Joules to electronvolts converter
Convert Joules (J) to electronvolts (eV). Calculate a value, check the formula and compare common measurements.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Value | Enter value using the definition in the method and example. |
| From | Select the unit or currency in which the entered number is currently expressed. |
| To | Select the unit or currency you need for the answer. |
Understanding your result
The converted value describes the same energy quantity in the selected target unit. Display rounding does not add precision to the original measurement.
Common mistakes
- Confusing the source and target units, or overlooking a prefix or case-sensitive symbol.
Check your calculation
- Convert to the target unit and then reverse the direction. Within display rounding, you should recover the original value.
Read the energy measurement guide · Calculation checks, sources and review limits
How do I convert joules to electronvolts?
Enter the value in joules to find the same energy quantity in electronvolts. The number changes to match the unit; the underlying quantity stays the same. Check the definitions below when a unit has more than one convention.
Common uses
- Compare energy amounts stated in different units.
- Translate energy measurements on a specification or meter.
How it works
For the displayed direction, 1 J equals 6241509074460000000 eV. The engine converts through the shared energy base quantity. Calories are thermochemical. BTU uses the international-table definition. Foot-pounds mean foot-pounds force. The multiplier is derived from the two centralized unit factors. Keep full precision until the final result; displayed answers use up to 12 significant digits.
Worked example
10 J converts to 62415090744600000000 eV. For the reverse direction, swap the units and enter 62415090744600000000 eV; the result is approximately 10 J.
FAQ
How do I convert J to eV?
eV = J × 6241509074460000000
Which definition is used?
Calories are thermochemical. BTU uses the international-table definition. Foot-pounds mean foot-pounds force.
Common values
Use “Swap units” above for the reverse conversion. Values below are rounded to six significant digits.
| Joules | electronvolts |
|---|---|
| 1 | 6241510000000000000 |
| 5 | 31207500000000000000 |
| 10 | 62415100000000000000 |
| 20 | 124830000000000000000 |
| 30 | 187245000000000000000 |
| 50 | 312075000000000000000 |
| 100 | 624151000000000000000 |