Convert Kilocalories to Electronvolts
1 kilocalorie (kcal) equals 2.611447397 × 10²² electronvolts (eV).
1 kcal = 2.611447397e22 eV
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilocalorie to electronvolt converter to paste a column from Excel.
How to Convert Kilocalorie to Electronvolt
- 1 kcal = 2.611447397 × 10²² eV
- 1 eV = 3.829294058 × 10⁻²³ kcal
- Example: convert 15 kcal to eV: 15 kcal = 15 × 2.611447397 × 10²² eV = 3.917171095 × 10²³ eV
Reference conditions. kcal: Thermochemical kilocalorie (food Calorie), 4184 J exactly.
Formula
eV = kcal × 2.611447396754 × 10²²
Derivation from SI units:
- 1 kcal = 1000 cal = 4184 J (exact)
- 1 eV = e × 1 V = 1.602176634 × 10⁻¹⁹ J (exact since 2019)
- 1 kcal = 4184 J ÷ 1.602176634 × 10⁻¹⁹ J per eV = 2.611447396754 × 10²² eV
Both units are defined exactly, so the factor is exact. Kilocalorie definition: kilocalorie; Electronvolt definition: electronvolt.
Worked examples
- A reading of 200 kcal converts to 5.222894794 × 10²⁴ eV.
200 kcal × 2.611447397 × 10²² = 5.222894794 × 10²⁴ eV - A value of 1500 kcal is 3.917171095 × 10²⁵ eV.
1500 kcal × 2.611447397 × 10²² = 3.917171095 × 10²⁵ eV
Kilocalorie to Electronvolt conversion table
| Kilocalories (kcal) | Electronvolts (eV) |
|---|---|
| 1 kcal | 2.611447397 × 10²² eV |
| 50 kcal | 1.305723698 × 10²⁴ eV |
| 100 kcal | 2.611447397 × 10²⁴ eV |
| 150 kcal | 3.917171095 × 10²⁴ eV |
| 200 kcal | 5.222894794 × 10²⁴ eV |
| 250 kcal | 6.528618492 × 10²⁴ eV |
| 300 kcal | 7.83434219 × 10²⁴ eV |
| 500 kcal | 1.305723698 × 10²⁵ eV |
| 1000 kcal | 2.611447397 × 10²⁵ eV |
| 1500 kcal | 3.917171095 × 10²⁵ eV |
| 2000 kcal | 5.222894794 × 10²⁵ eV |
| 2500 kcal | 6.528618492 × 10²⁵ eV |
| 3000 kcal | 7.83434219 × 10²⁵ eV |
| 3500 kcal | 9.140065889 × 10²⁵ eV |
Where it's used
Kilocalories are used for food and diet energy (2000 kcal reference intake), while electronvolts appear in atomic and particle physics. Both measure energy, work and heat, so the conversion is a fixed factor.
Kilocalorie to other energy units
| Conversion | 1 kcal equals |
|---|---|
| kilocalorie to joule | 4184 J |
| kilocalorie to kilojoule | 4.184 kJ |
| kilocalorie to megajoule | 0.004184 MJ |
| kilocalorie to calorie | 1000 cal |
| kilocalorie to watt-hour | 1.162222222 Wh |
| kilocalorie to kilowatt-hour | 0.001162222222 kWh |
| kilocalorie to BTU | 3.965666831 BTU |
| kilocalorie to therm | 0.00003966613703 thm |
| kilocalorie to electronvolt | 2.611447397 × 10²² eV |
| kilocalorie to foot-pound | 3085.960033 ft·lbf |
| kilocalorie to erg | 41840000000 erg |
Frequently asked questions
How many electronvolts are in 1 kilocalorie?
1 kcal = 2.611447397 × 10²² eV.
How do I convert kilocalories to electronvolts?
Multiply the value in kcal by 2.611447397 × 10²². For example, 15 kcal × 2.611447397 × 10²² = 3.917171095 × 10²³ eV.
Is the kcal to eV 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
- 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)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 and the fixed elementary charge e.
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 Kilocalories to Electronvolts. Retrieved October 17, 2026, from https://scientificconverters.com/energy/kilocalories-to-electronvolts/
IEEE
Scientific Converters, "Convert Kilocalories to Electronvolts," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/kilocalories-to-electronvolts/