Rontopascal is 1e-27 pascal units.
Rontopascals to Attopascals Converter — rPa to aPa
Convert Rontopascal (rPa) to Attopascal (aPa) using the exact conversion factor (1 rontopascal = 1e-9 attopascal). See the formula, worked examples, and conversion table.
Rontopascals to Attopascals converter
Converter
Pressure Converter
Convert pascals, bars, PSI, atmospheres, mercury columns, water columns, and engineering pressure units.
Context values
Some unit families need one extra value for a physically accurate result.
Attopascal is 1e-18 pascal units.
Result = input x 1e-27 / 1e-18.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Rontopascals to Attopascals
Rontopascal and Attopascal both show up on pressure gauges — psi is standard on US tire and tool specifications, while bar is the everyday pressure unit across most of the rest of the world. Specifically: Rontopascal is 1e-27 pascal units, and attopascal is 1e-18 pascal units.
Formula
attopascals = rontopascals × 1e-9
This factor comes from each unit's defined relationship to the category's base unit: 1 rontopascal equals 1e-27 base units, and 1 attopascal equals 1e-18 base units, so dividing one by the other gives the direct rontopascal-to-attopascal factor of 1e-9.
Simple example
1 rPa × 1e-9 = 1e-9 aPa
1 rontopascal = 1e-9 attopascals.
Real-world example
35 rPa × 1e-9 = 3.5e-8 aPa
35 rontopascals = 3.5e-8 attopascals.
Conversion table
| Rontopascal (rPa) | Attopascal (aPa) |
|---|---|
| 1 rPa | 1e-9 aPa |
| 5 rPa | 5e-9 aPa |
| 10 rPa | 1e-8 aPa |
| 25 rPa | 2.5e-8 aPa |
| 50 rPa | 5e-8 aPa |
| 100 rPa | 1e-7 aPa |
Reverse conversion: Attopascal to Rontopascal
1e-9 aPa × 1000000000 = 1 rPa
1e-9 attopascals = 1 rontopascals.
rontopascals = attopascals × 1000000000
For a page dedicated to this direction, see Attopascal to Rontopascal.
Understanding the Rontopascal (rPa)
Rontopascal is 1e-27 pascal units.
Understanding the Attopascal (aPa)
Attopascal is 1e-18 pascal units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attopascals are in 1 rontopascal?
1 rontopascal equals 1e-9 attopascals, using the exact defined conversion factor rather than an estimate.
How do I convert rontopascal to attopascal?
Multiply the rontopascal value by 1e-9. The converter above does this instantly to whatever precision you set.
How do I convert attopascal back to rontopascal?
Use the reverse factor: 1 attopascal equals 1,000,000,000 rontopascals. You can also use the swap control in the converter above to flip the direction instantly.
What is a rontopascal?
Rontopascal (rPa) is a unit of pressure.
What is a attopascal?
Attopascal (aPa) is a unit of pressure.
Is the rontopascal to attopascal conversion exact?
Yes. Both rontopascal and attopascal are defined by fixed standards rather than physical artifacts, so the factor of 1e-9 used above is exact to as many digits as you choose to display.