Attopascal is 1e-18 pascal units.
Attopascals to Ronnapascals Converter — aPa to RPa
Convert Attopascal (aPa) to Ronnapascal (RPa) using the exact conversion factor (1 attopascal = 1e-45 ronnapascal). See the formula, worked examples, and conversion table.
Attopascals to Ronnapascals 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.
Ronnapascal is 1e+27 pascal units.
Result = input x 1e-18 / 1e+27.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Attopascals to Ronnapascals
Attopascal and Ronnapascal 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: Attopascal is 1e-18 pascal units, and ronnapascal is 1e+27 pascal units.
Formula
ronnapascals = attopascals × 1e-45
This factor comes from each unit's defined relationship to the category's base unit: 1 attopascal equals 1e-18 base units, and 1 ronnapascal equals 1e+27 base units, so dividing one by the other gives the direct attopascal-to-ronnapascal factor of 1e-45.
Simple example
1 aPa × 1e-45 = 1e-45 RPa
1 attopascal = 1e-45 ronnapascals.
Real-world example
100 aPa × 1e-45 = 1e-43 RPa
100 attopascals = 1e-43 ronnapascals.
Conversion table
| Attopascal (aPa) | Ronnapascal (RPa) |
|---|---|
| 1 aPa | 1e-45 RPa |
| 10 aPa | 1e-44 RPa |
| 50 aPa | 5e-44 RPa |
| 100 aPa | 1e-43 RPa |
| 500 aPa | 5e-43 RPa |
| 1,000 aPa | 1e-42 RPa |
Reverse conversion: Ronnapascal to Attopascal
1e-45 RPa × 1e+45 = 1 aPa
1e-45 ronnapascals = 1 attopascal.
attopascals = ronnapascals × 1e+45
For a page dedicated to this direction, see Ronnapascal to Attopascal.
Understanding the Attopascal (aPa)
Attopascal is 1e-18 pascal units.
Understanding the Ronnapascal (RPa)
Ronnapascal is 1e+27 pascal units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ronnapascals are in 1 attopascal?
1 attopascal equals 1e-45 ronnapascals, using the exact defined conversion factor rather than an estimate.
How do I convert attopascal to ronnapascal?
Multiply the attopascal value by 1e-45. The converter above does this instantly to whatever precision you set.
How do I convert ronnapascal back to attopascal?
Use the reverse factor: 1 ronnapascal equals 1e+45 attopascals. You can also use the swap control in the converter above to flip the direction instantly.
What is a attopascal?
Attopascal (aPa) is a unit of engineering.
What is a ronnapascal?
Ronnapascal (RPa) is a unit of engineering.
Is the attopascal to ronnapascal conversion exact?
Yes. Both attopascal and ronnapascal are defined by fixed standards rather than physical artifacts, so the factor of 1e-45 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.