Attojoule is 1e-18 joule units.
Attojoules to Picojoules Converter — aJ to pJ
Convert Attojoule (aJ) to Picojoule (pJ) using the exact conversion factor (1 attojoule = 0.000001 picojoule). See the formula, worked examples, and conversion table.
Attojoules to Picojoules 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.
Picojoule is 1e-12 joule units.
Result = input x 1e-18 / 1e-12.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Attojoules to Picojoules
Attojoule and Picojoule 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 picojoule is 1e-12 joule units.
Formula
picojoules = attojoules × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 attojoule equals 1e-18 base units, and 1 picojoule equals 1e-12 base units, so dividing one by the other gives the direct attojoule-to-picojoule factor of 0.000001.
Simple example
1 aJ × 0.000001 = 0.000001 pJ
1 attojoule = 0.000001 picojoules.
Real-world example
100 aJ × 0.000001 = 0.0001 pJ
100 attojoules = 0.0001 picojoules.
Conversion table
| Attojoule (aJ) | Picojoule (pJ) |
|---|---|
| 1 aJ | 0.000001 pJ |
| 10 aJ | 0.00001 pJ |
| 50 aJ | 0.00005 pJ |
| 100 aJ | 0.0001 pJ |
| 500 aJ | 0.0005 pJ |
| 1,000 aJ | 0.001 pJ |
Reverse conversion: Picojoule to Attojoule
0.000001 pJ × 1000000 = 1 aJ
0.000001 picojoules = 1 attojoules.
attojoules = picojoules × 1000000
For a page dedicated to this direction, see Picojoule to Attojoule.
Understanding the Attojoule (aJ)
Attojoule is 1e-18 joule units.
Understanding the Picojoule (pJ)
Picojoule is 1e-12 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many picojoules are in 1 attojoule?
1 attojoule equals 0.000001 picojoules, using the exact defined conversion factor rather than an estimate.
How do I convert attojoule to picojoule?
Multiply the attojoule value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert picojoule back to attojoule?
Use the reverse factor: 1 picojoule equals 1,000,000 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 picojoule?
Picojoule (pJ) is a unit of engineering.
Is the attojoule to picojoule conversion exact?
Yes. Both attojoule and picojoule 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.