---
title: "Kilojoules to Watt-hours — kJ to Wh converter"
description: "1 kilojoule = 0.27778 watt-hours. Convert kilojoules to watt-hours with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/kilojoules-to-watt-hours/
site: "At One Place"
---

# Kilojoules to watt-hours

**1 kilojoule in watt-hours: 1 kJ = 0.27778 Wh**

Wh = kJ × 5/18

To convert kilojoules to watt-hours, multiply by 0.2777777778. The table below gives the values people look up most often, and the converter works for any number.

## Kilojoules to watt-hours table

*Common kilojoule values converted to watt-hours.*

| Kilojoules | Watt-hours |
| --- | --- |
| 1 kJ | 0.27778 |
| 2 kJ | 0.55556 |
| 3 kJ | 0.83333 |
| 4 kJ | 1.111111 |
| 5 kJ | 1.388889 |
| 10 kJ | 2.777778 |
| 15 kJ | 4.166667 |
| 20 kJ | 5.555556 |
| 25 kJ | 6.944444 |
| 30 kJ | 8.333333 |
| 40 kJ | 11.11111 |
| 50 kJ | 13.88889 |
| 75 kJ | 20.83333 |
| 100 kJ | 27.77778 |
| 250 kJ | 69.44444 |
| 500 kJ | 138.8889 |
| 1,000 kJ | 277.7778 |

## How the conversion works

The relationship is Wh = kJ × 5/18. Both units measure energy, so the conversion is a fixed factor that never changes.

## Common questions

### How many watt-hours are in one kilojoule?

One kilojoule equals 0.27778 watt-hours. Wh = kJ × 5/18.

### How do you convert kilojoules to watt-hours?

Use Wh = kJ × 5/18. So 10 kJ is 2.777778 Wh.

### How many kilojoules are in one watt-hour?

One watt-hour equals 3.6 kilojoules, which is the reverse of the conversion above.

## Related pages

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