BTU to kJ Converter
Quick answer: To convert BTU to kJ, multiply by 1.055056. For example, 10 Btu is 10.55056 kJ. One british thermal unit equals 1.055056 kJ.
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Use the BTU to kJ Converter
BTU to kJ formula and what each symbol means
kJ = Btu × 1.055056
| Symbol | Meaning |
|---|---|
| Btu | British thermal unit |
| kJ | Kilojoule |
BTU to kJ examples
1 Btu
1 Btu × 1.055056 = 1.055056 kJ.
10 Btu
10 Btu × 1.055056 = 10.55056 kJ.
100 Btu
100 Btu × 1.055056 = 105.5056 kJ.
BTU compared with kJ
One Btu is 1.055 times as large as one kJ, so your number gets bigger when you convert BTU to kJ and smaller when you convert back. If the answer is not larger than what you typed, you divided instead of multiplying.
About BTU and kJ
British thermal unit (Btu): International Table British thermal unit, 1,055.05585262 joules. Kilojoule (kJ): 1,000 joules.
Where BTU to kJ conversions are used
Engineering and physics calculations usually work in joules. Food labels show kilocalories or kilojoules, and electricity bills use kilowatt-hours.
How to calculate BTU to kJ step by step
- Enter the value in Btu (the starting unit).
- Multiply by 1.055056, because 1 Btu = 1.055056 kJ.
- The product is the value in kJ. To go back, divide by 1.055056 or multiply by 0.9478171.
Popular energy conversions
How to read your BTU to kJ result
Quick estimate: multiply by about 1.06 to get kJ from BTU; this is within 0.5% of the exact factor. Food labels use the kilocalorie (kcal, written Calorie in the US), electricity bills use the kilowatt hour, and heating uses the Btu.
| BTU | KJ |
|---|---|
| 1 | 1.055056 |
| 2 | 2.110112 |
| 5 | 5.275279 |
| 10 | 10.55056 |
| 20 | 21.10112 |
| 50 | 52.75279 |
| 100 | 105.5056 |
| 1,000 | 1,055.056 |
kJ to BTU: quick table
| KJ | BTU |
|---|---|
| 1 | 0.9478171 |
| 5 | 4.739086 |
| 10 | 9.478171 |
| 25 | 23.69543 |
| 50 | 47.39086 |
| 100 | 94.78171 |
| 250 | 236.9543 |
| 500 | 473.9086 |
Common mistakes when calculating BTU to kJ
- Using different Btu definitions: this tool uses the International Table Btu of 1,055.05585262 J.
- Dividing when you should multiply: from Btu to kJ multiply by 1.055056; from kJ to Btu divide by 1.055056.
BTU to kJ FAQ
How many kJ are in 1 Btu?
1 Btu equals 1.055056 kJ.
How many Btu are in 1 kJ?
1 kJ equals 0.9478171 Btu.
Is 1 Btu = 1.055056 kJ an exact conversion?
Yes. The british thermal unit and the kilojoule are both defined exactly in SI terms, so the ratio has no measurement uncertainty; 1.055056 is just that ratio shown to 7 significant figures.
What is a british thermal unit (Btu)?
International Table British thermal unit, 1,055.05585262 joules.
How can I estimate BTU to kJ in my head?
Quick estimate: multiply by about 1.06 to get kJ from BTU; this is within 0.5% of the exact factor.
What is 200 Btu in kJ?
200 Btu = 211.0112 kJ (since 200 × 1.055056).
What is 3 Btu in kJ?
3 Btu = 3.165168 kJ (since 3 × 1.055056).
What is 30 Btu in kJ?
30 Btu = 31.65168 kJ (since 30 × 1.055056).
How many decimals should I keep when converting Btu to kJ?
Match the precision of your original measurement. For example, 10.55056 kJ rounds to 10.6 kJ at 3 significant figures; keep more digits only for engineering or scientific work.
More in Energy converters
- Calories to Joules Converter
- BTU to Calories Converter
- Calories to Kilocalories Converter
- kWh to kJ Converter
- Calories to kJ Converter
- kWh to Kilocalories Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors