---
title: "Calories to Kilojoules — cal to kJ converter"
description: "1 calorie = 0.004184 kilojoules. Convert calories to kilojoules with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/calories-to-kilojoules/
site: "At One Place"
---

# Calories to kilojoules

**1 calorie in kilojoules: 1 cal = 0.004184 kJ**

kJ = cal × 0.004184

To convert calories to kilojoules, multiply by 0.004184. The table below gives the values people look up most often, and the converter works for any number.

## Calories to kilojoules table

*Common calorie values converted to kilojoules.*

| Calories | Kilojoules |
| --- | --- |
| 1 cal | 0.004184 |
| 2 cal | 0.008368 |
| 3 cal | 0.012552 |
| 4 cal | 0.016736 |
| 5 cal | 0.02092 |
| 10 cal | 0.04184 |
| 15 cal | 0.06276 |
| 20 cal | 0.08368 |
| 25 cal | 0.1046 |
| 30 cal | 0.12552 |
| 40 cal | 0.16736 |
| 50 cal | 0.2092 |
| 75 cal | 0.3138 |
| 100 cal | 0.4184 |
| 250 cal | 1.046 |
| 500 cal | 2.092 |
| 1,000 cal | 4.184 |

## How the conversion works

The relationship is kJ = cal × 0.004184. Both units measure energy, so the conversion is a fixed factor that never changes.

> Calorie: Thermochemical (small) calorie.

## Common questions

### How many kilojoules are in one calorie?

One calorie equals 0.004184 kilojoules. kJ = cal × 0.004184.

### How do you convert calories to kilojoules?

Use kJ = cal × 0.004184. So 10 cal is 0.04184 kJ.

### How many calories are in one kilojoule?

One kilojoule equals 239.0057 calories, which is the reverse of the conversion above.

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

Thermochemical (small) calorie.

## Related pages

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