Home› Conversions› Pressure› InHg to Psi
Pressure
InHg to Psi
Convert inHg (inHg) to psi (psi). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 inHg = 0.491154 psi
InHg to Psi Conversion Table
Common values, ready to copy:
| inHg | psi |
|---|---|
| 1 inHg | 0.491154 psi |
| 2 inHg | 0.982308 psi |
| 5 inHg | 2.4558 psi |
| 10 inHg | 4.9115 psi |
| 25 inHg | 12.2789 psi |
| 50 inHg | 24.5577 psi |
| 100 inHg | 49.1154 psi |
| 1,000 inHg | 491.15 psi |
Formula
psi = inHg × 4.91154152e-1
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 InHg and Psi
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.
Psi (psi): Pounds-force per square inch, the customary US pressure unit; 1 psi = 6,894.76 Pa. Common uses: US tire pressure (car tires typically 30-35 psi), US gas grills (10-12 psi propane), industrial hydraulics in the US, and US plumbing pressure specifications.
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 psi = inHg × 4.91154152e-1, 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 inHg and psi 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.