---
title: "British thermal units to Kilojoules — BTU to kJ converter"
description: "1 British thermal unit = 1.055056 kilojoules. Conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/btu-to-kilojoules/
site: "At One Place"
---

# British thermal units to kilojoules

**1 British thermal unit in kilojoules: 1 BTU = 1.055056 kJ**

kJ = BTU × 1.055055853

To convert British thermal units to kilojoules, multiply by 1.055055853. The table below gives the values people look up most often, and the converter works for any number.

## British thermal units to kilojoules table

*Common British thermal unit values converted to kilojoules.*

| British thermal units | Kilojoules |
| --- | --- |
| 1 BTU | 1.055056 |
| 2 BTU | 2.110112 |
| 3 BTU | 3.165168 |
| 4 BTU | 4.220223 |
| 5 BTU | 5.275279 |
| 10 BTU | 10.55056 |
| 15 BTU | 15.82584 |
| 20 BTU | 21.10112 |
| 25 BTU | 26.3764 |
| 30 BTU | 31.65168 |
| 40 BTU | 42.20223 |
| 50 BTU | 52.75279 |
| 75 BTU | 79.12919 |
| 100 BTU | 105.5056 |
| 250 BTU | 263.764 |
| 500 BTU | 527.5279 |
| 1,000 BTU | 1,055.0559 |

## How the conversion works

The relationship is kJ = BTU × 1.055055853. Both units measure energy, so the conversion is a fixed factor that never changes.

## Common questions

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

One British thermal unit equals 1.055056 kilojoules. kJ = BTU × 1.055055853.

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

Use kJ = BTU × 1.055055853. So 10 BTU is 10.55056 kJ.

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

One kilojoule equals 0.94782 British thermal units, which is the reverse of the conversion above.

## Related pages

- [Kilojoules to British thermal units](https://atoneplace.net/convert/kilojoules-to-btu/)
- [British thermal units to Joules](https://atoneplace.net/convert/btu-to-joules/)
- [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/)