Joules to Attojoules Converter
Enter the energy in joules below to convert it to attojoules.
Convert Joules to Attojoules
Enter a value in joules (J) to convert to attojoules (aJ).
Joule to Attojoule Conversion Table
Table showing various joule measurements converted to attojoules. Click any preset value or arrow to load it into the converter.
| Joules (J) | Attojoules (aJ) |
|---|---|
| 0.0000001 J | 99,999,999,999.99998 aJ |
| 0.0000002 J | 199,999,999,999.99997 aJ |
| 0.0000003 J | 299,999,999,999.99994 aJ |
| 0.0000004 J | 399,999,999,999.99994 aJ |
| 0.0000005 J | 499,999,999,999.99994 aJ |
| 0.0000006 J | 599,999,999,999.9999 aJ |
| 0.0000007 J | 699,999,999,999.9999 aJ |
| 0.0000008 J | 799,999,999,999.9999 aJ |
| 0.0000009 J | 899,999,999,999.9999 aJ |
| 0.00000001 J | 9,999,999,999.999998 aJ |
How to Convert Joules to Attojoules
To convert joules to attojoules, multiply the energy by the following conversion ratio: 1e+18 attojoules/joule.
Since one joule is equal to 1e+18 attojoules, you can use this simple formula to convert:
The energy in attojoules is equal to the energy in joules multiplied by 1e+18.
For example, here's how to convert 5 joules to attojoules using the formula above.
How Many Attojoules Are in a Joule?
There are 1e+18 attojoules in a joule, which is why we use this value in the formula above.
Our joule to attojoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Joules and attojoules are both units used to measure energy. Keep reading to learn more about each unit.
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. [1]
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.
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. [2]
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.
When converting energy between joules (J) and attojoules (aJ), keep full floating-point precision (1 J = 1e+18 aJ; 1 aJ = 1e-18 J) during intermediate calculations and round only the final attojoule figure to match your instrument tolerance.
More Joule & Attojoule Conversions
Need to calculate in the opposite direction? Use our attojoules to joules calculator to switch your starting unit immediately. You can also explore related tools such as converting attojoules to joules, converting joules to calories, or converting joules to kilojoules.
Convert from Joules
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Joules (J) to Attojoules (aJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Joule (J) & Attojoule (aJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (J to aJ)