10 free pressure conversion tools. Convert between PSI, bar, kPa, atm, and mmHg instantly.
Our pressure converter tools provide 10 different ways to convert between five common pressure units: PSI (pounds per square inch), bar, kilopascal (kPa), atmospheres (atm), and millimetres of mercury (mmHg). Whether you're checking tyre pressure, working in engineering, or studying physics, these tools give you instant, accurate conversions.
Pressure conversion is essential in many fields. PSI is commonly used in the US and UK for tyre pressure and industrial applications. Bar is widely used in Europe and in meteorology. kPa is the SI unit commonly used in scientific work. Atmospheres are used in chemistry and physics, and mmHg is used in medicine for blood pressure measurements. Understanding these different units helps in engineering, science, and everyday applications.
All calculations process locally in your browser — no data is ever sent to our servers. Each tool focuses on a specific conversion pair, making it easy to get exactly what you need.
Pounds per sq inch to bar
Bar to pounds per sq inch
Pounds per sq inch to kilopascal
Kilopascal to pounds per sq inch
Bar to kilopascal
Kilopascal to bar
Pounds per sq inch to atmospheres
Atmospheres to pounds per sq inch
Bar to atmospheres
Atmospheres to bar