Attopascal is 1e-18 pascal units.
Attopascals to Rontopascals Converter — aPa to rPa
Convert Attopascal (aPa) to Rontopascal (rPa) using the exact conversion factor (1 attopascal = 1,000,000,000 rontopascal). See the formula, worked examples, and conversion table.
Attopascals to Rontopascals 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.
Rontopascal is 1e-27 pascal units.
Result = input x 1e-18 / 1e-27.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Attopascals to Rontopascals
Attopascal and Rontopascal 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: Attopascal is 1e-18 pascal units, and rontopascal is 1e-27 pascal units.
Formula
rontopascals = attopascals × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 attopascal equals 1e-18 base units, and 1 rontopascal equals 1e-27 base units, so dividing one by the other gives the direct attopascal-to-rontopascal factor of 1000000000.
Simple example
1 aPa × 1000000000 = 1,000,000,000 rPa
1 attopascal = 1,000,000,000 rontopascals.
Real-world example
35 aPa × 1000000000 = 35,000,000,000 rPa
35 attopascals = 35,000,000,000 rontopascals.
Conversion table
| Attopascal (aPa) | Rontopascal (rPa) |
|---|---|
| 1 aPa | 1,000,000,000 rPa |
| 5 aPa | 5,000,000,000 rPa |
| 10 aPa | 10,000,000,000 rPa |
| 25 aPa | 25,000,000,000 rPa |
| 50 aPa | 50,000,000,000 rPa |
| 100 aPa | 100,000,000,000 rPa |
Reverse conversion: Rontopascal to Attopascal
1 rPa × 1e-9 = 1e-9 aPa
1 rontopascal = 1e-9 attopascals.
attopascals = rontopascals × 1e-9
For a page dedicated to this direction, see Rontopascal to Attopascal.
Understanding the Attopascal (aPa)
Attopascal is 1e-18 pascal units.
Understanding the Rontopascal (rPa)
Rontopascal is 1e-27 pascal units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many rontopascals are in 1 attopascal?
1 attopascal equals 1,000,000,000 rontopascals, using the exact defined conversion factor rather than an estimate.
How do I convert attopascal to rontopascal?
Multiply the attopascal value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert rontopascal back to attopascal?
Use the reverse factor: 1 rontopascal equals 1e-9 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 pressure.
What is a rontopascal?
Rontopascal (rPa) is a unit of pressure.
Is the attopascal to rontopascal conversion exact?
Yes. Both attopascal and rontopascal 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.