Pressure / Torr → atm
Convert Torr to Standard atmospheres
Convert pressure differences or absolute pressures between consistent units. Convert Torr (Torr) to Standard atmospheres (atm). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Standard atmospheres to Torr →
How to convert torr 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 Torr, b for the intermediate value in Pa, and y for the result in atm.
atm = Torr × 133.32236842105263 ÷ 101325
Worked examples
10 Torr ≈ 0.0131578947368 atm
Step 1: (10 × 133.322368421) ≈ 1333.22368421 Pa.
Step 2: 1333.22368421 ÷ 101325 ≈ 0.0131578947368 atm.20 Torr ≈ 0.0263157894737 atm
Step 1: (20 × 133.322368421) ≈ 2666.44736842 Pa.
Step 2: 2666.44736842 ÷ 101325 ≈ 0.0263157894737 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 Torr
Torr (Torr) measures pressure under the conventions above. The base value in Pa is (x × 133.322368421), where x is the numerical value in Torr. 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.
Torr to standard atmospheres reference table
| Torr (Torr) | Standard atmospheres (atm) |
|---|---|
| 1 | 0.00131578947368 |
| 5 | 0.00657894736842 |
| 10 | 0.0131578947368 |
| 25 | 0.0328947368421 |
| 50 | 0.0657894736842 |
| 100 | 0.131578947368 |
| 1000 | 1.31578947368 |
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