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: Torr = PSI × 51.72
Multiply any psi value by 51.72 to get torr.
Reverse: PSI = Torr × 0.01934
Common psi values — factor: 1 psi = 51.72 Torr
| PSI (psi) | Torr (Torr) | Context |
|---|---|---|
| 0.1 psi | 5.172 Torr | Very low gauge |
| 1 psi | 51.72 Torr | Low tire |
| 5 psi | 258.6 Torr | Bike inner tube low |
| 10 psi | 517.2 Torr | Low hydraulic |
| 14.7 psi | 760 Torr | 1 atm |
| 20 psi | 1,034 Torr | Soft tire |
| 30 psi | 1,551 Torr | Car tire low |
| 35 psi | 1,810 Torr | Car tire normal |
| 60 psi | 3,103 Torr | Truck tire |
| 100 psi | 5,172 Torr | Medium hydraulic |
| 150 psi | 7,757 Torr | High hydraulic |
| 1,000 psi | 5.172e+04 Torr | Industrial |
| 3,000 psi | 155,100 Torr | Scuba cylinder |
| 6,000 psi | 310,300 Torr | High-pressure cylinder |
| 1.5e+04 psi | 775,700 Torr | Waterjet |
1 psi = 51.72 Torr. 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.
The torr was named after Evangelista Torricelli, who invented the mercury barometer in 1644. One torr is defined as 1/760 of standard atmospheric pressure (133.322 Pa), and is equal to 1 mmHg at 0°C.
Torr is the standard pressure unit in vacuum science and semiconductor manufacturing. High vacuum systems operate at 10⁻³ to 10⁻⁷ torr. Ultra-high vacuum (used in particle accelerators) reaches below 10⁻¹⁰ torr.
Interesting fact: Torricelli's original barometer experiment used a 1-meter tube of mercury that settled at 760 mm above the reservoir — directly defining the unit that would later bear his name.
Converting psi to torr 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 Torr and 10 psi = 517.2 Torr. For the reverse: 1 Torr = 0.01934 psi. The exact factor is 1 psi = 51.72 Torr.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.