---
title: "Kilocalories to Joules — kcal to J converter"
description: "1 kilocalorie = 4,184 joules. Convert kilocalories to joules with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/kcal-to-joules/
site: "At One Place"
---

# Kilocalories to joules

**1 kilocalorie in joules: 1 kcal = 4,184 J**

J = kcal × 4,184

To convert kilocalories to joules, multiply by 4,184. The table below gives the values people look up most often, and the converter works for any number.

## Kilocalories to joules table

*Common kilocalorie values converted to joules.*

| Kilocalories | Joules |
| --- | --- |
| 1 kcal | 4,184 |
| 2 kcal | 8,368 |
| 3 kcal | 12,552 |
| 4 kcal | 16,736 |
| 5 kcal | 20,920 |
| 10 kcal | 41,840 |
| 15 kcal | 62,760 |
| 20 kcal | 83,680 |
| 25 kcal | 104,600 |
| 30 kcal | 125,520 |
| 40 kcal | 167,360 |
| 50 kcal | 209,200 |
| 75 kcal | 313,800 |
| 100 kcal | 418,400 |
| 250 kcal | 1,046,000 |
| 500 kcal | 2,092,000 |
| 1,000 kcal | 4,184,000 |

## How the conversion works

The relationship is J = kcal × 4,184. Both units measure energy, so the conversion is a fixed factor that never changes.

> Kilocalorie: The "calorie" on food labels.

## Common questions

### How many joules are in one kilocalorie?

One kilocalorie equals 4,184 joules. J = kcal × 4,184.

### How do you convert kilocalories to joules?

Use J = kcal × 4,184. So 10 kcal is 41,840 J.

### How many kilocalories are in one joule?

One joule equals 0.000239 kilocalories, which is the reverse of the conversion above.

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

The "calorie" on food labels.

## Related pages

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