Kilocalories (kcal) to Electronvolts (eV) Converter
Enter a value to instantly convert between energy units.
1 Kilocalorie = 2.6114e+22 Electronvolt
Key Formulas
Kilocalorie → Kilojoule
kJ = kcal × 4.184Kilojoule → Kilocalorie
kcal = kJ × 0.239006Kilowatt-Hour → Joule
J = kWh × 3600000Joule → Kilowatt-Hour
kWh = J × 2.77778e-7Formula
eV = kcal ÷ 3.8293e-23One kilocalorie equals about 2.611×10²² electronvolts. Since 1 kcal = 4184 J and 1 eV = 1.602×10⁻¹⁹ J, the conversion factor is 4184/1.602×10⁻¹⁹ = 2.611×10²² eV. This connects dietary energy to atomic physics.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A biochemist calculating the energy of ATP hydrolysis (about 1 kcal/mol) as 2.61×10²² eV.
1 kcal = 2.611e+22 eV
A researcher analyzing 1000 kcal of metabolic energy as 2.61×10²⁵ eV for the quantum model.
1000 kcal = 2.611e+25 eV
A physicist noting that 1 Cal (4.184 kJ) equals 1.092×10²³ eV for the paper.
4.184 kcal = 1.092e+23 eV
A student converting 100 kcal of bond energy to eV gets 2.61×10²⁴ eV for the homework.
100 kcal = 2.611e+24 eV