Joules (J) to Electronvolts (eV) Conversion
Joules
The joule (J) is the SI derived unit of energy, work, and heat, defined as the work done when a force of one newton displaces an object by one metre (J = N·m = kg·m²·s⁻²). Named after James Prescott Joule, who established the mechanical equivalent of heat in the 1840s, the joule unifies all forms of energy — mechanical, thermal, electrical, chemical, and nuclear — under one framework. One joule is small: lifting an apple (≈100 g) one metre requires about 1 joule, while a human at rest metabolises approximately 80 joules per second.
Electronvolts
The electronvolt (eV) is a unit of energy equal to exactly 1.602176634 × 10⁻¹⁹ joules, defined as the kinetic energy gained by a single electron accelerated through a potential difference of one volt. It is the standard unit in particle physics, atomic physics, and solid-state physics. Visible light photons carry 1.8–3.1 eV of energy; X-ray photons carry 100 eV to 100 keV; the proton beams at CERN's LHC reach 6.5 teraelectronvolts (TeV).
| Joules (J) | Electronvolts (eV) |
|---|---|
| 0.1 J | 624,150,907,446,076,300.00 eV |
| 1 J | 6,241,509,074,460,763,000.00 eV |
| 2 J | 12,483,018,148,921,526,000.00 eV |
| 3 J | 18,724,527,223,382,290,000.00 eV |
| 5 J | 31,207,545,372,303,815,000.00 eV |
| 10 J | 62,415,090,744,607,630,000.00 eV |
| 20 J | 124,830,181,489,215,260,000.00 eV |
| 30 J | 187,245,272,233,822,880,000.00 eV |
| 50 J | 312,075,453,723,038,200,000.00 eV |
| 100 J | 624,150,907,446,076,400,000.00 eV |
| 1000 J | 6,241,509,074,460,763,000,000.00 eV |
Frequently Asked Questions (FAQ)
How many electronvolts are in 1 joules?
1 joules (J) is exactly 6,241,509,074,460,763,136 electronvolts (eV).
How do I convert joules to electronvolts?
Multiply the value in joules by 6,241,509,074,460,763,136 to get the result in electronvolts. Or use the converter above — type any number and see the result instantly.