Attojoules to Gigajoules Converter
Enter the energy in attojoules below to convert it to gigajoules.
Convert Attojoules to Gigajoules
Enter a value in attojoules (aJ) to convert to gigajoules (GJ).
Attojoule to Gigajoule Conversion Table
Table showing various attojoule measurements converted to gigajoules. Click any preset value or arrow to load it into the converter.
How to Convert Attojoules to Gigajoules
To convert attojoules to gigajoules, multiply the energy by the following conversion ratio: 1e-27 gigajoules/attojoule.
Since one attojoule is equal to 1e-27 gigajoules, you can use this simple formula to convert:
The energy in gigajoules is equal to the energy in attojoules multiplied by 1e-27.
For example, here's how to convert 5 attojoules to gigajoules using the formula above.
How Many Gigajoules Are in an Attojoule?
There are 1e-27 gigajoules in an attojoule, which is why we use this value in the formula above.
Our attojoule to gigajoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Attojoules and gigajoules are both units used to measure energy. Keep reading to learn more about each unit.
What Is an Attojoule?
An attojoule is a unit of energy equal to 1/999,999,999,999,999,900 of a joule (1e-18 J). 10⁻¹⁸ Joules. [1]
The attojoule is classified as a metric and SI-compatible unit of energy. Attojoules can be abbreviated as aJ; for example, 1 attojoule can be written as 1 aJ.
When working with attojoules (aJ) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, attojoules (aJ) are widely used across fine-tolerance laboratory, analytical, and micro-scale energy measurements 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 attojoules (aJ) and gigajoules (GJ), keep full floating-point precision (1 aJ = 1e-27 GJ; 1 GJ = 1e+27 aJ) during intermediate calculations and round only the final gigajoule figure to match your instrument tolerance.
More Attojoule & Gigajoule Conversions
Need to calculate in the opposite direction? Use our gigajoules to attojoules calculator to switch your starting unit immediately. You can also explore related tools such as converting gigajoules to attojoules, converting joules to calories, or converting calories to joules.
Convert from Attojoules
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Attojoules (aJ) to Gigajoules (GJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Attojoule (aJ) & Gigajoule (GJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (aJ to GJ)