Inches Of Mercury to Psi Converter
How to convert inches of mercury to psi
psi = inches of mercury ÷ 2.03602068
To convert inches of mercury to psi, divide the number of inches of mercury by 2.03602068.
1 inHg = 0.491154147 psi
Examples
- Standard sea-level atmospheric pressure, as used for altimeter settings: 29.92 inHg ÷ 2.03602068 = 14.6953321 psi
- 30 inHg ÷ 2.03602068 = 14.7346244 psi
Good to know
This is the conventional inch of mercury, about 3386.389 Pa. Values defined at a specific mercury temperature differ slightly, for example 3376.85 Pa at 60 °F.
Psi means pounds-force per square inch (lbf/in²). Gauge readings (psig) are measured relative to atmospheric pressure, absolute readings (psia) relative to a vacuum; the conversion factor is the same for both.
Inches of mercury to psi conversion table
| Inches of mercury (inHg) | Psi |
|---|---|
| 1 inHg | 0.491154147 psi |
| 5 inHg | 2.45577074 psi |
| 10 inHg | 4.91154147 psi |
| 20 inHg | 9.82308295 psi |
| 25 inHg | 12.2788537 psi |
| 28 inHg | 13.7523161 psi |
| 29 inHg | 14.2434703 psi |
| 29.5 inHg | 14.4890474 psi |
| 29.92 inHg | 14.6953321 psi |
| 30 inHg | 14.7346244 psi |
| 30.5 inHg | 14.9802015 psi |
| 31 inHg | 15.2257786 psi |
| 32 inHg | 15.7169327 psi |
| 35 inHg | 17.1903952 psi |
Unit definitions
- Inch of mercury (inHg)
- An inch of mercury is the pressure exerted by a 1 inch column of mercury, conventionally about 3386.389 pascals. It is used in the United States for barometric pressure in weather reports and aviation.
- Psi
- Psi is one pound-force per square inch, about 6894.757 pascals. It is the everyday pressure unit in the United States, used for tires, compressors and plumbing.