Calories to eV Converter (cal to eV)

How to convert calories to electronvolts

FormulaeV = cal × 2.611447397×10¹⁹

Multiply the value in calories by 2.611447397×10¹⁹. To go the other way, multiply by 3.829294058×10⁻²⁰ (or divide by 2.611447397×10¹⁹).

A calorie is larger than an electronvolt: one calorie contains 2.611447397×10¹⁹ electronvolts.

Worked examples

1 calorie (thermochemical)1 cal × 2.611447397×10¹⁹ = 2.611447397×10¹⁹ eV
5 calories5 cal × 2.611447397×10¹⁹ = 1.305723698×10²⁰ eV
10 calories10 cal × 2.611447397×10¹⁹ = 2.611447397×10²⁰ eV
20 calories20 cal × 2.611447397×10¹⁹ = 5.222894794×10²⁰ eV
100 calories100 cal × 2.611447397×10¹⁹ = 2.611447397×10²¹ eV

Calories to electronvolts conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Calories to electronvolts: 0.1–10 cal
Calories (cal)	Electronvolts (eV)
0.1 cal	2.6114474×10¹⁸ eV
0.25 cal	6.5286185×10¹⁸ eV
0.5 cal	1.3057237×10¹⁹ eV
1 cal	2.6114474×10¹⁹ eV
2 cal	5.2228948×10¹⁹ eV
3 cal	7.8343422×10¹⁹ eV
4 cal	1.044579×10²⁰ eV
5 cal	1.3057237×10²⁰ eV
6 cal	1.5668684×10²⁰ eV
7 cal	1.8280132×10²⁰ eV
8 cal	2.0891579×10²⁰ eV
9 cal	2.3503027×10²⁰ eV
10 cal	2.6114474×10²⁰ eV

Calories to electronvolts: 12–1,000 cal
Calories (cal)	Electronvolts (eV)
12 cal	3.1337369×10²⁰ eV
15 cal	3.9171711×10²⁰ eV
20 cal	5.2228948×10²⁰ eV
25 cal	6.5286185×10²⁰ eV
30 cal	7.8343422×10²⁰ eV
40 cal	1.044579×10²¹ eV
50 cal	1.3057237×10²¹ eV
75 cal	1.9585855×10²¹ eV
100 cal	2.6114474×10²¹ eV
250 cal	6.5286185×10²¹ eV
500 cal	1.3057237×10²² eV
1,000 cal	2.6114474×10²² eV

About the units

Calorie (cal)

The “small” calorie: exactly 4.184 J (thermochemical definition), roughly the energy to heat one gram of water by 1 °C.

Electronvolt (eV)

The energy an electron gains across one volt: exactly 1.602176634 × 10⁻¹⁹ J. One electronvolt equals 1.602176634×10⁻¹⁹ joules (J).

Frequently asked questions

How many electronvolts are in one calorie?

There are 2.611447397×10¹⁹ electronvolts in one calorie, and this value is exact by definition.

How do I convert calories to electronvolts?

Multiply the number of calories by 2.611447397×10¹⁹. For example, 10 cal × 2.611447397×10¹⁹ = 2.611447397×10²⁰ eV.

How many calories are in one electronvolt?

One electronvolt equals 3.829294058×10⁻²⁰ calories. That is the reverse factor, 1 ÷ 2.611447397×10¹⁹.

What is 10 calories in electronvolts?

10 cal = 2.611447397×10²⁰ eV.

Is this cal to eV converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.

Calories to eV Converter