Electronvolts (eV) to Kilocalories (kcal) Conversion
Electronvolts
The electronvolt (eV) is a unit of energy equal to exactly 1.602176634 × 10⁻¹⁹ joules, defined as the kinetic energy gained by a single electron accelerated through a potential difference of one volt. It is the standard unit in particle physics, atomic physics, and solid-state physics. Visible light photons carry 1.8–3.1 eV of energy; X-ray photons carry 100 eV to 100 keV; the proton beams at CERN's LHC reach 6.5 teraelectronvolts (TeV).
Kilocalories
The kilocalorie (kcal), commonly called a "Calorie" (capital C) in nutritional contexts, is a unit of energy equal to exactly 4,184 joules. It represents the energy needed to raise 1 kg of water by 1 °C. In nutrition, all food energy values are expressed in kcal per gram: carbohydrates and protein provide 4 kcal/g; fat provides 9 kcal/g; alcohol provides 7 kcal/g. An average adult requires approximately 2,000–2,500 kcal per day to maintain body weight.
| Electronvolts (eV) | Kilocalories (kcal) |
|---|---|
| 0.1 eV | 3.8292940583174E-24 kcal |
| 1 eV | 3.8292940583174E-23 kcal |
| 2 eV | 7.6585881166348E-23 kcal |
| 3 eV | 1.1487882174952E-22 kcal |
| 5 eV | 1.9146470291587E-22 kcal |
| 10 eV | 3.8292940583174E-22 kcal |
| 20 eV | 7.6585881166348E-22 kcal |
| 30 eV | 1.1487882174952E-21 kcal |
| 50 eV | 1.9146470291587E-21 kcal |
| 100 eV | 3.8292940583174E-21 kcal |
| 1000 eV | 3.8292940583174E-20 kcal |