Kilojoule to BTU (kJ to BTU)
Result
0.9478171203 BTU
Formula
BTU = kJ × 0.9478171203
1 kJ = 0.9478171203 BTU, and 1 BTU = 1.055055853 kJ.
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 kJ × 0.9478171203 = 0.94781712 BTU
- 10 kJ × 0.9478171203 = 9.4781712 BTU
- 100 kJ × 0.9478171203 = 94.781712 BTU
Common mistakes
- Food "Calories" (capital C) are kilocalories: a 250 Calorie snack contains 250 kcal, or 1,046 kJ.
- kW is power and kWh is energy: a 2 kW heater running for 3 hours uses 6 kWh.
- The International Table calorie (4.1868 J) is slightly larger than the thermochemical calorie (4.184 J); engineering steam tables use the former.
Kilojoule to BTU table
| Kilojoule (kJ) | BTU (BTU) |
|---|---|
| 1 | 0.94781712 |
| 2 | 1.8956342 |
| 5 | 4.7390856 |
| 10 | 9.4781712 |
| 20 | 18.956342 |
| 50 | 47.390856 |
| 100 | 94.781712 |
| 1,000 | 947.81712 |
The units
- Kilojoule (kJ)
- Kilojoule: 1,000 joules. Food labels in Australia, New Zealand and the EU show kJ.
- BTU (BTU)
- British thermal unit (International Table): 1,055.05585262 J — roughly the heat to warm one pound of water by 1 °F.
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