Attojoule is 1e-18 joule units.
Attojoules to Yoctojoules Converter — aJ to yJ
Convert Attojoule (aJ) to Yoctojoule (yJ) using the exact conversion factor (1 attojoule = 1,000,000 yoctojoule). See the formula, worked examples, and conversion table.
Attojoules to Yoctojoules 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.
Yoctojoule is 1e-24 joule units.
Result = input x 1e-18 / 1e-24.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Attojoules to Yoctojoules
Attojoule and Yoctojoule 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: Attojoule is 1e-18 joule units, and yoctojoule is 1e-24 joule units.
Formula
yoctojoules = attojoules × 1000000
This factor comes from each unit's defined relationship to the category's base unit: 1 attojoule equals 1e-18 base units, and 1 yoctojoule equals 1e-24 base units, so dividing one by the other gives the direct attojoule-to-yoctojoule factor of 1000000.
Simple example
1 aJ × 1000000 = 1,000,000 yJ
1 attojoule = 1,000,000 yoctojoules.
Real-world example
100 aJ × 1000000 = 100,000,000 yJ
100 attojoules = 100,000,000 yoctojoules.
Conversion table
| Attojoule (aJ) | Yoctojoule (yJ) |
|---|---|
| 1 aJ | 1,000,000 yJ |
| 10 aJ | 10,000,000 yJ |
| 50 aJ | 50,000,000 yJ |
| 100 aJ | 100,000,000 yJ |
| 500 aJ | 500,000,000 yJ |
| 1,000 aJ | 1,000,000,000 yJ |
Reverse conversion: Yoctojoule to Attojoule
1 yJ × 0.000001 = 0.000001 aJ
1 yoctojoule = 0.000001 attojoules.
attojoules = yoctojoules × 0.000001
For a page dedicated to this direction, see Yoctojoule to Attojoule.
Understanding the Attojoule (aJ)
Attojoule is 1e-18 joule units.
Understanding the Yoctojoule (yJ)
Yoctojoule is 1e-24 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many yoctojoules are in 1 attojoule?
1 attojoule equals 1,000,000 yoctojoules, using the exact defined conversion factor rather than an estimate.
How do I convert attojoule to yoctojoule?
Multiply the attojoule value by 1000000. The converter above does this instantly to whatever precision you set.
How do I convert yoctojoule back to attojoule?
Use the reverse factor: 1 yoctojoule equals 0.000001 attojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a attojoule?
Attojoule (aJ) is a unit of engineering.
What is a yoctojoule?
Yoctojoule (yJ) is a unit of engineering.
Is the attojoule to yoctojoule conversion exact?
Yes. Both attojoule and yoctojoule are defined by fixed standards rather than physical artifacts, so the factor of 1000000 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.