BTUs to Joules Converter
Enter the energy in btus below to convert it to joules.
Convert BTUs to Joules
Enter a value in btus (BTU) to convert to joules (J).
British Thermal Unit to Joule Conversion Table
Table showing various british thermal unit measurements converted to joules. Click any preset value or arrow to load it into the converter.
| BTUs (BTU) | Joules (J) |
|---|---|
| 1 BTU | 1,055.0558526 J |
| 2 BTU | 2,110.1117052 J |
| 5 BTU | 5,275.2792631 J |
| 10 BTU | 10,550.5585262 J |
| 15 BTU | 15,825.8377893 J |
| 20 BTU | 21,101.1170524 J |
| 25 BTU | 26,376.3963155 J |
| 30 BTU | 31,651.6755786 J |
| 50 BTU | 52,752.792631 J |
| 75 BTU | 79,129.1889465 J |
How to Convert BTUs to Joules
To convert btus to joules, multiply the energy by the following conversion ratio: 1,055.0558526 joules/british thermal unit.
Since one british thermal unit is equal to 1,055.0558526 joules, you can use this simple formula to convert:
The energy in joules is equal to the energy in btus multiplied by 1,055.0558526.
For example, here's how to convert 1000 btus to joules using the formula above.
How Many Joules Are in a British Thermal Unit?
There are 1,055.0558526 joules in a british thermal unit, which is why we use this value in the formula above.
Our british thermal unit to joule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
BTUs and joules are both units used to measure energy. Keep reading to learn more about each unit.
What Is a British Thermal Unit?
A british thermal unit is a unit of energy equal to 1,055.0558526 joules (J), the base unit for energy. Thermal energy unit equal to 1,055.056 Joules. [1]
The british thermal unit is classified as a US customary and imperial unit of energy. BTUs can be abbreviated as BTU; for example, 1 british thermal unit can be written as 1 BTU.
When working with btus (BTU) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, btus (BTU) are widely used across large-scale industrial, bulk, and macro-level energy specifications within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is a Joule?
Coherent SI unit of energy and work (1 W·s = 1 N·m). It serves as a primary reference unit for measuring energy across scientific and practical applications. [2]
The joule is classified as an International System of Units (SI) unit of energy. Joules can be abbreviated as J; for example, 1 joule can be written as 1 J.
As the primary coherent reference unit for energy in this category, all other energy units are mathematically anchored to the joule (J).
In practice, joules (J) are widely used across standard energy applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting energy between btus (BTU) and joules (J), keep full floating-point precision (1 BTU = 1,055.0558526 J; 1 J = 0.000947817 BTU) during intermediate calculations and round only the final joule figure to match your instrument tolerance.
More British Thermal Unit & Joule Conversions
Need to calculate in the opposite direction? Use our joules to btus calculator to switch your starting unit immediately. You can also explore related tools such as converting joules to btus, converting calories to joules, or converting kilojoules to joules.
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — BTUs (BTU) to Joules (J)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: British Thermal Unit (BTU) (BTU) & Joule (J)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (BTU to J)