Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 J | 6.242e+15 eV | |
| 0.01 J | 6.242e+16 eV | |
| 0.1 J | 6.242e+17 eV | |
| 1 J | 6.242e+18 eV | |
| 5 J | 3.121e+19 eV | |
| 10 J | 6.242e+19 eV | |
| 50 J | 3.121e+20 eV | |
| 100 J | 6.242e+20 eV | |
| 1000 J | 6.242e+21 eV |
Formula: Electron Volt = Joule × 6.2422e18
Multiply any joule value by 6.2422e18 to get electron volt.
Reverse: Joule = Electron Volt × 1.6020e-19
Common joule values — factor: 1 J = 6.2422e18 eV
| Joule (J) | Electron Volt (eV) | Context |
|---|---|---|
| 0.001 J | 6.242e+15 eV | 1 mJ |
| 0.1 J | 6.242e+17 eV | Heartbeat |
| 1 J | 6.242e+18 eV | Lift apple 10cm |
| 4.184 J | 2.612e+19 eV | 1 calorie |
| 100 J | 6.242e+20 eV | Sprinting 1 sec |
| 1,000 J | 6.242e+21 eV | 1 kJ |
| 4,184 J | 2.612e+22 eV | 1 kcal food |
| 1e+04 J | 6.242e+22 eV | 10 kJ |
| 1e+05 J | 6.242e+23 eV | 100 kJ |
| 1.055e+06 J | 6.586e+24 eV | 1 BTU |
| 3.6e+06 J | 2.247e+25 eV | 1 kWh |
| 1e+08 J | 6.242e+26 eV | ~100 MJ |
| 1.000e+09 J | 6.242e+27 eV | 1 GJ |
| 1.000e+12 J | 6.242e+30 eV | 1 TJ |
| 1.000e+15 J | 6.242e+33 eV | 1 PJ |
1 J = 6.2422e18 eV. Memorize for instant estimates.
Use 6.2422e18 as a quick mental multiplier.
Multiply result by 1.6020e-19 to recover the original J value.
Uses joules as the SI unit for all energy, work, and heat calculations.
Calculates kinetic energy, potential energy, and work in joules.
Measures reaction enthalpies, bond energies, and heat of solution in joules.
Converts between power (watts) and energy (joules = watt-seconds).
Measures fracture energy and impact resistance in joules.
Applies the first law of thermodynamics with energy in joules.
The joule is the SI derived unit of energy, work, and heat, defined as the energy transferred when a force of one newton moves an object one meter. It was named after James Prescott Joule, the English physicist who established the mechanical equivalent of heat in the 1840s.
The joule is universal in physics and engineering: kinetic energy (½mv²), potential energy (mgh), electrical energy (VIt), and heat are all measured in joules. One joule is the energy needed to lift a 100g apple one meter against gravity.
Interesting fact: The human heart expends about 1 joule of energy with each beat. A 60-watt light bulb uses 60 joules every second. The entire energy released by a 1-megaton nuclear weapon equals about 4.18 × 10¹⁵ joules.
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 joule 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 J = 3.1211e19 eV and 10 J = 6.2422e19 eV. Reverse: 1 eV = 1.6020e-19 J. Exact factor: 1 J = 6.2422e18 eV.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.