Pressure Converter
Convert between Pa, bar, PSI, atm, mmHg, kPa, and more.
Common Pressure References
Frequently Asked Questions
What is 1 atmosphere in PSI?▼
Standard atmospheric pressure (1 atm) equals 14.696 PSI (pounds per square inch) or 101,325 pascals or 1.01325 bar. This is the average air pressure at sea level.
What units are used for blood pressure?▼
Blood pressure is measured in millimeters of mercury (mmHg). Normal blood pressure is 120/80 mmHg — systolic (pumping) over diastolic (resting). The mmHg unit comes from mercury manometers used historically.
What is the difference between PSI and bar?▼
PSI (pounds per square inch) is common in the US; bar is common in Europe. 1 bar ≈ 14.504 PSI. For tire pressure: 30 PSI ≈ 2.07 bar. Bar is close to 1 atm (1 atm = 1.01325 bar).
What is a pascal?▼
The pascal (Pa) is the SI unit of pressure, equal to 1 newton per square meter (N/m²). It is very small — standard atmospheric pressure is 101,325 Pa, so kilopascal (kPa) and megapascal (MPa) are more commonly used.