Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 kcal | 2.612e+19 eV | |
| 0.01 kcal | 2.612e+20 eV | |
| 0.1 kcal | 2.612e+21 eV | |
| 1 kcal | 2.612e+22 eV | |
| 5 kcal | 1.306e+23 eV | |
| 10 kcal | 2.612e+23 eV | |
| 50 kcal | 1.306e+24 eV | |
| 100 kcal | 2.612e+24 eV | |
| 1000 kcal | 2.612e+25 eV |
Formula: Electron Volt = Kilocalorie × 2.6117e22
Multiply any kilocalorie value by 2.6117e22 to get electron volt.
Reverse: Kilocalorie = Electron Volt × 3.8289e-23
Common kilocalorie values — factor: 1 kcal = 2.6117e22 eV
| Kilocalorie (kcal) | Electron Volt (eV) | Context |
|---|---|---|
| 1 kcal | 2.612e+22 eV | 1 kcal snack |
| 10 kcal | 2.612e+23 eV | Small fruit |
| 50 kcal | 1.306e+24 eV | Cookie |
| 100 kcal | 2.612e+24 eV | Small snack |
| 200 kcal | 5.223e+24 eV | Light meal |
| 500 kcal | 1.306e+25 eV | Workout burn |
| 1,000 kcal | 2.612e+25 eV | Large meal |
| 2,000 kcal | 5.223e+25 eV | Daily intake |
| 2,500 kcal | 6.529e+25 eV | Active adult day |
| 5,000 kcal | 1.306e+26 eV | Marathon burn |
| 1e+04 kcal | 2.612e+26 eV | Ultra marathon |
| 5e+04 kcal | 1.306e+27 eV | Week intake |
| 1e+05 kcal | 2.612e+27 eV | Month intake |
| 1e+06 kcal | 2.612e+28 eV | Year intake |
| 1.000e+09 kcal | 2.612e+31 eV | Decade |
1 kcal = 2.6117e22 eV. Memorize for instant estimates.
Use 2.6117e22 as a quick mental multiplier.
Multiply result by 3.8289e-23 to recover the original kcal value.
Prescribes daily energy intake and food portion sizes in kcal.
Calculates calorie burn during workouts and links to dietary targets.
Measures energy content of food products for nutritional labeling.
Creates weight management plans based on daily kcal targets.
Optimizes pre/during/post workout nutrition using kcal calculations.
Calculates nutritional information per serving in kcal for labels.
The kilocalorie (kcal) equals 1,000 calories or 4,184 joules, and is the unit used on food labels worldwide (often written as 'Cal' with a capital C in the US). It was standardized by the International Table calorie in 1956.
Nutritionists, dietitians, and food scientists use kcal for daily energy intake recommendations. Most adults need 2,000–2,500 kcal/day. Exercise apps, fitness trackers, and dietary plans all operate on kcal.
Interesting fact: One gram of fat yields about 9 kcal, one gram of carbohydrate or protein yields about 4 kcal. A single sugar cube (4g) contains about 16 kcal.
The electron volt (eV) is the energy gained by a single electron accelerating through a potential difference of one volt, equal to approximately 1.602 × 10⁻¹⁹ joules. It was formally adopted as a unit by the IEC in 1930.
Electron volts are the standard energy unit in atomic physics, particle physics, and semiconductor engineering. Chemical bond energies are a few eV; X-ray photons are kiloelectron volts (keV); particle accelerators measure GeV and TeV.
Interesting fact: The Large Hadron Collider accelerates protons to 6.8 TeV (6.8 × 10¹² eV). Visible light photons have energies of 1.8–3.1 eV. The rest mass energy of an electron is 511 keV.
Converting kilocalorie to electron volt is common across energy, nutrition, engineering, and science. Different sectors use different energy units — joules in physics, kcal in nutrition, kWh in electricity, and BTU in HVAC — making accurate conversion essential for cross-disciplinary work and international comparisons.
Quick reference: 5 kcal = 1.3059e23 eV and 10 kcal = 2.6117e23 eV. Reverse: 1 eV = 3.8289e-23 kcal. Exact factor: 1 kcal = 2.6117e22 eV.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.