Microjoules to Attojoules Converter
Enter the energy in microjoules below to convert it to attojoules.
Convert Microjoules to Attojoules
Enter a value in microjoules (µJ) to convert to attojoules (aJ).
Microjoule to Attojoule Conversion Table
Table showing various microjoule measurements converted to attojoules. Click any preset value or arrow to load it into the converter.
| Microjoules (µJ) | Attojoules (aJ) |
|---|---|
| 0.0000001 µJ | 100,000 aJ |
| 0.0000002 µJ | 200,000 aJ |
| 0.0000003 µJ | 300,000 aJ |
| 0.0000004 µJ | 400,000 aJ |
| 0.0000005 µJ | 500,000 aJ |
| 0.0000006 µJ | 600,000 aJ |
| 0.0000007 µJ | 700,000 aJ |
| 0.0000008 µJ | 800,000 aJ |
| 0.0000009 µJ | 900,000 aJ |
| 0.00000001 µJ | 10,000 aJ |
How to Convert Microjoules to Attojoules
To convert microjoules to attojoules, multiply the energy by the following conversion ratio: 999,999,999,999.9999 attojoules/microjoule.
Since one microjoule is equal to 999,999,999,999.9999 attojoules, you can use this simple formula to convert:
The energy in attojoules is equal to the energy in microjoules multiplied by 999,999,999,999.9999.
For example, here's how to convert 5 microjoules to attojoules using the formula above.
How Many Attojoules Are in a Microjoule?
There are 999,999,999,999.9999 attojoules in a microjoule, which is why we use this value in the formula above.
Our microjoule to attojoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Microjoules and attojoules are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Microjoule?
A microjoule is a unit of energy equal to 1/1,000,000 of a joule (0.000001 J). One-millionth of a Joule. [1]
The microjoule is classified as a metric and SI-compatible unit of energy. Microjoules can be abbreviated as µJ; for example, 1 microjoule can be written as 1 µJ.
In the metric system, "micro" is the standard SI prefix for millionths, or 10⁻⁶. This makes the microjoule (µJ) a convenient decimal multiple of the joule (J).
In practice, microjoules (µJ) 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 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 microjoules (µJ) and attojoules (aJ), keep full floating-point precision (1 µJ = 999,999,999,999.9999 aJ; 1 aJ = 1e-12 µJ) during intermediate calculations and round only the final attojoule figure to match your instrument tolerance.
More Microjoule & Attojoule Conversions
Need to calculate in the opposite direction? Use our attojoules to microjoules calculator to switch your starting unit immediately. You can also explore related tools such as converting attojoules to microjoules, converting joules to calories, or converting calories to joules.
Convert from Microjoules
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Microjoules (µJ) to Attojoules (aJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Microjoule (µJ) & Attojoule (aJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (µJ to aJ)