Gigajoules to BTUs Converter
Enter the energy in gigajoules below to convert it to btus.
Convert Gigajoules to BTUs
Enter a value in gigajoules (GJ) to convert to btus (BTU).
Gigajoule to British Thermal Unit Conversion Table
Table showing various gigajoule measurements converted to btus. Click any preset value or arrow to load it into the converter.
| Gigajoules (GJ) | BTUs (BTU) |
|---|---|
| 0.0000001 GJ | 0.0947817 BTU |
| 0.0000002 GJ | 0.1895634 BTU |
| 0.0000003 GJ | 0.2843451 BTU |
| 0.0000004 GJ | 0.3791268 BTU |
| 0.0000005 GJ | 0.4739086 BTU |
| 0.0000006 GJ | 0.5686903 BTU |
| 0.0000007 GJ | 0.663472 BTU |
| 0.0000008 GJ | 0.7582537 BTU |
| 0.0000009 GJ | 0.8530354 BTU |
| 0.00000001 GJ | 0.0094782 BTU |
How to Convert Gigajoules to BTUs
To convert gigajoules to btus, multiply the energy by the following conversion ratio: 947,817.1203133 btus/gigajoule.
Since one gigajoule is equal to 947,817.1203133 btus, you can use this simple formula to convert:
The energy in btus is equal to the energy in gigajoules multiplied by 947,817.1203133.
For example, here's how to convert 5 gigajoules to btus using the formula above.
How Many BTUs Are in a Gigajoule?
There are 947,817.1203133 btus in a gigajoule, which is why we use this value in the formula above.
Our gigajoule to british thermal unit calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Gigajoules and btus are both units used to measure energy. Keep reading to learn more about each unit.
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. [1]
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.
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. [2]
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.
When converting energy between gigajoules (GJ) and btus (BTU), keep full floating-point precision (1 GJ = 947,817.1203133 BTU; 1 BTU = 0.000001055 GJ) during intermediate calculations and round only the final british thermal unit figure to match your instrument tolerance.
More Gigajoule & British Thermal Unit Conversions
Need to calculate in the opposite direction? Use our btus to gigajoules calculator to switch your starting unit immediately. You can also explore related tools such as converting btus to gigajoules, converting kilowatt-hours to btus, or converting joules to calories.
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Gigajoules (GJ) to BTUs (BTU)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Gigajoule (GJ) & British Thermal Unit (BTU) (BTU)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (GJ to BTU)