Convert Electronvolts to Calories
1 electronvolt (eV) equals 3.829294058 × 10⁻²⁰ calories (cal).
1 eV = 3.829294058e-20 cal
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk electronvolt to calorie converter to paste a column from Excel.
How to Convert Electronvolt to Calorie
- 1 eV = 3.829294058 × 10⁻²⁰ cal
- 1 cal = 2.611447397 × 10¹⁹ eV
- Example: convert 15 eV to cal: 15 eV = 15 × 3.829294058 × 10⁻²⁰ cal = 5.743941087 × 10⁻¹⁹ cal
Reference conditions. cal: Thermochemical calorie, 4.184 J exactly. The International Table calorie is 4.1868 J.
Formula
cal = eV × 3.829294058317 × 10⁻²⁰
or cal = eV ÷ 2.611447396754 × 10¹⁹
Derivation from SI units:
- 1 eV = e × 1 V = 1.602176634 × 10⁻¹⁹ J (exact since 2019)
- 1 cal (thermochemical) = 4.184 J (exact)
- 1 eV = 1.602176634 × 10⁻¹⁹ J ÷ 4.184 J per cal = 3.829294058317 × 10⁻²⁰ cal
Both units are defined exactly, so the factor is exact. Electronvolt definition: electronvolt; Calorie definition: calorie.
Worked examples
- A reading of 1.5 eV converts to 5.743941087 × 10⁻²⁰ cal.
1.5 eV × 3.829294058 × 10⁻²⁰ = 5.743941087 × 10⁻²⁰ cal - A value of 13.6 eV is 5.207839919 × 10⁻¹⁹ cal.
13.6 eV × 3.829294058 × 10⁻²⁰ = 5.207839919 × 10⁻¹⁹ cal
Electronvolt to Calorie conversion table
| Electronvolts (eV) | Calories (cal) |
|---|---|
| 0.025 eV | 9.573235146 × 10⁻²² cal |
| 1 eV | 3.829294058 × 10⁻²⁰ cal |
| 1.12 eV | 4.288809345 × 10⁻²⁰ cal |
| 1.5 eV | 5.743941087 × 10⁻²⁰ cal |
| 2 eV | 7.658588117 × 10⁻²⁰ cal |
| 3 eV | 1.148788217 × 10⁻¹⁹ cal |
| 10 eV | 3.829294058 × 10⁻¹⁹ cal |
| 13.6 eV | 5.207839919 × 10⁻¹⁹ cal |
| 100 eV | 3.829294058 × 10⁻¹⁸ cal |
| 1000 eV | 3.829294058 × 10⁻¹⁷ cal |
| 1000000 eV | 3.829294058 × 10⁻¹⁴ cal |
Where it's used
Electronvolts are used for atomic and particle physics, while calories appear in chemistry and calorimetry. Both measure energy, work and heat, so the conversion is a fixed factor.
Electronvolt to other energy units
| Conversion | 1 eV equals |
|---|---|
| electronvolt to joule | 1.602176634 × 10⁻¹⁹ J |
| electronvolt to kilojoule | 1.602176634 × 10⁻²² kJ |
| electronvolt to megajoule | 1.602176634 × 10⁻²⁵ MJ |
| electronvolt to calorie | 3.829294058 × 10⁻²⁰ cal |
| electronvolt to kilocalorie | 3.829294058 × 10⁻²³ kcal |
| electronvolt to watt-hour | 4.45049065 × 10⁻²³ Wh |
| electronvolt to kilowatt-hour | 4.45049065 × 10⁻²⁶ kWh |
| electronvolt to BTU | 1.518570443 × 10⁻²² BTU |
| electronvolt to therm | 1.518933028 × 10⁻²⁷ thm |
| electronvolt to foot-pound | 1.181704842 × 10⁻¹⁹ ft·lbf |
| electronvolt to erg | 1.602176634 × 10⁻¹² erg |
Frequently asked questions
How many calories are in 1 electronvolt?
1 eV = 3.829294058 × 10⁻²⁰ cal.
How do I convert electronvolts to calories?
Multiply the value in eV by 3.829294058 × 10⁻²⁰, or divide it by 2.611447397 × 10¹⁹. For example, 15 eV × 3.829294058 × 10⁻²⁰ = 5.743941087 × 10⁻¹⁹ cal.
Is the eV to cal conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 and the fixed elementary charge e.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "calorie (thermochemical) (cal_th)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Electronvolts to Calories. Retrieved October 17, 2026, from https://scientificconverters.com/energy/electronvolts-to-calories/
IEEE
Scientific Converters, "Convert Electronvolts to Calories," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/electronvolts-to-calories/