PSI to mmHg Converter
psi → mmHg · 🔬 Pressure
1 PSI = 51.715096 mmHg
How to convert PSI to mmHg
To convert PSI to mmHg, multiply the value in PSI by 51.715096. For example, 5 psi = 258.57548 mmHg.
If you need to convert from PSI to mmHg, the key figure to remember is that one PSI equals 51.715096 mmHg. This page gives you a live calculator, a full reference table, and the underlying formula so you can convert psi to mmHg with complete confidence.
Pressure conversions are used in weather forecasting, engineering, diving, automotive maintenance, and industrial processes. Different fields favor different units, making conversion a regular necessity.
Understanding PSI and mmHg
The pascal is the SI unit, but it's small, so kilopascals and bars are more practical for everyday use. PSI (pounds per square inch) dominates in US engineering and tire pressures, while atmospheres provide an intuitive reference point — 1 atm is roughly the air pressure at sea level. Weather reports use hectopascals or millibars, which are numerically identical.
How accurate is this conversion?
Pressure conversions are based on fixed physical definitions. One standard atmosphere equals exactly 101,325 pascals, and 1 bar equals exactly 100,000 pascals, so all conversions here are precise.
All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.
Quick reference: common PSI to mmHg values
The most frequently searched conversions are 1 PSI = 51.715096 mmHg, 5 PSI = 258.57548 mmHg, 10 PSI = 517.15096 mmHg, and 100 PSI = 5,171.51 mmHg. The full table further down covers every common value, and the calculator handles any number you need in between.
Pro tip: For tire pressure, most vehicles specify PSI in the US and bar or kPa elsewhere. As a rule of thumb, 1 bar ≈ 14.5 PSI, so a typical 2.2 bar tire pressure is about 32 PSI.
PSI to mmHg — Conversion Table
| PSI (psi) | mmHg (mmHg) |
|---|---|
| 0.1 psi | 5.1715096 mmHg |
| 0.25 psi | 12.928774 mmHg |
| 0.5 psi | 25.857548 mmHg |
| 1 psi | 51.715096 mmHg |
| 2 psi | 103.43019 mmHg |
| 5 psi | 258.57548 mmHg |
| 10 psi | 517.15096 mmHg |
| 25 psi | 1,292.877 mmHg |
| 50 psi | 2,585.755 mmHg |
| 100 psi | 5,171.51 mmHg |
| 250 psi | 12,928.774 mmHg |
| 500 psi | 25,857.548 mmHg |
| 1000 psi | 51,715.096 mmHg |