Convert pressure units — Pascal, bar, PSI, atm, Torr, mmHg.
| Unit | Name | Value |
|---|---|---|
| Pa | Pascal | 6894.76 |
| kPa | Kilopascal | 6.89476 |
| bar | Bar | 0.0689476 |
| atm | Atmosphere | 0.068045991 |
| Torr | Torr / mmHg | 51.715096 |
| inHg | Inch of Mercury | 2.0360207 |
Formula: Inch Hg = PSI × 2.036
Multiply any psi value by 2.036 to get inch hg.
Reverse: PSI = Inch Hg × 0.4912
Common psi values — factor: 1 psi = 2.036 inHg
| PSI (psi) | Inch Hg (inHg) | Context |
|---|---|---|
| 0.1 psi | 0.2036 inHg | Very low gauge |
| 1 psi | 2.036 inHg | Low tire |
| 5 psi | 10.18 inHg | Bike inner tube low |
| 10 psi | 20.36 inHg | Low hydraulic |
| 14.7 psi | 29.92 inHg | 1 atm |
| 20 psi | 40.72 inHg | Soft tire |
| 30 psi | 61.08 inHg | Car tire low |
| 35 psi | 71.26 inHg | Car tire normal |
| 60 psi | 122.2 inHg | Truck tire |
| 100 psi | 203.6 inHg | Medium hydraulic |
| 150 psi | 305.4 inHg | High hydraulic |
| 1,000 psi | 2,036 inHg | Industrial |
| 3,000 psi | 6,108 inHg | Scuba cylinder |
| 6,000 psi | 1.222e+04 inHg | High-pressure cylinder |
| 1.5e+04 psi | 3.054e+04 inHg | Waterjet |
1 psi = 2.036 inHg. Memorize for instant estimates.
Use 2.036 as a quick mental multiplier.
Multiply result by 0.4912 to recover the original psi value.
Inflates and checks car, truck, and bicycle tires to specified psi pressures.
Specifies refrigerant pressures and system test pressures in psi for US equipment.
Designs hydraulic systems rated in psi for American industrial machinery.
Monitors tank pressure (3,000 psi fill) and reserve pressure on US-spec gauges.
Specifies pipe pressure ratings and test pressures in psi for US plumbing codes.
Checks oil pressure (35–65 psi), coolant pressure, and brake line pressure in psi.
PSI (pounds per square inch) is the primary pressure unit in the United States, UK, and other countries using Imperial measures. It equals the force of one pound-force applied over one square inch of area (6,894.76 Pa).
PSI is used for tire pressure (car: 30–35 psi, truck: 80–120 psi), blood pressure measurement in the US, boiler pressure ratings, and hydraulic system specifications in American engineering.
Interesting fact: The deepest ocean dive by a human (Victor Vescovo, 2019, 10,928 m) would have experienced about 15,900 psi of external pressure on the submersible hull.
Inches of mercury (inHg) is the pressure unit used in US aviation and weather reporting, defined as the pressure exerted by a 1-inch column of mercury (3,386.39 Pa). It has been standard in US aviation since the early 20th century.
US aviation altimeters are set in inHg (standard: 29.92 inHg). US weather broadcasts report barometric pressure in inHg. HVAC engineers in the US use inHg for duct static pressure measurements.
Interesting fact: Pilots set their altimeter to the local QNH (pressure at sea level) in inHg to ensure their altitude reading is accurate — a difference of 0.1 inHg causes an altimeter error of about 100 feet.
Converting psi to inch hg is a common task in engineering, medicine, meteorology, and science. Different industries and countries use different pressure units — PSI in the US, bar in Europe, mmHg in medicine, and pascals in physics — making accurate conversion essential for cross-disciplinary work.
Quick reference: 5 psi = 10.18 inHg and 10 psi = 20.36 inHg. For the reverse: 1 inHg = 0.4912 psi. The exact factor is 1 psi = 2.036 inHg.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.