---
title: "Kilojoules to Joules — kJ to J converter"
description: "1 kilojoule = 1,000 joules. Convert kilojoules to joules with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/kilojoules-to-joules/
site: "At One Place"
---

# Kilojoules to joules

**1 kilojoule in joules: 1 kJ = 1,000 J**

J = kJ × 1,000

To convert kilojoules to joules, multiply by 1,000. The table below gives the values people look up most often, and the converter works for any number.

## Kilojoules to joules table

*Common kilojoule values converted to joules.*

| Kilojoules | Joules |
| --- | --- |
| 1 kJ | 1,000 |
| 2 kJ | 2,000 |
| 3 kJ | 3,000 |
| 4 kJ | 4,000 |
| 5 kJ | 5,000 |
| 10 kJ | 10,000 |
| 15 kJ | 15,000 |
| 20 kJ | 20,000 |
| 25 kJ | 25,000 |
| 30 kJ | 30,000 |
| 40 kJ | 40,000 |
| 50 kJ | 50,000 |
| 75 kJ | 75,000 |
| 100 kJ | 100,000 |
| 250 kJ | 250,000 |
| 500 kJ | 500,000 |
| 1,000 kJ | 1,000,000 |

## How the conversion works

The relationship is J = kJ × 1,000. Both units measure energy, so the conversion is a fixed factor that never changes.

## Common questions

### How many joules are in one kilojoule?

One kilojoule equals 1,000 joules. J = kJ × 1,000.

### How do you convert kilojoules to joules?

Use J = kJ × 1,000. So 10 kJ is 10,000 J.

### How many kilojoules are in one joule?

One joule equals 0.001 kilojoules, which is the reverse of the conversion above.

## Related pages

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