Convert pressure units — pascal, PSI, bar, atmosphere, torr, mmHg and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 psi | 0.0517151 mmHg | |
| 0.01 psi | 0.517151 mmHg | |
| 0.1 psi | 5.17151 mmHg | |
| 1 psi | 51.7151 mmHg | |
| 5 psi | 258.575 mmHg | |
| 10 psi | 517.151 mmHg | |
| 50 psi | 2585.75 mmHg | |
| 100 psi | 5171.51 mmHg | |
| 1000 psi | 51715.1 mmHg |
Formula: mmHg = PSI × 51.72
Multiply any psi value by 51.72 to get mmhg.
Reverse: PSI = mmHg × 0.01934
Common psi values — factor: 1 psi = 51.72 mmHg
| PSI (psi) | mmHg (mmHg) | Context |
|---|---|---|
| 0.1 psi | 5.172 mmHg | Very low gauge |
| 1 psi | 51.72 mmHg | Low tire |
| 5 psi | 258.6 mmHg | Bike inner tube low |
| 10 psi | 517.2 mmHg | Low hydraulic |
| 14.7 psi | 760 mmHg | 1 atm |
| 20 psi | 1,034 mmHg | Soft tire |
| 30 psi | 1,551 mmHg | Car tire low |
| 35 psi | 1,810 mmHg | Car tire normal |
| 60 psi | 3,103 mmHg | Truck tire |
| 100 psi | 5,172 mmHg | Medium hydraulic |
| 150 psi | 7,757 mmHg | High hydraulic |
| 1,000 psi | 5.172e+04 mmHg | Industrial |
| 3,000 psi | 155,100 mmHg | Scuba cylinder |
| 6,000 psi | 310,300 mmHg | High-pressure cylinder |
| 1.5e+04 psi | 775,700 mmHg | Waterjet |
1 psi = 51.72 mmHg. Memorize for instant estimates.
Use 51.72 as a quick mental multiplier.
Multiply result by 0.01934 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.
Millimeters of mercury (mmHg) is the traditional medical pressure unit, defined as the pressure exerted by a 1 mm column of mercury at 0°C under standard gravity. It equals 133.322 Pa and is numerically identical to the torr.
Blood pressure is universally measured in mmHg worldwide: normal blood pressure is about 120/80 mmHg. Intraocular pressure (glaucoma screening) is measured in mmHg. Gas partial pressures in physiology are quoted in mmHg.
Interesting fact: The sphygmomanometer (blood pressure cuff) still uses mmHg more than 130 years after its invention, making mmHg one of the most clinically important pressure units despite not being an SI unit.
Converting psi to mmhg 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 = 258.6 mmHg and 10 psi = 517.2 mmHg. For the reverse: 1 mmHg = 0.01934 psi. The exact factor is 1 psi = 51.72 mmHg.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.