Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Pounds per square inch to Atmospheres
Convert psi to atm instantly, then review the formula, assumptions, and rounding guidance.
Pressure & stressInstant result
Decimals
Formula result = input × 6894.757293 ÷ 101325. 1 psi = 0.068 atm
Common examples
One value, several units
Pascals6,894.7573 Pa
Kilopascals6.8948 kPa
Megapascals0.0069 MPa
Bar0.0689 bar
Atmospheres0.068 atm
Millimetres of mercury51.7149 mmHg
Conversion table
| psi | atm |
|---|---|
| 1 psi | 0.068 atm |
| 2 psi | 0.1361 atm |
| 5 psi | 0.3402 atm |
| 10 psi | 0.6805 atm |
| 25 psi | 1.7011 atm |
| 50 psi | 3.4023 atm |
| 100 psi | 6.8046 atm |
Conversion chart
1 psi0.068 atm
5 psi0.3402 atm
10 psi0.6805 atm
25 psi1.7011 atm
50 psi3.4023 atm
Worked example
Standard atmosphere is 101,325 pascals.
Unit definition
Pounds per square inch (psi) One pounds per square inch equals 6,894.757293 pascal.
Unit history
Pounds per square inch 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 psi to pascal.
3. Convert the base value to atm and apply your display precision.
Understand the result before using it
Pounds per square inch to Atmospheres converts a value measured in Pounds per square inch (psi) 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 × 6894.757293 ÷ 101325
Assumptions
- Pounds per square inch and Atmospheres represent the same pressure & stress quantity.
- The input is expressed in psi; the output is expressed in atm.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 psi = 0.0680459639082 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 psi measurement in a document that expects atm.
- Compare a pounds per square inch value with a value reported in atmospheres.
- Check the psi-to-atm arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse psi 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 Pounds per square inch to Atmospheres?
result = input × 6894.757293 ÷ 101325 Using the displayed relationship, 1 psi equals 0.0680459639082 atm.
How many Atmospheres are in one Pounds per square inch?
One Pounds per square inch is 0.0680459639082 Atmospheres. The displayed digits may be rounded.
Can I reverse the psi to atm conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts atm back to psi.
Is the Pounds per square inch 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.