kcal to eV Converter

How to convert kilocalories to electronvolts

FormulaeV = kcal × 2.611447397×10²²

Multiply the value in kilocalories by 2.611447397×10²². To go the other way, multiply by 3.829294058×10⁻²³ (or divide by 2.611447397×10²²).

A kilocalorie is larger than an electronvolt: one kilocalorie contains 2.611447397×10²² electronvolts.

Worked examples

1 kilocalorie (food Calorie)1 kcal × 2.611447397×10²² = 2.611447397×10²² eV
5 kilocalories5 kcal × 2.611447397×10²² = 1.305723698×10²³ eV
10 kilocalories10 kcal × 2.611447397×10²² = 2.611447397×10²³ eV
20 kilocalories20 kcal × 2.611447397×10²² = 5.222894794×10²³ eV
100 kilocalories100 kcal × 2.611447397×10²² = 2.611447397×10²⁴ eV

Kilocalories to electronvolts conversion table

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

Kilocalories to electronvolts: 0.1–10 kcal
Kilocalories (kcal)	Electronvolts (eV)
0.1 kcal	2.6114474×10²¹ eV
0.25 kcal	6.5286185×10²¹ eV
0.5 kcal	1.3057237×10²² eV
1 kcal	2.6114474×10²² eV
2 kcal	5.2228948×10²² eV
3 kcal	7.8343422×10²² eV
4 kcal	1.044579×10²³ eV
5 kcal	1.3057237×10²³ eV
6 kcal	1.5668684×10²³ eV
7 kcal	1.8280132×10²³ eV
8 kcal	2.0891579×10²³ eV
9 kcal	2.3503027×10²³ eV
10 kcal	2.6114474×10²³ eV

Kilocalories to electronvolts: 12–1,000 kcal
Kilocalories (kcal)	Electronvolts (eV)
12 kcal	3.1337369×10²³ eV
15 kcal	3.9171711×10²³ eV
20 kcal	5.2228948×10²³ eV
25 kcal	6.5286185×10²³ eV
30 kcal	7.8343422×10²³ eV
40 kcal	1.044579×10²⁴ eV
50 kcal	1.3057237×10²⁴ eV
75 kcal	1.9585855×10²⁴ eV
100 kcal	2.6114474×10²⁴ eV
250 kcal	6.5286185×10²⁴ eV
500 kcal	1.3057237×10²⁵ eV
1,000 kcal	2.6114474×10²⁵ eV

About the units

Kilocalorie (kcal)

One thousand small calories, or 4,184 J. The “Calories” on nutrition labels are kilocalories.

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 kilocalorie?

There are 2.611447397×10²² electronvolts in one kilocalorie, and this value is exact by definition.

How do I convert kilocalories to electronvolts?

Multiply the number of kilocalories by 2.611447397×10²². For example, 10 kcal × 2.611447397×10²² = 2.611447397×10²³ eV.

How many kilocalories are in one electronvolt?

One electronvolt equals 3.829294058×10⁻²³ kilocalories. That is the reverse factor, 1 ÷ 2.611447397×10²².

What is 10 kilocalories in electronvolts?

10 kcal = 2.611447397×10²³ eV.

Is this kcal 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.