Pressure / Pa → atm
Convert Pascals to Standard atmospheres
Convert pressure differences or absolute pressures between consistent units. Convert Pascals (Pa) to Standard atmospheres (atm). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Standard atmospheres to Pascals →
How to convert pascals 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 Pa, b for the intermediate value in Pa, and y for the result in atm.
atm = Pa ÷ 101325
Worked examples
10 Pa ≈ 0.0000986923266716 atm
Step 1: (10 × 1) ≈ 10 Pa.
Step 2: 10 ÷ 101325 ≈ 0.0000986923266716 atm.20 Pa ≈ 0.000197384653343 atm
Step 1: (20 × 1) ≈ 20 Pa.
Step 2: 20 ÷ 101325 ≈ 0.000197384653343 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 Pascals
Pascals (Pa) measures pressure under the conventions above. The base value in Pa is (x × 1), where x is the numerical value in Pa. 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.
Pascals to standard atmospheres reference table
| Pascals (Pa) | Standard atmospheres (atm) |
|---|---|
| 1 | 0.00000986923266716 |
| 5 | 0.0000493461633358 |
| 10 | 0.0000986923266716 |
| 25 | 0.000246730816679 |
| 50 | 0.000493461633358 |
| 100 | 0.000986923266716 |
| 1000 | 0.00986923266716 |
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