Converting energy from joules to electron volts (eV) is essential in fields like physics and engineering. One joule is equivalent to approximately 6.241509 × 10¹⁸ electron volts. To perform this conversion, multiply the energy value in joules by this factor. For instance, 2 joules equal 1.248302 × 10¹⁹ eV. Conversely, to convert from electron volts to joules, multiply the energy in eV by 1.602176634 × 10⁻¹⁹. This conversion is particularly useful when dealing with energy measurements at the atomic and subatomic scales, where electron volts provide a more convenient unit of measure.