Millimeters of Mercury to Pounds per Square Inch Converter
1 millimeter of mercury ≈ 0.0193367793 pounds per square inch
Almost identical to the torr, but defined separately. This uses conventional mmHg, not a temperature-specific mercury-column realization.
1 millimeter of mercury equals 0.0193368 pounds per square inch
How to convert millimeters of mercury to pounds per square inch
Unit conversion preserves the pressure reference. Gauge pressure and absolute pressure are different readings; changing between them also needs the ambient pressure. Mercury and water-column units use the conventions stated in their unit notes.
psi = mmHg × 0.01933677928One millimeter of mercury is 0.01933677928 pounds per square inch, so a single multiplication converts any value.
0.193368 psi ≈ 10 × 0.01933677928Almost identical to the torr, but defined separately. This uses conventional mmHg, not a temperature-specific mercury-column realization.
Millimeters of mercury to pounds per square inch conversion table
Common values in millimeters of mercury, converted to pounds per square inch.
| Millimeters of mercury (mmHg) | Pounds per square inch (psi) |
|---|---|
| 1 | 0.019336779 |
| 2 | 0.038673559 |
| 3 | 0.058010338 |
| 4 | 0.077347117 |
| 5 | 0.096683896 |
| 10 | 0.19336779 |
| 20 | 0.38673559 |
| 25 | 0.48341948 |
| 50 | 0.96683896 |
| 100 | 1.9336779 |
| 250 | 4.8341948 |
| 500 | 9.6683896 |
| 1,000 | 19.336779 |
About these units
millimeter of mercurymmHg
The conventional millimetre of mercury: 133.3224 Pa, following the NIST SP 811 convention.
Reference: NIST Special Publication 811.
pound per square inchpsi
One pound-force per square inch. The US standard for tyre and fluid pressure.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.