---
title: "Calories to Joules — cal to J converter"
description: "1 calorie = 4.184 joules. Convert calories to joules with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/calories-to-joules/
site: "At One Place"
---

# Calories to joules

**1 calorie in joules: 1 cal = 4.184 J**

J = cal × 4.184

To convert calories to joules, multiply by 4.184. The table below gives the values people look up most often, and the converter works for any number.

## Calories to joules table

*Common calorie values converted to joules.*

| Calories | Joules |
| --- | --- |
| 1 cal | 4.184 |
| 2 cal | 8.368 |
| 3 cal | 12.552 |
| 4 cal | 16.736 |
| 5 cal | 20.92 |
| 10 cal | 41.84 |
| 15 cal | 62.76 |
| 20 cal | 83.68 |
| 25 cal | 104.6 |
| 30 cal | 125.52 |
| 40 cal | 167.36 |
| 50 cal | 209.2 |
| 75 cal | 313.8 |
| 100 cal | 418.4 |
| 250 cal | 1,046 |
| 500 cal | 2,092 |
| 1,000 cal | 4,184 |

## How the conversion works

The relationship is J = cal × 4.184. Both units measure energy, so the conversion is a fixed factor that never changes.

> Calorie: Thermochemical (small) calorie.

## Common questions

### How many joules are in one calorie?

One calorie equals 4.184 joules. J = cal × 4.184.

### How do you convert calories to joules?

Use J = cal × 4.184. So 10 cal is 41.84 J.

### How many calories are in one joule?

One joule equals 0.23901 calories, which is the reverse of the conversion above.

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

Thermochemical (small) calorie.

## Related pages

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