Calories (cal) to Electronvolts (eV) Converter
Enter a value to instantly convert between energy units.
1 Calorie (thermochemical) = 2.6114e+19 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 = cal ÷ 3.8293e-20One thermochemical calorie equals about 2.611×10¹⁹ electronvolts. Since 1 cal = 4.184 J and 1 eV = 1.602×10⁻¹⁹ J, the conversion factor is 4.184/1.602×10⁻¹⁹ = 2.611×10¹⁹ eV. This is used in quantum chemistry and molecular physics.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A chemist calculating the energy of a molecular bond in calories — 2.61×10¹⁹ eV.
1 cal = 26110000000000000000 eV
A physicist analyzing 1000 cal of reaction heat writes 2.61×10²² eV in the paper.
1000 cal = 2.611e+22 eV
A researcher noting that 1 kcal (4184 J) equals 1.092×10²⁰ eV for the quantum calculation.
4.184 cal = 109200000000000000000 eV
A student converting 10 cal of bond energy to eV gets 2.61×10²⁰ eV for the homework.
10 cal = 261100000000000000000 eV