---
title: "British thermal units to Joules — BTU to J converter"
description: "1 British thermal unit = 1,055.0559 joules. Convert British thermal units to joules with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/btu-to-joules/
site: "At One Place"
---

# British thermal units to joules

**1 British thermal unit in joules: 1 BTU = 1,055.0559 J**

J = BTU × 1,055.055853

To convert British thermal units to joules, multiply by 1,055.055853. The table below gives the values people look up most often, and the converter works for any number.

## British thermal units to joules table

*Common British thermal unit values converted to joules.*

| British thermal units | Joules |
| --- | --- |
| 1 BTU | 1,055.0559 |
| 2 BTU | 2,110.1117 |
| 3 BTU | 3,165.1676 |
| 4 BTU | 4,220.2234 |
| 5 BTU | 5,275.2793 |
| 10 BTU | 10,550.559 |
| 15 BTU | 15,825.838 |
| 20 BTU | 21,101.117 |
| 25 BTU | 26,376.396 |
| 30 BTU | 31,651.676 |
| 40 BTU | 42,202.234 |
| 50 BTU | 52,752.793 |
| 75 BTU | 79,129.189 |
| 100 BTU | 105,505.59 |
| 250 BTU | 263,763.96 |
| 500 BTU | 527,527.93 |
| 1,000 BTU | 1,055,055.9 |

## How the conversion works

The relationship is J = BTU × 1,055.055853. Both units measure energy, so the conversion is a fixed factor that never changes.

## Common questions

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

One British thermal unit equals 1,055.0559 joules. J = BTU × 1,055.055853.

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

Use J = BTU × 1,055.055853. So 10 BTU is 10,550.559 J.

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

One joule equals 0.0009478 British thermal units, which is the reverse of the conversion above.

## Related pages

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