How to Convert Kilocalories to Electronvolts (kcal to eV)
Energy conversions link food labels in kJ and kcal, SP Group bills in kWh and air-conditioner capacity in BTU. This guide shows how to convert kilocalories into electronvolts by hand, with examples and a quick-reference table.
The conversion
To convert kilocalories to electronvolts, multiply the value by 2.611447e+22. To go the other way, divide by the same number (or multiply by 3.829294e-23). For a quick estimate, multiply by about 26,000,000,000,000,000,000,000.
Electronvolts = kilocalories × 2.611447e+22
Worked examples
- 3 kcal = 7.834342e+22 eV
- 12.5 kcal = 3.264309e+23 eV
- 75 kcal = 1.958586e+24 eV
Kilocalories to Electronvolts table
| Kilocalories | Electronvolts |
|---|---|
| 1 kcal | 2.611447e+22 eV |
| 2 kcal | 5.222895e+22 eV |
| 5 kcal | 1.305724e+23 eV |
| 10 kcal | 2.611447e+23 eV |
| 20 kcal | 5.222895e+23 eV |
| 25 kcal | 6.528618e+23 eV |
| 50 kcal | 1.305724e+24 eV |
| 100 kcal | 2.611447e+24 eV |
| 250 kcal | 6.528618e+24 eV |
| 500 kcal | 1.305724e+25 eV |
| 1,000 kcal | 2.611447e+25 eV |
Common questions
Is kcal to eV exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Electronvolts to Kilocalories converter.
Mistakes to avoid
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Background
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
For any value, use the Kilocalories to Electronvolts Converter or browse all energy converters.
Run your own numbers: Kilocalories to Electronvolts Converter