Quectojoule is 1e-30 joule units.
Quectojoules to Attojoules Converter — qJ to aJ
Convert Quectojoule (qJ) to Attojoule (aJ) using the exact conversion factor (1 quectojoule = 1e-12 attojoule). See the formula, worked examples, and conversion table.
Quectojoules 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-30 / 1e-18.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Quectojoules to Attojoules
Quectojoule 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: Quectojoule is 1e-30 joule units, and attojoule is 1e-18 joule units.
Formula
attojoules = quectojoules × 1e-12
This factor comes from each unit's defined relationship to the category's base unit: 1 quectojoule equals 1e-30 base units, and 1 attojoule equals 1e-18 base units, so dividing one by the other gives the direct quectojoule-to-attojoule factor of 1e-12.
Simple example
1 qJ × 1e-12 = 1e-12 aJ
1 quectojoule = 1e-12 attojoules.
Real-world example
100 qJ × 1e-12 = 1e-10 aJ
100 quectojoules = 1e-10 attojoules.
Conversion table
| Quectojoule (qJ) | Attojoule (aJ) |
|---|---|
| 1 qJ | 1e-12 aJ |
| 10 qJ | 1e-11 aJ |
| 50 qJ | 5e-11 aJ |
| 100 qJ | 1e-10 aJ |
| 500 qJ | 5e-10 aJ |
| 1,000 qJ | 1e-9 aJ |
Reverse conversion: Attojoule to Quectojoule
1e-12 aJ × 1e+12 = 1 qJ
1e-12 attojoules = 1 quectojoule.
quectojoules = attojoules × 1e+12
For a page dedicated to this direction, see Attojoule to Quectojoule.
Understanding the Quectojoule (qJ)
Quectojoule is 1e-30 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 quectojoule?
1 quectojoule equals 1e-12 attojoules, using the exact defined conversion factor rather than an estimate.
How do I convert quectojoule to attojoule?
Multiply the quectojoule value by 1e-12. The converter above does this instantly to whatever precision you set.
How do I convert attojoule back to quectojoule?
Use the reverse factor: 1 attojoule equals 1e+12 quectojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a quectojoule?
Quectojoule (qJ) is a unit of engineering.
What is a attojoule?
Attojoule (aJ) is a unit of engineering.
Is the quectojoule to attojoule conversion exact?
Yes. Both quectojoule and attojoule are defined by fixed standards rather than physical artifacts, so the factor of 1e-12 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.