Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 eV | 3.829e-26 kcal | |
| 0.01 eV | 3.829e-25 kcal | |
| 0.1 eV | 3.829e-24 kcal | |
| 1 eV | 3.829e-23 kcal | |
| 5 eV | 1.914e-22 kcal | |
| 10 eV | 3.829e-22 kcal | |
| 50 eV | 1.914e-21 kcal | |
| 100 eV | 3.829e-21 kcal | |
| 1000 eV | 3.829e-20 kcal |
Formula: Kilocalorie = Electron Volt × 3.8289e-23
Multiply any electron volt value by 3.8289e-23 to get kilocalorie.
Reverse: Electron Volt = Kilocalorie × 2.6117e22
Common electron volt values — factor: 1 eV = 3.8289e-23 kcal
| Electron Volt (eV) | Kilocalorie (kcal) | Context |
|---|---|---|
| 1 eV | 3.829e-23 kcal | Chemical bond |
| 100 eV | 3.829e-21 kcal | UV photon |
| 1e+04 eV | 3.829e-19 kcal | X-ray photon |
| 1e+06 eV | 3.829e-17 kcal | Gamma ray |
| 1.000e+09 eV | 3.829e-14 kcal | 1 GeV |
| 1.000e+12 eV | 3.829e-11 kcal | 1 TeV |
| 1.000e+15 eV | 3.829e-08 kcal | LHC range |
| 1.000e+18 eV | 3.829e-05 kcal | Ultra-high cosmic ray |
| 1.000e+21 eV | 0.03829 kcal | Macro scale |
| 1.000e+24 eV | 38.29 kcal | Millijoule scale |
| 1.000e+27 eV | 3.829e+04 kcal | Joule scale |
| 1.000e+30 eV | 3.829e+07 kcal | kJ scale |
| 1.000e+33 eV | 3.829e+10 kcal | MJ scale |
| 1.000e+36 eV | 3.829e+13 kcal | GJ scale |
| 1.000e+40 eV | 3.829e+17 kcal | Extreme |
1 eV = 3.8289e-23 kcal. Memorize for instant estimates.
Use 3.8289e-23 as a quick mental multiplier.
Multiply result by 2.6117e22 to recover the original eV value.
Works with beam energies, collision products, and mass-energy in eV.
Designs band gap structures — silicon band gap is 1.12 eV.
Selects tube voltage in keV for optimal diagnostic X-ray imaging.
Optimizes solar cell efficiency based on photon energy in eV.
Calculates nuclear binding energies and decay Q-values in MeV.
Measures work function and ionization energy in electron volts.
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.
The kilocalorie (kcal) equals 1,000 calories or 4,184 joules, and is the unit used on food labels worldwide (often written as 'Cal' with a capital C in the US). It was standardized by the International Table calorie in 1956.
Nutritionists, dietitians, and food scientists use kcal for daily energy intake recommendations. Most adults need 2,000–2,500 kcal/day. Exercise apps, fitness trackers, and dietary plans all operate on kcal.
Interesting fact: One gram of fat yields about 9 kcal, one gram of carbohydrate or protein yields about 4 kcal. A single sugar cube (4g) contains about 16 kcal.
Converting electron volt to kilocalorie 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 eV = 1.9144e-22 kcal and 10 eV = 3.8289e-22 kcal. Reverse: 1 kcal = 2.6117e22 eV. Exact factor: 1 eV = 3.8289e-23 kcal.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.