Joule to BTU (th) Converter
Convert Joule (J) to BTU (th) (BTU) instantly. 1 J = 0.000948 BTU.
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27 units available
1 J = 0.000948 BTU
Formula:
BTU = J × 0.0009484517With your value: 1 J = 0.00094845 BTU
How big is that?
Everyday references on a logarithmic scale, all expressed in joule so you can sanity-check the result.
Other Joule to BTU (th) conversions
Joule to BTU (th) Conversion Table
| Joule (J) | BTU (th) (BTU) |
|---|---|
| 0.5 | 0.000474 |
| 1 | 0.000948 |
| 2 | 0.001897 |
| 5 | 0.004742 |
| 10 | 0.009485 |
| 15 | 0.014227 |
| 20 | 0.018969 |
| 25 | 0.023711 |
| 50 | 0.047423 |
| 100 | 0.094845 |
| 250 | 0.237113 |
| 500 | 0.474226 |
| 1000 | 0.948452 |
BTU (th) to Joule Conversion Table
| BTU (th) (BTU) | Joule (J) |
|---|---|
| 0.5 | 527.175 |
| 1 | 1,054.35 |
| 2 | 2,108.7 |
| 5 | 5,271.75 |
| 10 | 10,543.5 |
| 15 | 15,815.25 |
| 20 | 21,087 |
| 25 | 26,358.75 |
| 50 | 52,717.5 |
| 100 | 105,435 |
| 250 | 263,587.5 |
| 500 | 527,175 |
| 1000 | 1,054,350 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Joule (J)
Energy
Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
BTU (th) (BTU)
Energy
The International Table BTU is exactly 1055.055 852 62 J.
Thermochemical and 39 °F BTU definitions differ by up to 0.2 %.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Joule to BTU (th)
To convert from Joule (J) to BTU (th) (BTU), multiply the value by 0.0009484517.
Formula: BTU = J × 0.0009484517
Reverse: J = BTU × 1,054.35
Step-by-Step Example
- Start with your value in Joule. For example: 5 J
- Multiply by the conversion factor: 5 x 0.0009484517
- The result is: 0.004742 BTU
About Joule
The joule is the SI unit of energy. One joule equals the work done when a force of one newton moves an object one meter.
Common uses: physics, electrical engineering, chemistry.
About BTU (th)
The btu (th) (BTU) is a unit of energy and work. One btu (th) equals 1054.35 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: energy calculations, engineering and science, education.
Frequently Asked Questions
How many BTU (th) are in 1 Joule?
There are exactly 0.0009484517 BTU (th) in 1 Joule. This means the conversion factor from Joule to BTU (th) is 0.0009484517.
What is the formula to convert Joule to BTU (th)?
The formula to convert Joule to BTU (th) is: BTU = J × 0.0009484517. For example, to convert 10 Joule to BTU (th), you would multiply 10 by 0.0009484517.
What is a Joule?
The joule is the SI unit of energy. One joule equals the work done when a force of one newton moves an object one meter.
What is a BTU (th)?
The btu (th) (BTU) is a unit of energy and work. One btu (th) equals 1054.35 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What are the common uses of Joule?
The Joule is commonly used in physics, electrical engineering, chemistry.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). Joule to BTU (th) converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/joule-to-btu