How to Convert Electronvolts to Kilowatt-hours (eV to kWh)
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 kilowatt-hours by hand, with examples and a quick-reference table.
The conversion
To convert electronvolts to kilowatt-hours, multiply the value by 4.450491e-26. To go the other way, divide by the same number (or multiply by 2.246943e+25). Because the factor is tiny, scientific notation keeps the numbers manageable.
Kilowatt-hours = electronvolts × 4.450491e-26
Worked examples
- 3 eV = 1.335147e-25 kWh
- 12.5 eV = 5.563113e-25 kWh
- 75 eV = 3.337868e-24 kWh
Electronvolts to Kilowatt-hours table
| Electronvolts | Kilowatt-hours |
|---|---|
| 1 eV | 4.450491e-26 kWh |
| 2 eV | 8.900981e-26 kWh |
| 5 eV | 2.225245e-25 kWh |
| 10 eV | 4.450491e-25 kWh |
| 20 eV | 8.900981e-25 kWh |
| 25 eV | 1.112623e-24 kWh |
| 50 eV | 2.225245e-24 kWh |
| 100 eV | 4.450491e-24 kWh |
| 250 eV | 1.112623e-23 kWh |
| 500 eV | 2.225245e-23 kWh |
| 1,000 eV | 4.450491e-23 kWh |
Common questions
Is eV to kWh 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 Kilowatt-hours 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.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Background
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.
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.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
For any value, use the Electronvolts to Kilowatt-hours Converter or browse all energy converters.
Run your own numbers: Electronvolts to Kilowatt-hours Converter