How to Convert Electronvolts to British thermal units (eV to BTU)
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 electronvolts into british thermal units by hand, with examples and a quick-reference table.
The conversion
To convert electronvolts to british thermal units, multiply the value by 1.518570e-22. To go the other way, divide by the same number (or multiply by 6.585141e+21). Because the factor is tiny, scientific notation keeps the numbers manageable.
British thermal units = electronvolts × 1.518570e-22
Worked examples
- 3 eV = 4.555711e-22 BTU
- 12.5 eV = 1.898213e-21 BTU
- 75 eV = 1.138928e-20 BTU
Electronvolts to British thermal units table
| Electronvolts | British thermal units |
|---|---|
| 1 eV | 1.518570e-22 BTU |
| 2 eV | 3.037141e-22 BTU |
| 5 eV | 7.592852e-22 BTU |
| 10 eV | 1.518570e-21 BTU |
| 20 eV | 3.037141e-21 BTU |
| 25 eV | 3.796426e-21 BTU |
| 50 eV | 7.592852e-21 BTU |
| 100 eV | 1.518570e-20 BTU |
| 250 eV | 3.796426e-20 BTU |
| 500 eV | 7.592852e-20 BTU |
| 1,000 eV | 1.518570e-19 BTU |
Common questions
Is eV to BTU 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 British thermal units to Electronvolts converter.
Mistakes to avoid
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
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.
Background
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
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.
For any value, use the Electronvolts to British thermal units Converter or browse all energy converters.
Run your own numbers: Electronvolts to British thermal units Converter