---
title: "Joules to Kilocalories — J to kcal converter"
description: "1 joule = 0.000239 kilocalories. Convert joules to kilocalories with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/joules-to-kcal/
site: "At One Place"
---

# Joules to kilocalories

**1 joule in kilocalories: 1 J = 0.000239 kcal**

kcal = J × 0.000239005736

To convert joules to kilocalories, multiply by 0.000239005736. The table below gives the values people look up most often, and the converter works for any number.

## Joules to kilocalories table

*Common joule values converted to kilocalories.*

| Joules | Kilocalories |
| --- | --- |
| 1 J | 0.000239 |
| 2 J | 0.000478 |
| 3 J | 0.000717 |
| 4 J | 0.000956 |
| 5 J | 0.001195 |
| 10 J | 0.0023901 |
| 15 J | 0.0035851 |
| 20 J | 0.0047801 |
| 25 J | 0.0059751 |
| 30 J | 0.0071702 |
| 40 J | 0.0095602 |
| 50 J | 0.01195 |
| 75 J | 0.017925 |
| 100 J | 0.023901 |
| 250 J | 0.059751 |
| 500 J | 0.1195 |
| 1,000 J | 0.23901 |

## How the conversion works

The relationship is kcal = J × 0.000239005736. Both units measure energy, so the conversion is a fixed factor that never changes.

> Kilocalorie: The "calorie" on food labels.

## Common questions

### How many kilocalories are in one joule?

One joule equals 0.000239 kilocalories. kcal = J × 0.000239005736.

### How do you convert joules to kilocalories?

Use kcal = J × 0.000239005736. So 10 J is 0.0023901 kcal.

### How many joules are in one kilocalorie?

One kilocalorie equals 4,184 joules, which is the reverse of the conversion above.

### Is there more than one kind of kilocalorie?

The "calorie" on food labels.

## Related pages

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