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Pressure

Browse Pressure conversions

1 millimeter of mercury = 0.019337 PSI

Reviewed June 18, 2026 Linear conversions use exact SI and international definitions where available. No account, tracking login, or third-party scoring required.
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Formula Summary

Result: 1 millimeter of mercury = 0.019337 PSI

Formula: (1 x 133.322387415) / 6894.757293168361

Rounding: Displayed to 6 decimal places by default, trimmed for readability. Use Detailed or Scientific for more precision.

Unit Story

Millimeter of mercury

Millimeters of mercury come from old mercury column instruments. The unit survives in medicine and pressure readings such as blood pressure.

PSI

PSI is pressure as pounds of force spread over one square inch. It sticks because tire gauges, compressors, and shop tools still use it.

How This Conversion Works

Millimeter of mercury and PSI are both used for pressure conversions. This page converts 1 millimeter of mercury into 0.019337 PSI using the formula shown below.

Use this result for quick checks, comparisons, and everyday reference. For work that depends on exact precision, review the rounding setting and the assumption note before using the number.

The precision controls let you switch between a shorter result, the standard readable result, and scientific notation when the value is very large or very small.

Unit Notes
  • 1 millimeter of mercury (mmHg) equals 133.322387415 pascal.
  • 1 PSI (psi) equals 6894.7572931684 pascal.

Questions

How do you convert millimeter of mercury to PSI?

This page converts millimeter of mercury to PSI using this formula: (1 x 133.322387415) / 6894.757293168361.

What is 1 millimeter of mercury in PSI?

1 millimeter of mercury equals 0.019337 PSI.

How many decimals does this converter show?

Displayed to 6 decimal places by default, trimmed for readability. Use Detailed or Scientific for more precision. The precision buttons can also show a shorter result or scientific notation.

Equivalent Values
133.322387415 pascal
0.1333223874 kilopascal
0.0001333224 megapascal
0.0013332239 bar
1.3332238742 millibar
0.0013157897 standard atmosphere
0.0193367775 PSI
1 millimeter of mercury
Nearby Values
0.5 millimeter of mercury 0.0096683887 PSI
1 millimeter of mercury 0.0193367775 PSI
2 millimeter of mercury 0.0386735549 PSI
5 millimeter of mercury 0.0966838873 PSI
10 millimeter of mercury 0.1933677746 PSI
Full Details
Formula
(1 x 133.322387415) / 6894.757293168361
Rounding
Displayed to 6 decimal places by default, trimmed for readability. Use Detailed or Scientific for more precision.
Assumption
Pressure units use SI definitions. Standard atmosphere is 101325 pascals and millimeter of mercury uses 133.322387415 pascals.

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