Yoctojoule is 1e-24 joule units.
Yoctojoules to Attojoules Converter — yJ to aJ
Convert Yoctojoule (yJ) to Attojoule (aJ) using the exact conversion factor (1 yoctojoule = 0.000001 attojoule). See the formula, worked examples, and conversion table.
Yoctojoules 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-24 / 1e-18.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Yoctojoules to Attojoules
Yoctojoule 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: Yoctojoule is 1e-24 joule units, and attojoule is 1e-18 joule units.
Formula
attojoules = yoctojoules × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 yoctojoule equals 1e-24 base units, and 1 attojoule equals 1e-18 base units, so dividing one by the other gives the direct yoctojoule-to-attojoule factor of 0.000001.
Simple example
1 yJ × 0.000001 = 0.000001 aJ
1 yoctojoule = 0.000001 attojoules.
Real-world example
100 yJ × 0.000001 = 0.0001 aJ
100 yoctojoules = 0.0001 attojoules.
Conversion table
| Yoctojoule (yJ) | Attojoule (aJ) |
|---|---|
| 1 yJ | 0.000001 aJ |
| 10 yJ | 0.00001 aJ |
| 50 yJ | 0.00005 aJ |
| 100 yJ | 0.0001 aJ |
| 500 yJ | 0.0005 aJ |
| 1,000 yJ | 0.001 aJ |
Reverse conversion: Attojoule to Yoctojoule
0.000001 aJ × 1000000 = 1 yJ
0.000001 attojoules = 1 yoctojoules.
yoctojoules = attojoules × 1000000
For a page dedicated to this direction, see Attojoule to Yoctojoule.
Understanding the Yoctojoule (yJ)
Yoctojoule is 1e-24 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 yoctojoule?
1 yoctojoule equals 0.000001 attojoules, using the exact defined conversion factor rather than an estimate.
How do I convert yoctojoule to attojoule?
Multiply the yoctojoule value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert attojoule back to yoctojoule?
Use the reverse factor: 1 attojoule equals 1,000,000 yoctojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a yoctojoule?
Yoctojoule (yJ) is a unit of engineering.
What is a attojoule?
Attojoule (aJ) is a unit of engineering.
Is the yoctojoule to attojoule conversion exact?
Yes. Both yoctojoule and attojoule are defined by fixed standards rather than physical artifacts, so the factor of 0.000001 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.