BTUs to Gigajoules Converter
Enter the energy in btus below to convert it to gigajoules.
Convert BTUs to Gigajoules
Enter a value in btus (BTU) to convert to gigajoules (GJ).
British Thermal Unit to Gigajoule Conversion Table
Table showing various british thermal unit measurements converted to gigajoules. Click any preset value or arrow to load it into the converter.
| BTUs (BTU) | Gigajoules (GJ) |
|---|---|
| 1 BTU | 0.000001055 GJ |
| 10 BTU | 0.000010551 GJ |
| 100 BTU | 0.000105506 GJ |
| 1,000 BTU | 0.0010551 GJ |
| 10,000 BTU | 0.0105506 GJ |
| 100,000 BTU | 0.1055056 GJ |
| 1,000,000 BTU | 1.0550559 GJ |
| 5,000,000 BTU | 5.2752793 GJ |
| 10,000,000 BTU | 10.5505585 GJ |
| 25,400,000 BTU | 26.7984187 GJ |
How to Convert BTUs to Gigajoules
To convert btus to gigajoules, multiply the energy by the following conversion ratio: 0.000001055 gigajoules/british thermal unit.
Since one british thermal unit is equal to 0.000001055 gigajoules, you can use this simple formula to convert:
The energy in gigajoules is equal to the energy in btus multiplied by 0.000001055.
For example, here's how to convert 5 btus to gigajoules using the formula above.
How Many Gigajoules Are in a British Thermal Unit?
There are 0.000001055 gigajoules in a british thermal unit, which is why we use this value in the formula above.
Our british thermal unit to gigajoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
BTUs and gigajoules 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 Gigajoule?
A gigajoule is a unit of energy equal to 1,000,000,000 joules (J), the base unit for energy. Equal to 1,000,000,000 Joules, common in natural gas billing. [2]
The gigajoule is classified as an International System of Units (SI) unit of energy. Gigajoules can be abbreviated as GJ; for example, 1 gigajoule can be written as 1 GJ.
In the metric system, "giga" is the standard SI prefix for billions, or 10⁹. This makes the gigajoule (GJ) a convenient decimal multiple of the joule (J).
In practice, gigajoules (GJ) are widely used across large-scale industrial, bulk, and macro-level energy specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting energy between btus (BTU) and gigajoules (GJ), keep full floating-point precision (1 BTU = 0.000001055 GJ; 1 GJ = 947,817.1203133 BTU) during intermediate calculations and round only the final gigajoule figure to match your instrument tolerance.
More British Thermal Unit & Gigajoule Conversions
Need to calculate in the opposite direction? Use our gigajoules to btus calculator to switch your starting unit immediately. You can also explore related tools such as converting gigajoules to btus, converting btus to joules, or converting btus to kilowatt-hours.
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — BTUs (BTU) to Gigajoules (GJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: British Thermal Unit (BTU) (BTU) & Gigajoule (GJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (BTU to GJ)