BTU to Kilojoule (BTU to kJ)
Result
1.055055853 Kilojoule
Formula
kJ = BTU × 1.055055853
1 BTU = 1.055055853 kJ, and 1 kJ = 0.9478171203 BTU.
The joule is the SI unit of energy. The calorie used here is the thermochemical calorie, exactly 4.184 J; a kilowatt-hour is exactly 3.6 MJ; the BTU is the International Table BTU (1,055.05585262 J).
Worked examples
- 1 BTU × 1.055055853 = 1.0550559 kJ
- 1,000 BTU × 1.055055853 = 1,055.0559 kJ
- 12,000 BTU × 1.055055853 = 12,660.67 kJ
- 100,000 BTU × 1.055055853 = 105,505.59 kJ
Things to know about BTU to kJ
- One International Table BTU is 1.05505585 kJ.
- Air-conditioner ratings are in BTU per hour, which is power: 12,000 BTU/h (one "ton" of cooling) is about 3.517 kW.
- A therm on a gas bill is 100,000 BTU, or 105.5 MJ.
BTU to Kilojoule table
| BTU (BTU) | Kilojoule (kJ) |
|---|---|
| 1 | 1.0550559 |
| 2 | 2.1101117 |
| 5 | 5.2752793 |
| 10 | 10.550559 |
| 20 | 21.101117 |
| 50 | 52.752793 |
| 100 | 105.50559 |
| 1,000 | 1,055.0559 |
| 12,000 | 12,660.67 |
| 100,000 | 105,505.59 |
The units
- BTU (BTU)
- British thermal unit (International Table): 1,055.05585262 J — roughly the heat to warm one pound of water by 1 °F.
- Kilojoule (kJ)
- Kilojoule: 1,000 joules. Food labels in Australia, New Zealand and the EU show kJ.
Sources for these factors
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
- The International System of Units (SI Brochure), 9th edition — BIPM
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy