Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Pascals to Atmospheres
Convert Pa to atm instantly, then review the formula, assumptions, and rounding guidance.
Pressure & stressInstant result
Decimals
Formula result = input × 1 ÷ 101325. 1 Pa = 0 atm
Common examples
One value, several units
Kilopascals0.001 kPa
Megapascals0 MPa
Bar0 bar
Atmospheres0 atm
Pounds per square inch0.0001 psi
Millimetres of mercury0.0075 mmHg
Conversion table
| Pa | atm |
|---|---|
| 1 Pa | 0 atm |
| 2 Pa | 0 atm |
| 5 Pa | 0 atm |
| 10 Pa | 0.0001 atm |
| 25 Pa | 0.0002 atm |
| 50 Pa | 0.0005 atm |
| 100 Pa | 0.001 atm |
Conversion chart
1 Pa0 atm
5 Pa0 atm
10 Pa0.0001 atm
25 Pa0.0002 atm
50 Pa0.0005 atm
Worked example
Standard atmosphere is 101,325 pascals.
Unit definition
Pascals (Pa) One pascals equals 1 pascal.
Unit history
The pascal, named for Blaise Pascal, became the SI derived unit of pressure and equals one newton per square metre.
Step by step
1. Parse the value, including fractions.
2. Convert Pa to pascal.
3. Convert the base value to atm and apply your display precision.
Understand the result before using it
Pascals to Atmospheres converts a value measured in Pascals (Pa) into the equivalent value in Atmospheres (atm). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 1 ÷ 101325
Assumptions
- Pascals and Atmospheres represent the same pressure & stress quantity.
- The input is expressed in Pa; the output is expressed in atm.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 Pa = 0.00000986923266716 atm. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a Pa measurement in a document that expects atm.
- Compare a pascals value with a value reported in atmospheres.
- Check the Pa-to-atm arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse Pa with another unit that has a similar name or symbol.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Pascals to Atmospheres?
result = input × 1 ÷ 101325 Using the displayed relationship, 1 Pa equals 0.00000986923266716 atm.
How many Atmospheres are in one Pascals?
One Pascals is 0.00000986923266716 Atmospheres. The displayed digits may be rounded.
Can I reverse the Pa to atm conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts atm back to Pa.
Is the Pascals to Atmospheres result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.