electronvolt | 6.241509074 × 10²⁴ eV |
| megajoule to foot-pound | 737562.1493 ft·lbf |
| megajoule to erg | 10000000000000 erg |
Frequently asked questions
How many electronvolts are in 1 megajoule?
1 MJ = 6.241509074 × 10²⁴ eV.
How do I convert megajoules to electronvolts?
Multiply the value in MJ by 6.241509074 × 10²⁴. For example, 15 MJ × 6.241509074 × 10²⁴ = 9.362263612 × 10²⁵ eV.
Is the MJ to eV conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 and the fixed elementary charge e.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Megajoules to Electronvolts. Retrieved October 17, 2026, from https://scientificconverters.com/energy/megajoules-to-electronvolts/
IEEE
Scientific Converters, "Convert Megajoules to Electronvolts," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/megajoules-to-electronvolts/