Kilojoules to Gigajoules Converter
Enter the energy in kilojoules below to convert it to gigajoules.
Convert Kilojoules to Gigajoules
Enter a value in kilojoules (kJ) to convert to gigajoules (GJ).
Kilojoule to Gigajoule Conversion Table
Table showing various kilojoule measurements converted to gigajoules. Click any preset value or arrow to load it into the converter.
| Kilojoules (kJ) | Gigajoules (GJ) |
|---|---|
| 1 kJ | 0.000001 GJ |
| 10 kJ | 0.00001 GJ |
| 100 kJ | 0.0001 GJ |
| 1,000 kJ | 0.001 GJ |
| 10,000 kJ | 0.01 GJ |
| 100,000 kJ | 0.1 GJ |
| 1,000,000 kJ | 1 GJ |
| 5,000,000 kJ | 5 GJ |
| 10,000,000 kJ | 10 GJ |
| 25,400,000 kJ | 25.4 GJ |
How to Convert Kilojoules to Gigajoules
To convert kilojoules to gigajoules, multiply the energy by the following conversion ratio: 0.000001 gigajoules/kilojoule.
Since one kilojoule is equal to 0.000001 gigajoules, you can use this simple formula to convert:
The energy in gigajoules is equal to the energy in kilojoules multiplied by 0.000001.
For example, here's how to convert 5 kilojoules to gigajoules using the formula above.
How Many Gigajoules Are in a Kilojoule?
There are 0.000001 gigajoules in a kilojoule, which is why we use this value in the formula above.
Our kilojoule to gigajoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Kilojoules and gigajoules are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Kilojoule?
A kilojoule is a unit of energy equal to 1,000 joules (J), the base unit for energy. Equal to 1,000 Joules. [1]
The kilojoule is classified as a metric and SI-compatible unit of energy. Kilojoules can be abbreviated as kJ; for example, 1 kilojoule can be written as 1 kJ.
In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilojoule (kJ) a convenient decimal multiple of the joule (J).
In practice, kilojoules (kJ) are widely used across large-scale industrial, bulk, and macro-level energy specifications within SI metric 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 kilojoules (kJ) and gigajoules (GJ), keep full floating-point precision (1 kJ = 0.000001 GJ; 1 GJ = 1,000,000 kJ) during intermediate calculations and round only the final gigajoule figure to match your instrument tolerance.
More Kilojoule & Gigajoule Conversions
Need to calculate in the opposite direction? Use our gigajoules to kilojoules calculator to switch your starting unit immediately. You can also explore related tools such as converting gigajoules to kilojoules, converting kilojoules to joules, or converting kilojoules to kilocalories.
Convert from Kilojoules
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Kilojoules (kJ) to Gigajoules (GJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Kilojoule (kJ) & Gigajoule (GJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (kJ to GJ)