Microjoule is 0.000001 joule units.
Microjoules to Attojoules Converter — uJ to aJ
Convert Microjoule (uJ) to Attojoule (aJ) using the exact conversion factor (1 microjoule = 1,000,000,000,000 attojoule). See the formula, worked examples, and conversion table.
Microjoules to Attojoules converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Attojoule is 1e-18 joule units.
Result = input x 1e-6 / 1e-18.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Microjoules to Attojoules
Microjoule and Attojoule both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Microjoule is 0.000001 joule units, and attojoule is 1e-18 joule units.
Formula
attojoules = microjoules × 1000000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 microjoule equals 0.000001 base units, and 1 attojoule equals 1e-18 base units, so dividing one by the other gives the direct microjoule-to-attojoule factor of 1000000000000.
Simple example
1 uJ × 1000000000000 = 1,000,000,000,000 aJ
1 microjoule = 1,000,000,000,000 attojoules.
Real-world example
100 uJ × 1000000000000 = 1e+14 aJ
100 microjoules = 1e+14 attojoules.
Conversion table
| Microjoule (uJ) | Attojoule (aJ) |
|---|---|
| 1 uJ | 1,000,000,000,000 aJ |
| 10 uJ | 1e+13 aJ |
| 50 uJ | 5e+13 aJ |
| 100 uJ | 1e+14 aJ |
| 500 uJ | 5e+14 aJ |
| 1,000 uJ | 1e+15 aJ |
Reverse conversion: Attojoule to Microjoule
1 aJ × 1e-12 = 1e-12 uJ
1 attojoule = 1e-12 microjoules.
microjoules = attojoules × 1e-12
For a page dedicated to this direction, see Attojoule to Microjoule.
Understanding the Microjoule (uJ)
Microjoule is 0.000001 joule units.
Understanding the Attojoule (aJ)
Attojoule is 1e-18 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attojoules are in 1 microjoule?
1 microjoule equals 1,000,000,000,000 attojoules, using the exact defined conversion factor rather than an estimate.
How do I convert microjoule to attojoule?
Multiply the microjoule value by 1000000000000. The converter above does this instantly to whatever precision you set.
How do I convert attojoule back to microjoule?
Use the reverse factor: 1 attojoule equals 1e-12 microjoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a microjoule?
Microjoule (uJ) is a unit of engineering.
What is a attojoule?
Attojoule (aJ) is a unit of engineering.
Is the microjoule to attojoule conversion exact?
Yes. Both microjoule and attojoule are defined by fixed standards rather than physical artifacts, so the factor of 1000000000000 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.