Pressure Converter

Convert between all pressure units. Select a conversion from the table below.

Pascal

The pascal (Pa) is the SI unit of pressure, equal to one newton per square metre. It is used in physics, engineering, and meteorology. Because it is a very small unit, kilopascals and megapascals are more common in practice.

1 Pa to kPa 1 Pa to bar 1 Pa to atm 1 Pa to psi 1 Pa to mmHg 1 Pa to Torr

Kilopascal

The kilopascal (kPa) equals 1,000 pascals. It is commonly used for tyre pressure, atmospheric pressure, and industrial applications. Standard atmospheric pressure is approximately 101.325 kPa.

1 kPa to Pa 1 kPa to bar 1 kPa to atm 1 kPa to psi 1 kPa to mmHg 1 kPa to Torr

Bar

The bar equals 100,000 pascals or approximately 0.987 atmospheres. It is widely used in meteorology for weather maps and in industry for process pressure measurements.

1 bar to Pa 1 bar to kPa 1 bar to atm 1 bar to psi 1 bar to mmHg 1 bar to Torr

Atmosphere

The atmosphere (atm) equals 101,325 pascals. It represents the average air pressure at sea level and is used as a reference point in chemistry, diving, and altitude calculations.

1 atm to Pa 1 atm to kPa 1 atm to bar 1 atm to psi 1 atm to mmHg 1 atm to Torr

Pound per square inch

Pounds per square inch (psi) is widely used in the United States and United Kingdom for tyre pressure, hydraulic systems, compressed gas, and material strength specifications.

1 psi to Pa 1 psi to kPa 1 psi to bar 1 psi to atm 1 psi to mmHg 1 psi to Torr

Millimetre of mercury

Millimetres of mercury (mmHg) is the standard unit for blood pressure measurements in medicine. Normal blood pressure is approximately 120/80 mmHg. It is also used in vacuum measurement and barometry.

1 mmHg to Pa 1 mmHg to kPa 1 mmHg to bar 1 mmHg to atm 1 mmHg to psi 1 mmHg to Torr

Torr

The torr is a pressure unit nearly identical to mmHg, named after Evangelista Torricelli. It is primarily used in vacuum science, physics laboratories, and low-pressure applications.

1 Torr to Pa 1 Torr to kPa 1 Torr to bar 1 Torr to atm 1 Torr to psi 1 Torr to mmHg

What Is Pressure?

Pressure is force applied perpendicular to a surface per unit area. It is a fundamental quantity in physics, meteorology, medicine, and engineering. Pressure determines weather patterns, blood flow, tyre performance, and industrial processes.

SI Pressure Units

The pascal (Pa) is the SI unit of pressure, equal to one newton per square metre. It is very small, so the kilopascal (kPa) (1,000 Pa) is more practical for everyday use. The bar equals 100,000 Pa and is used in meteorology and industry. The atmosphere (atm) equals 101,325 Pa and represents standard sea-level air pressure.

Other Pressure Units

Pounds per square inch (psi) is widely used in the US and UK for tyre pressure, hydraulics, and compressed gas. Millimetres of mercury (mmHg) is the standard for blood pressure readings in medicine. Torr is nearly identical to mmHg and is used in vacuum science and physics.