A standard atmosphere is exactly 101,325 pascals.
Atmospheres to Ronnapascals Converter — atm to RPa
Convert Atmosphere (atm) to Ronnapascal (RPa) using the exact conversion factor (1 atmosphere = 1.01325e-22 ronnapascal). See the formula, worked examples, conversion table, and common uses.
Atmospheres to Ronnapascals 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.
Ronnapascal is 1e+27 pascal units.
Result = input x 101325 / 1e+27.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Atmospheres to Ronnapascals
Atmosphere and Ronnapascal 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. Atmosphere is most often used for chemistry (standard conditions are often defined at 1 atm).
Formula
ronnapascals = atmospheres × 1.01325e-22
This factor comes from each unit's defined relationship to the category's base unit: 1 atmosphere equals 101325 base units, and 1 ronnapascal equals 1e+27 base units, so dividing one by the other gives the direct atmosphere-to-ronnapascal factor of 1.01325e-22.
Simple example
1 atm × 1.01325e-22 = 1.01325e-22 RPa
1 atmosphere = 1.01325e-22 ronnapascals.
Real-world example
35 atm × 1.01325e-22 = 3.546375e-21 RPa
35 atmospheres = 3.546375e-21 ronnapascals.
Conversion table
| Atmosphere (atm) | Ronnapascal (RPa) |
|---|---|
| 1 atm | 1.01325e-22 RPa |
| 5 atm | 5.06625e-22 RPa |
| 10 atm | 1.01325e-21 RPa |
| 25 atm | 2.533125e-21 RPa |
| 50 atm | 5.06625e-21 RPa |
| 100 atm | 1.01325e-20 RPa |
Reverse conversion: Ronnapascal to Atmosphere
1.01325e-22 RPa × 9.869233e+21 = 1 atm
1.01325e-22 ronnapascals = 1 atmosphere.
atmospheres = ronnapascals × 9.869233e+21
For a page dedicated to this direction, see Ronnapascal to Atmosphere.
Understanding the Atmosphere
Atmosphere (atm) measures pressure. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. It is classified as a non-SI unit accepted for use with the SI.
Where it's used: Widely used internationally in chemistry, meteorology, and diving/aviation contexts alongside the pascal and bar
Uses of the Atmosphere today
- Chemistry (standard conditions are often defined at 1 atm)
- Diving and aviation pressure references
- General reference for everyday atmospheric pressure
Understanding the Ronnapascal (RPa)
Ronnapascal is 1e+27 pascal units.
Atmosphere — sources
- BIPM SI Brochure — Standard atmosphere listed among non-SI units with a fixed exact value in pascals.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ronnapascals are in 1 atmosphere?
1 atmosphere equals 1.01325e-22 ronnapascals, using the exact defined conversion factor rather than an estimate.
How do I convert atmosphere to ronnapascal?
Multiply the atmosphere value by 1.01325e-22. The converter above does this instantly to whatever precision you set.
How do I convert ronnapascal back to atmosphere?
Use the reverse factor: 1 ronnapascal equals 9.869233e+21 atmospheres. You can also use the swap control in the converter above to flip the direction instantly.
What is a atmosphere?
Atmosphere (atm) measures pressure. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. It is classified as a non-SI unit accepted for use with the SI.
What is a ronnapascal?
Ronnapascal (RPa) is a unit of pressure.
Is the atmosphere to ronnapascal conversion exact?
Yes. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the atmosphere still used today?
Widely used internationally in chemistry, meteorology, and diving/aviation contexts alongside the pascal and bar