---
title: "Joules to Electronvolts — J to eV converter"
description: "1 joule = 6.2415091 × 10^18 electronvolts. Convert joules to electronvolts with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/joules-to-electronvolts/
site: "At One Place"
---

# Joules to electronvolts

**1 joule in electronvolts: 1 J = 6.2415091 × 10^18 eV**

eV = J × 6.241509074 × 10^18

To convert joules to electronvolts, multiply by 6.241509074 × 10^18. The table below gives the values people look up most often, and the converter works for any number.

## Joules to electronvolts table

*Common joule values converted to electronvolts.*

| Joules | Electronvolts |
| --- | --- |
| 1 J | 6.2415091 × 10^18 |
| 2 J | 1.2483018 × 10^19 |
| 3 J | 1.8724527 × 10^19 |
| 4 J | 2.4966036 × 10^19 |
| 5 J | 3.1207545 × 10^19 |
| 10 J | 6.2415091 × 10^19 |
| 15 J | 9.3622636 × 10^19 |
| 20 J | 1.2483018 × 10^20 |
| 25 J | 1.5603773 × 10^20 |
| 30 J | 1.8724527 × 10^20 |
| 40 J | 2.4966036 × 10^20 |
| 50 J | 3.1207545 × 10^20 |
| 75 J | 4.6811318 × 10^20 |
| 100 J | 6.2415091 × 10^20 |
| 250 J | 1.5603773 × 10^21 |
| 500 J | 3.1207545 × 10^21 |
| 1,000 J | 6.2415091 × 10^21 |

## How the conversion works

The relationship is eV = J × 6.241509074 × 10^18. Both units measure energy, so the conversion is a fixed factor that never changes.

## Common questions

### How many electronvolts are in one joule?

One joule equals 6.2415091 × 10^18 electronvolts. eV = J × 6.241509074 × 10^18.

### How do you convert joules to electronvolts?

Use eV = J × 6.241509074 × 10^18. So 10 J is 6.2415091 × 10^19 eV.

### How many joules are in one electronvolt?

One electronvolt equals 1.602 × 10^-19 joules, which is the reverse of the conversion above.

## Related pages

- [Electronvolts to Joules](https://atoneplace.net/convert/electronvolts-to-joules/)
- [Joules to Kilojoules](https://atoneplace.net/convert/joules-to-kilojoules/)
- [Joules to Kilocalories](https://atoneplace.net/convert/joules-to-kcal/)
- [Joules to Watt-hours](https://atoneplace.net/convert/joules-to-watt-hours/)
- [Joules to Kilowatt-hours](https://atoneplace.net/convert/joules-to-kwh/)
- [Joules to British thermal units](https://atoneplace.net/convert/joules-to-btu/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)