A kilocalorie is 1,000 calories.
Kilocalories to Electronvolts Converter — kcal to eV
Convert Kilocalorie (kcal) to Electronvolt (eV) using the exact conversion factor (1 kilocalorie = 2.611447e+22 electronvolt). See the formula, worked examples, conversion table, and common uses.
Kilocalories to Electronvolts converter
Converter
Energy Converter
Convert joules, calories, kilowatt-hours, BTU, electronvolts, therms, and mechanical work units.
Context values
Some unit families need one extra value for a physically accurate result.
An electronvolt is the energy gained by an electron across one volt.
Result = input x 4184 / 1.60217663e-19.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Kilocalories to Electronvolts
Kilocalorie and Electronvolt both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: A kilocalorie is 1,000 calories, and an electronvolt is the energy gained by an electron across one volt.
Formula
electronvolts = kilocalories × 2.611447e+22
This factor comes from each unit's defined relationship to the category's base unit: 1 kilocalorie equals 4184 base units, and 1 electronvolt equals 1.602177e-19 base units, so dividing one by the other gives the direct kilocalorie-to-electronvolt factor of 2.611447e+22.
Simple example
1 kcal × 2.611447e+22 = 2.611447e+22 eV
1 kilocalorie = 2.611447e+22 electronvolts.
Real-world example
100 kcal × 2.611447e+22 = 2.611447e+24 eV
100 kilocalories = 2.611447e+24 electronvolts.
Conversion table
| Kilocalorie (kcal) | Electronvolt (eV) |
|---|---|
| 1 kcal | 2.611447e+22 eV |
| 10 kcal | 2.611447e+23 eV |
| 100 kcal | 2.611447e+24 eV |
| 500 kcal | 1.305724e+25 eV |
| 1,000 kcal | 2.611447e+25 eV |
| 2,000 kcal | 5.222895e+25 eV |
Reverse conversion: Electronvolt to Kilocalorie
2.611447e+22 eV × 3.829294e-23 = 0.9999998481 kcal
2.611447e+22 electronvolts = 0.9999998481 kilocalories.
kilocalories = electronvolts × 3.829294e-23
For a page dedicated to this direction, see Electronvolt to Kilocalorie.
Understanding the Kilocalorie (kcal)
A kilocalorie is 1,000 calories.
Understanding the Electronvolt
Electronvolt (eV) measures energy. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. It is classified as a non-SI unit accepted for use with the SI, common in physics.
Where it's used: Standard unit throughout particle physics, atomic physics, and chemistry worldwide
Uses of the Electronvolt today
- Particle physics (particle accelerator energies are often quoted in GeV or TeV)
- Atomic and molecular energy levels
- Semiconductor band-gap energies
Electronvolt — sources
- BIPM SI Brochure, 9th edition — Electronvolt listed as a non-SI unit accepted for use with the SI, with its exact value fixed via the elementary charge.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many electronvolts are in 1 kilocalorie?
1 kilocalorie equals 2.611447e+22 electronvolts, using the exact defined conversion factor rather than an estimate.
How do I convert kilocalorie to electronvolt?
Multiply the kilocalorie value by 2.611447e+22. The converter above does this instantly to whatever precision you set.
How do I convert electronvolt back to kilocalorie?
Use the reverse factor: 1 electronvolt equals 3.829294e-23 kilocalories. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilocalorie?
Kilocalorie (kcal) is a unit of energy.
What is a electronvolt?
Electronvolt (eV) measures energy. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. It is classified as a non-SI unit accepted for use with the SI, common in physics.
Is the kilocalorie to electronvolt conversion exact?
Yes. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.