eV to Calories Converter (eV to cal)

How to convert electronvolts to calories

Formulacal = eV × 3.829294058×10⁻²⁰

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

An electronvolt is smaller than a calorie: it takes 2.611447397×10¹⁹ electronvolts to make one calorie.

Worked examples

1 electronvolt1 eV × 3.829294058×10⁻²⁰ = 3.829294058×10⁻²⁰ cal
5 electronvolts5 eV × 3.829294058×10⁻²⁰ = 1.914647029×10⁻¹⁹ cal
10 electronvolts10 eV × 3.829294058×10⁻²⁰ = 3.829294058×10⁻¹⁹ cal
20 electronvolts20 eV × 3.829294058×10⁻²⁰ = 7.658588117×10⁻¹⁹ cal
100 electronvolts100 eV × 3.829294058×10⁻²⁰ = 3.829294058×10⁻¹⁸ cal

Electronvolts to calories conversion table

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

Electronvolts to calories: 0.1–10 eV
Electronvolts (eV)	Calories (cal)
0.1 eV	3.8292941×10⁻²¹ cal
0.25 eV	9.5732351×10⁻²¹ cal
0.5 eV	1.914647×10⁻²⁰ cal
1 eV	3.8292941×10⁻²⁰ cal
2 eV	7.6585881×10⁻²⁰ cal
3 eV	1.1487882×10⁻¹⁹ cal
4 eV	1.5317176×10⁻¹⁹ cal
5 eV	1.914647×10⁻¹⁹ cal
6 eV	2.2975764×10⁻¹⁹ cal
7 eV	2.6805058×10⁻¹⁹ cal
8 eV	3.0634352×10⁻¹⁹ cal
9 eV	3.4463647×10⁻¹⁹ cal
10 eV	3.8292941×10⁻¹⁹ cal

Electronvolts to calories: 12–1,000 eV
Electronvolts (eV)	Calories (cal)
12 eV	4.5951529×10⁻¹⁹ cal
15 eV	5.7439411×10⁻¹⁹ cal
20 eV	7.6585881×10⁻¹⁹ cal
25 eV	9.5732351×10⁻¹⁹ cal
30 eV	1.1487882×10⁻¹⁸ cal
40 eV	1.5317176×10⁻¹⁸ cal
50 eV	1.914647×10⁻¹⁸ cal
75 eV	2.8719705×10⁻¹⁸ cal
100 eV	3.8292941×10⁻¹⁸ cal
250 eV	9.5732351×10⁻¹⁸ cal
500 eV	1.914647×10⁻¹⁷ cal
1,000 eV	3.8292941×10⁻¹⁷ cal

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).

Calorie (cal)

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

Frequently asked questions

How many calories are in one electronvolt?

There are 3.829294058×10⁻²⁰ calories in one electronvolt, and this value is exact by definition.

How do I convert electronvolts to calories?

Multiply the number of electronvolts by 3.829294058×10⁻²⁰. For example, 10 eV × 3.829294058×10⁻²⁰ = 3.829294058×10⁻¹⁹ cal.

How many electronvolts are in one calorie?

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

What is 10 electronvolts in calories?

10 eV = 3.829294058×10⁻¹⁹ cal.

Is this eV to cal 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.

eV to Calories Converter