eV to kcal Converter

How to convert electronvolts to kilocalories

Formulakcal = eV × 3.829294058×10⁻²³

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

An electronvolt is smaller than a kilocalorie: it takes 2.611447397×10²² electronvolts to make one kilocalorie.

Worked examples

1 electronvolt1 eV × 3.829294058×10⁻²³ = 3.829294058×10⁻²³ kcal
5 electronvolts5 eV × 3.829294058×10⁻²³ = 1.914647029×10⁻²² kcal
10 electronvolts10 eV × 3.829294058×10⁻²³ = 3.829294058×10⁻²² kcal
20 electronvolts20 eV × 3.829294058×10⁻²³ = 7.658588117×10⁻²² kcal
100 electronvolts100 eV × 3.829294058×10⁻²³ = 3.829294058×10⁻²¹ kcal

Electronvolts to kilocalories conversion table

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

Electronvolts to kilocalories: 0.1–10 eV
Electronvolts (eV)	Kilocalories (kcal)
0.1 eV	3.8292941×10⁻²⁴ kcal
0.25 eV	9.5732351×10⁻²⁴ kcal
0.5 eV	1.914647×10⁻²³ kcal
1 eV	3.8292941×10⁻²³ kcal
2 eV	7.6585881×10⁻²³ kcal
3 eV	1.1487882×10⁻²² kcal
4 eV	1.5317176×10⁻²² kcal
5 eV	1.914647×10⁻²² kcal
6 eV	2.2975764×10⁻²² kcal
7 eV	2.6805058×10⁻²² kcal
8 eV	3.0634352×10⁻²² kcal
9 eV	3.4463647×10⁻²² kcal
10 eV	3.8292941×10⁻²² kcal

Electronvolts to kilocalories: 12–1,000 eV
Electronvolts (eV)	Kilocalories (kcal)
12 eV	4.5951529×10⁻²² kcal
15 eV	5.7439411×10⁻²² kcal
20 eV	7.6585881×10⁻²² kcal
25 eV	9.5732351×10⁻²² kcal
30 eV	1.1487882×10⁻²¹ kcal
40 eV	1.5317176×10⁻²¹ kcal
50 eV	1.914647×10⁻²¹ kcal
75 eV	2.8719705×10⁻²¹ kcal
100 eV	3.8292941×10⁻²¹ kcal
250 eV	9.5732351×10⁻²¹ kcal
500 eV	1.914647×10⁻²⁰ kcal
1,000 eV	3.8292941×10⁻²⁰ kcal

About the units

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).

Kilocalorie (kcal)

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

Frequently asked questions

How many kilocalories are in one electronvolt?

There are 3.829294058×10⁻²³ kilocalories in one electronvolt, and this value is exact by definition.

How do I convert electronvolts to kilocalories?

Multiply the number of electronvolts by 3.829294058×10⁻²³. For example, 10 eV × 3.829294058×10⁻²³ = 3.829294058×10⁻²² kcal.

How many electronvolts are in one kilocalorie?

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

What is 10 electronvolts in kilocalories?

10 eV = 3.829294058×10⁻²² kcal.

Is this eV to kcal 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.