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Pressure
MmHg to InHg
Convert mmHg (mmHg) to inHg (inHg). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 mmHg = 0.03937 inHg
MmHg to InHg Conversion Table
Common values, ready to copy:
| mmHg | inHg |
|---|---|
| 1 mmHg | 0.03937 inHg |
| 2 mmHg | 0.07874 inHg |
| 5 mmHg | 0.19685 inHg |
| 10 mmHg | 0.393699 inHg |
| 25 mmHg | 0.984249 inHg |
| 50 mmHg | 1.9685 inHg |
| 100 mmHg | 3.937 inHg |
| 1,000 mmHg | 39.3699 inHg |
Formula
inHg = mmHg × 3.93699485e-2
Pressure is force per area. 1 atm = 101.325 kPa = 14.696 psi = 760 mmHg. Bar is a metric working unit close to atmospheric pressure (1 bar = 100 kPa).
About MmHg and InHg
MmHg (mmHg): Millimeters of mercury; the pressure exerted by a column of mercury that height; a torr is essentially identical (1 mmHg ≈ 1 torr to within 1 part in 7 million). Common uses: Blood pressure (systolic over diastolic, in mmHg), vacuum systems, barometric pressure in some medical and scientific contexts.
InHg (inHg): Inches of mercury, the imperial equivalent of mmHg; 1 inHg = 25.4 mmHg by definition. Common uses: US weather reports (atmospheric pressure in inches of mercury, standard sea-level pressure ≈ 29.92 inHg), US aviation altimeter settings, and some US vacuum-system contexts.
How the conversion works
Pressure is force per area. 1 atm = 101.325 kPa = 14.696 psi = 760 mmHg. Bar is a metric working unit close to atmospheric pressure (1 bar = 100 kPa).
The exact relationship is inHg = mmHg × 3.93699485e-2, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between mmHg and inHg comes up wherever pressure measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.