A attojoule (aJ) is a metric-prefixed unit of energy equal to 10-18 joules, a fraction of a single joule, using the SI atto prefix.
Attojoules to Microjoules
Convert Attojoule (aJ) to Microjoule (uJ) instantly with an exact formula, conversion table, and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Energy calculator
Energy Converter
Convert attojoules (aJ) to microjoules (uJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A microjoule (uJ) is a metric-prefixed unit of energy equal to 10-6 joules, a fraction of a single joule, using the SI micro prefix.
uJ = aJ × 1.000000000e-12
Results update instantly for Attojoules to Microjoules conversions.
Reserved above the conversion cards and below the converter.
Formula
uJ = aJ × 1.000000000e-12
aJ = uJ × 1000000000000
Conversion table
| 1 aJ | 1.000000e-12 uJ |
| 5 aJ | 5.000000e-12 uJ |
| 10 aJ | 1.000000e-11 uJ |
| 20 aJ | 2.000000e-11 uJ |
| 50 aJ | 5.000000e-11 uJ |
| 100 aJ | 1.000000e-10 uJ |
| 500 aJ | 5.000000e-10 uJ |
| 1000 aJ | 1.000000e-09 uJ |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both attojoule and microjoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in attojoules by 1.000000000e-12 to get microjoules. To reverse the conversion, multiply a microjoule value by 1000000000000 to get back to attojoules.
Frequently asked questions
What is Attojoule (aJ)?
A attojoule (aJ) is a metric-prefixed unit of energy equal to 10-18 joules, a fraction of a single joule, using the SI atto prefix.
What is Microjoule (uJ)?
A microjoule (uJ) is a metric-prefixed unit of energy equal to 10-6 joules, a fraction of a single joule, using the SI micro prefix.
How do I convert attojoules to microjoules?
Multiply the attojoule value by 1.000000000e-12 to get the equivalent in microjoules. For example, 5 aJ × 1.000000000e-12 = 5.000000e-12 uJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e-12 is an exact, non-rounded value.
Can I convert microjoules back to attojoules?
Yes. Divide the microjoule value by 1.000000000e-12, or multiply it by 1000000000000, to get attojoules.
Reserved between the FAQ and the article so the page stays balanced.
About converting attojoules to microjoules
A attojoule (aJ) is a metric-prefixed unit of energy equal to 10-18 joules, a fraction of a single joule, using the SI atto prefix. A microjoule (uJ) is a metric-prefixed unit of energy equal to 10-6 joules, a fraction of a single joule, using the SI micro prefix.
Use this calculator to move between attojoules and microjoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.