Pressure / psi → atm
Convert Pounds-force per square inch to Standard atmospheres
Convert pressure differences or absolute pressures between consistent units. Convert Pounds-force per square inch (psi) to Standard atmospheres (atm). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Standard atmospheres to Pounds-force per square inch →
How to convert pounds-force per square inch to standard atmospheres
This changes units only. Gauge and absolute pressures need a known ambient pressure to relate them; the converter does not add atmospheric pressure.
Use x for the value in psi, b for the intermediate value in Pa, and y for the result in atm.
atm = psi × 6894.757293168361 ÷ 101325
Worked examples
10 psi ≈ 0.680459639099 atm
Step 1: (10 × 6894.75729317) ≈ 68947.5729317 Pa.
Step 2: 68947.5729317 ÷ 101325 ≈ 0.680459639099 atm.20 psi ≈ 1.3609192782 atm
Step 1: (20 × 6894.75729317) ≈ 137895.145863 Pa.
Step 2: 137895.145863 ÷ 101325 ≈ 1.3609192782 atm.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Pounds-force per square inch
Pounds-force per square inch (psi) measures pressure under the conventions above. The base value in Pa is (x × 6894.75729317), where x is the numerical value in psi. Factors shown here are rounded for display; calculations use the stored factor.
About Standard atmospheres
Standard atmospheres (atm) measures pressure under the conventions above. The base value in Pa is (x × 101325), where x is the numerical value in atm. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Pounds-force per square inch to standard atmospheres reference table
| Pounds-force per square inch (psi) | Standard atmospheres (atm) |
|---|---|
| 1 | 0.0680459639099 |
| 5 | 0.340229819549 |
| 10 | 0.680459639099 |
| 25 | 1.70114909775 |
| 50 | 3.40229819549 |
| 100 | 6.80459639099 |
| 1000 | 68.0459639099 |
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