---
title: "Joules to British thermal units — J to BTU converter"
description: "1 joule = 0.0009478 British thermal units. Convert joules to British thermal units with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/joules-to-btu/
site: "At One Place"
---

# Joules to British thermal units

**1 joule in British thermal units: 1 J = 0.0009478 BTU**

BTU = J × 0.00094781712

To convert joules to British thermal units, multiply by 0.00094781712. The table below gives the values people look up most often, and the converter works for any number.

## Joules to British thermal units table

*Common joule values converted to British thermal units.*

| Joules | British thermal units |
| --- | --- |
| 1 J | 0.0009478 |
| 2 J | 0.0018956 |
| 3 J | 0.0028435 |
| 4 J | 0.0037913 |
| 5 J | 0.0047391 |
| 10 J | 0.0094782 |
| 15 J | 0.014217 |
| 20 J | 0.018956 |
| 25 J | 0.023695 |
| 30 J | 0.028435 |
| 40 J | 0.037913 |
| 50 J | 0.047391 |
| 75 J | 0.071086 |
| 100 J | 0.094782 |
| 250 J | 0.23695 |
| 500 J | 0.47391 |
| 1,000 J | 0.94782 |

## How the conversion works

The relationship is BTU = J × 0.00094781712. Both units measure energy, so the conversion is a fixed factor that never changes.

## Common questions

### How many British thermal units are in one joule?

One joule equals 0.0009478 British thermal units. BTU = J × 0.00094781712.

### How do you convert joules to British thermal units?

Use BTU = J × 0.00094781712. So 10 J is 0.0094782 BTU.

### How many joules are in one British thermal unit?

One British thermal unit equals 1,055.0559 joules, which is the reverse of the conversion above.

## Related pages

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

## 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/)