Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 kJ | 6.242e+18 eV | |
| 0.01 kJ | 6.242e+19 eV | |
| 0.1 kJ | 6.242e+20 eV | |
| 1 kJ | 6.242e+21 eV | |
| 5 kJ | 3.121e+22 eV | |
| 10 kJ | 6.242e+22 eV | |
| 50 kJ | 3.121e+23 eV | |
| 100 kJ | 6.242e+23 eV | |
| 1000 kJ | 6.242e+24 eV |
Formula: Electron Volt = Kilojoule × 6.2422e21
Multiply any kilojoule value by 6.2422e21 to get electron volt.
Reverse: Kilojoule = Electron Volt × 1.6020e-22
Common kilojoule values — factor: 1 kJ = 6.2422e21 eV
| Kilojoule (kJ) | Electron Volt (eV) | Context |
|---|---|---|
| 0.001 kJ | 6.242e+18 eV | 1 J |
| 0.01 kJ | 6.242e+19 eV | 10 J |
| 0.1 kJ | 6.242e+20 eV | 100 J |
| 1 kJ | 6.242e+21 eV | 1 kJ |
| 4.184 kJ | 2.612e+22 eV | 1 kcal |
| 10 kJ | 6.242e+22 eV | 10 kJ |
| 100 kJ | 6.242e+23 eV | 100 kJ |
| 1,000 kJ | 6.242e+24 eV | 1 MJ |
| 3,600 kJ | 2.247e+25 eV | 1 kWh |
| 1e+04 kJ | 6.242e+25 eV | 10 MJ |
| 1e+05 kJ | 6.242e+26 eV | 100 MJ |
| 1e+06 kJ | 6.242e+27 eV | 1 GJ |
| 1e+08 kJ | 6.242e+29 eV | 100 GJ |
| 1.000e+10 kJ | 6.242e+31 eV | 10 TJ |
| 1.000e+12 kJ | 6.242e+33 eV | 1 PJ |
1 kJ = 6.2422e21 eV. Memorize for instant estimates.
Use 6.2422e21 as a quick mental multiplier.
Multiply result by 1.6020e-22 to recover the original kJ value.
Labels food energy in kJ for metric-market nutritional information.
Calculates reaction heat, enthalpy changes, and process energy in kJ.
Measures athlete metabolic rate and substrate oxidation in kJ.
Teaches heat transfer, steam tables, and engine cycles using kJ.
Prescribes energy intake using kJ in countries using metric labels.
Calculates heat duty for reactors, heat exchangers, and distillation in kJ.
The kilojoule (kJ) equals 1,000 joules and is the practical energy unit for food, chemistry, and heating applications in metric countries. Food energy labels in Australia, Europe, and most of the world use kilojoules.
A dietary calorie (kcal) equals 4.184 kJ. A can of soda contains about 600 kJ. The specific heat of water (4.184 kJ/kg·°C) means heating 1 liter of water by 1°C requires 4.184 kJ.
Interesting fact: An average adult needs about 8,000-10,000 kJ (2,000-2,400 kcal) per day. Running a marathon burns approximately 12,500 kJ.
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 kilojoule 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 kJ = 3.1211e22 eV and 10 kJ = 6.2422e22 eV. Reverse: 1 eV = 1.6020e-22 kJ. Exact factor: 1 kJ = 6.2422e21 eV.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.