Pressure Converter
Convert between Pascals, kilopascals, bar, atmospheres, PSI, and mmHg.
The Pressure Converter converts between all common pressure units used in science, engineering, meteorology, and everyday applications.
Supported Units
- Pascal (Pa): SI unit of pressure (1 N/m²)
- Kilopascal (kPa): 1,000 Pascals — common in engineering
- Bar: 100,000 Pascals — close to one atmosphere
- Atmosphere (atm): 101,325 Pa — standard atmospheric pressure at sea level
- PSI: Pounds per square inch — used for tire pressure in the US
- mmHg: Millimeters of mercury — used in blood pressure and barometry
Key Equivalences
1 atm = 101.325 kPa = 1.01325 bar = 14.696 psi = 760 mmHg. Standard tire pressure is about 32 psi = 2.2 bar = 220 kPa. Normal blood pressure (120/80) is measured in mmHg.
Frequently Asked Questions
What is standard atmospheric pressure?
Standard atmospheric pressure at sea level is 1 atm = 101,325 Pa = 1.01325 bar = 14.696 psi = 760 mmHg.
What unit is tire pressure measured in?
In the US, tire pressure is measured in PSI (pounds per square inch). In most other countries, it is measured in bar or kPa. A typical car tire is 30-35 PSI = 2.0-2.4 bar.
Why is blood pressure measured in mmHg?
Historically, blood pressure was measured using a mercury column manometer. The convention stuck, so we still express blood pressure in millimeters of mercury (e.g., 120/80 mmHg).