Authoritative definitions of the International System of Units and SI prefixes.
Unit conversion
Atmospheres to Pascals Converter
1 atm = 101,325 Pa. Enter a value to convert atm to Pa, then use the formula and table below. Displayed digits may be rounded.
Pressure & stressInstant result
Decimals
Formula result = input × 101325 ÷ 1. 1 atm = 101,325 Pa
Nonzero results too small for the selected decimal places use scientific notation.
Nonzero results too small for the selected decimal places use scientific notation.
Common examples
One value, several units
Pascals101,325 Pa
Kilopascals101.325 kPa
Megapascals0.1013 MPa
Bar1.0133 bar
Pounds per square inch14.6959 psi
Millimetres of mercury759.9999 mmHg
Conversion table
| atm | Pa |
|---|---|
| 1 atm | 101,325 Pa |
| 2 atm | 202,650 Pa |
| 5 atm | 506,625 Pa |
| 10 atm | 1,013,250 Pa |
| 25 atm | 2,533,125 Pa |
| 50 atm | 5,066,250 Pa |
| 100 atm | 10,132,500 Pa |
Conversion chart
1 atm101,325 Pa
5 atm506,625 Pa
10 atm1,013,250 Pa
25 atm2,533,125 Pa
50 atm5,066,250 Pa
Worked example
1 atm = 101,325 Pa. Apply the selected conversion formula to other input values.
Unit definition
Atmospheres (atm) One atmospheres equals 101,325 pascal.
Unit history
Atmospheres is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert atm to pascal.
3. Convert the base value to Pa and apply your display precision.
Understand the result before using it
Atmospheres to Pascals converts a value measured in Atmospheres (atm) into the equivalent value in Pascals (Pa). 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 × 101325 ÷ 1
Assumptions
- Atmospheres and Pascals represent the same pressure & stress quantity.
- The input is expressed in atm; the output is expressed in Pa.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 atm = 101,325 Pa. 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 atm measurement in a document that expects Pa.
- Compare a atmospheres value with a value reported in pascals.
- Check the atm to Pa arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse atm 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 Atmospheres to Pascals?
result = input × 101325 ÷ 1. Input is in atm; result is in Pa. 1 atm = 101,325 Pa. The displayed digits may be rounded.
What is 1 atm in Pa?
1 atm = 101,325 Pa. The displayed digits may be rounded.
Can I reverse the atm to Pa conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts Pa back to atm.
Is the Atmospheres to Pascals 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.