Convert Electronvolts to Kilocalories
1 electronvolt (eV) equals 3.829294058 × 10⁻²³ kilocalories (kcal).
1 eV = 3.829294058e-23 kcal
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk electronvolt to kilocalorie converter to paste a column from Excel.
How to Convert Electronvolt to Kilocalorie
- 1 eV = 3.829294058 × 10⁻²³ kcal
- 1 kcal = 2.611447397 × 10²² eV
- Example: convert 15 eV to kcal: 15 eV = 15 × 3.829294058 × 10⁻²³ kcal = 5.743941087 × 10⁻²² kcal
Reference conditions. kcal: Thermochemical kilocalorie (food Calorie), 4184 J exactly.
Formula
kcal = eV × 3.829294058317 × 10⁻²³
or kcal = eV ÷ 2.611447396754 × 10²²
Derivation from SI units:
- 1 eV = e × 1 V = 1.602176634 × 10⁻¹⁹ J (exact since 2019)
- 1 kcal = 1000 cal = 4184 J (exact)
- 1 eV = 1.602176634 × 10⁻¹⁹ J ÷ 4184 J per kcal = 3.829294058317 × 10⁻²³ kcal
Both units are defined exactly, so the factor is exact. Electronvolt definition: electronvolt; Kilocalorie definition: kilocalorie.
Worked examples
- A reading of 1.5 eV converts to 5.743941087 × 10⁻²³ kcal.
1.5 eV × 3.829294058 × 10⁻²³ = 5.743941087 × 10⁻²³ kcal - A value of 13.6 eV is 5.207839919 × 10⁻²² kcal.
13.6 eV × 3.829294058 × 10⁻²³ = 5.207839919 × 10⁻²² kcal
Electronvolt to Kilocalorie conversion table
| Electronvolts (eV) | Kilocalories (kcal) |
|---|---|
| 0.025 eV | 9.573235146 × 10⁻²⁵ kcal |
| 1 eV | 3.829294058 × 10⁻²³ kcal |
| 1.12 eV | 4.288809345 × 10⁻²³ kcal |
| 1.5 eV | 5.743941087 × 10⁻²³ kcal |
| 2 eV | 7.658588117 × 10⁻²³ kcal |
| 3 eV | 1.148788217 × 10⁻²² kcal |
| 10 eV | 3.829294058 × 10⁻²² kcal |
| 13.6 eV | 5.207839919 × 10⁻²² kcal |
| 100 eV | 3.829294058 × 10⁻²¹ kcal |
| 1000 eV | 3.829294058 × 10⁻²⁰ kcal |
| 1000000 eV | 3.829294058 × 10⁻¹⁷ kcal |
Where it's used
Electronvolts are used for atomic and particle physics, while kilocalories appear in food and diet energy (2000 kcal reference intake). 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 kilocalories are in 1 electronvolt?
1 eV = 3.829294058 × 10⁻²³ kcal.
How do I convert electronvolts to kilocalories?
Multiply the value in eV by 3.829294058 × 10⁻²³, or divide it by 2.611447397 × 10²². For example, 15 eV × 3.829294058 × 10⁻²³ = 5.743941087 × 10⁻²² kcal.
Is the eV to kcal 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, "kilocalorie (thermochemical)".
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 Kilocalories. Retrieved October 17, 2026, from https://scientificconverters.com/energy/electronvolts-to-kilocalories/
IEEE
Scientific Converters, "Convert Electronvolts to Kilocalories," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/electronvolts-to-kilocalories/