Energy / J → eV
Convert Joules to Electronvolts
Convert work, heat, and stored energy using joules as the base. Convert Joules (J) to Electronvolts (eV). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Electronvolts to Joules →
How to convert joules to electronvolts
Calories use the thermochemical definition. Btu use the International Table definition. Food Calories are kilocalories, not single calories.
Use x for the value in J, b for the intermediate value in J, and y for the result in eV.
eV = J ÷ 1.602176634e-19
Worked examples
10 J ≈ 62415090744600000000 eV
Step 1: (10 × 1) ≈ 10 J.
Step 2: 10 ÷ 1.602176634e-19 ≈ 62415090744600000000 eV.20 J ≈ 124830181489000000000 eV
Step 1: (20 × 1) ≈ 20 J.
Step 2: 20 ÷ 1.602176634e-19 ≈ 124830181489000000000 eV.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Joules
Joules (J) measures energy under the conventions above. The base value in J is (x × 1), where x is the numerical value in J. Factors shown here are rounded for display; calculations use the stored factor.
About Electronvolts
Electronvolts (eV) measures energy under the conventions above. The base value in J is (x × 1.602176634e-19), where x is the numerical value in eV. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Joules to electronvolts reference table
| Joules (J) | Electronvolts (eV) |
|---|---|
| 1 | 6241509074460000000 |
| 5 | 31207545372300000000 |
| 10 | 62415090744600000000 |
| 25 | 156037726862000000000 |
| 50 | 312075453723000000000 |
| 100 | 624150907446000000000 |
| 1000 | 6.24150907446e+21 |
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