Attojoule is 1e-18 joule units.
Attojoules to Rontojoules Converter — aJ to rJ
Convert Attojoule (aJ) to Rontojoule (rJ) using the exact conversion factor (1 attojoule = 1,000,000,000 rontojoule). See the formula, worked examples, and conversion table.
Attojoules to Rontojoules 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.
Rontojoule is 1e-27 joule units.
Result = input x 1e-18 / 1e-27.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Attojoules to Rontojoules
Attojoule and Rontojoule 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 rontojoule is 1e-27 joule units.
Formula
rontojoules = attojoules × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 attojoule equals 1e-18 base units, and 1 rontojoule equals 1e-27 base units, so dividing one by the other gives the direct attojoule-to-rontojoule factor of 1000000000.
Simple example
1 aJ × 1000000000 = 1,000,000,000 rJ
1 attojoule = 1,000,000,000 rontojoules.
Real-world example
100 aJ × 1000000000 = 100,000,000,000 rJ
100 attojoules = 100,000,000,000 rontojoules.
Conversion table
| Attojoule (aJ) | Rontojoule (rJ) |
|---|---|
| 1 aJ | 1,000,000,000 rJ |
| 10 aJ | 10,000,000,000 rJ |
| 50 aJ | 50,000,000,000 rJ |
| 100 aJ | 100,000,000,000 rJ |
| 500 aJ | 500,000,000,000 rJ |
| 1,000 aJ | 1e+12 rJ |
Reverse conversion: Rontojoule to Attojoule
1 rJ × 1e-9 = 1e-9 aJ
1 rontojoule = 1e-9 attojoules.
attojoules = rontojoules × 1e-9
For a page dedicated to this direction, see Rontojoule to Attojoule.
Understanding the Attojoule (aJ)
Attojoule is 1e-18 joule units.
Understanding the Rontojoule (rJ)
Rontojoule is 1e-27 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many rontojoules are in 1 attojoule?
1 attojoule equals 1,000,000,000 rontojoules, using the exact defined conversion factor rather than an estimate.
How do I convert attojoule to rontojoule?
Multiply the attojoule value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert rontojoule back to attojoule?
Use the reverse factor: 1 rontojoule equals 1e-9 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 rontojoule?
Rontojoule (rJ) is a unit of engineering.
Is the attojoule to rontojoule conversion exact?
Yes. Both attojoule and rontojoule are defined by fixed standards rather than physical artifacts, so the factor of 1000000000 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.