All Pressure Units

How to Convert Pressure Units?

Pressure conversion enables you to translate force per unit area measurements between different systems. Pressure is defined as force applied perpendicular to a surface divided by the area over which that force acts. Different industries and regions use various pressure units, making conversion essential for international collaboration and technical work.

The key conversion factors are:
- 1 bar = 100,000 Pa = 14.504 psi
- 1 atm = 101,325 Pa = 1.01325 bar = 14.696 psi
- 1 psi = 6,894.76 Pa = 0.0689 bar
- 1 mmHg = 133.322 Pa = 1 Torr

Units

Pascal (Pa)

Pascal is the SI unit of pressure, named after French mathematician Blaise Pascal. One pascal equals one newton per square meter (N/m2). While pascals are the scientific standard, they represent very small pressures, so kilopascals (kPa) or megapascals (MPa) are often used in engineering and industrial applications.

Bar

Bar is a metric unit of pressure equal to 100,000 pascals. It is widely used in meteorology, oceanography, and industrial applications, particularly in Europe. One bar is approximately equal to atmospheric pressure at sea level (0.987 atm). The millibar (mbar) is commonly used for weather forecasting and barometric pressure readings.

PSI (Pounds per Square Inch)

PSI is the standard pressure unit in the United States and is widely used in automotive, aerospace, and industrial applications. It measures the force in pounds applied to one square inch of surface area. Tire pressures, hydraulic systems, and compressed gas cylinders commonly use psi measurements.

Atmosphere (atm)

Standard atmosphere is a unit of pressure defined as 101,325 Pa. It represents the average atmospheric pressure at sea level on Earth. This unit is commonly used in chemistry, physics, and diving applications to describe ambient pressure conditions. One atm equals approximately 14.7 psi or 1.013 bar.

mmHg (Millimeters of Mercury)

Millimeters of mercury is a pressure unit based on the height of a mercury column in a manometer. It is primarily used in medicine for blood pressure measurements (sphygmomanometer readings) and in meteorology for barometric pressure. Normal blood pressure is typically expressed as 120/80 mmHg. One mmHg equals exactly one Torr.

Common Pressure Conversions