What this tool does
Converts between pascal, kilopascal, bar, millibar, PSI, atmosphere (atm), and mmHg simultaneously.
Converter and calculator
Pressure Converter
Convert between pascals, bar, PSI, atmospheres, mmHg, and other pressure units. Covers physics, engineering, and medical uses.
Complete guide
How to use Pressure Converter
Unit converters guide for pressure converter users.
Pressure is measured in different units across industries: PSI for tyre pressure and hydraulics in the US, bar in European engineering, pascals (Pa/kPa) in physics and meteorology, and mmHg in medical (blood pressure) contexts.
Key conversions
1 atm = 101,325 Pa = 1.01325 bar = 14.696 PSI. 1 bar = 100,000 Pa. 1 PSI = 6,894.76 Pa.
Common uses
Tyre pressure: PSI (US) or bar (EU). Blood pressure: mmHg. Weather: millibar (hPa). Engineering: bar or PSI.
Quick checklist
- Tyre pressure: 30–35 PSI ≈ 2.0–2.4 bar for most cars.
- Blood pressure: 120/80 mmHg is normal. mmHg = torr in modern usage.
- Standard atmospheric pressure: 1 atm = 1013.25 mbar = 14.696 PSI.
- 1 bar is just below 1 atmosphere (1 atm = 1.01325 bar).
Answers
Pressure Converter FAQs
What is PSI?
Pounds per square inch. Common in the US for tyre pressure, hydraulics, and gas cylinders.
How many PSI in a bar?
1 bar = 14.5038 PSI.
What is blood pressure measured in?
mmHg (millimetres of mercury), also called torr. 120 mmHg systolic / 80 mmHg diastolic is normal.
What is a pascal?
The SI unit of pressure. 1 Pa = 1 N/m². Standard atmospheric pressure is 101,325 Pa = 101.325 kPa.