Pressure Converter

Pressure is the measure of force applied perpendicular to a surface, divided by the area over which that force is distributed. In physics and engineering, understanding pressure is essential for designing everything from aircraft cabins to hydraulic brakes. The SI unit for pressure is the pascal (Pa), defined as one newton per square meter, as standardized by the National Institute of Standards and Technology (NIST).

The concept of pressure was revolutionized by Blaise Pascal in the 17th century, who discovered that pressure in a fluid at rest is transmitted equally in all directions. This principle, known as Pascal's law, is the foundation of modern hydraulics. Evangelista Torricelli, an Italian physicist, invented the barometer in 1643 and demonstrated that air has weight, leading to the unit "torr" being named after him. You can read more about the history and physics of pressure on Wikipedia.

Here is a quick reference table showing equivalent values across the most common pressure units:

For energy-related calculations that involve pressure and volume, try our Energy Converter or Force Converter.

Pressure measurements are critical across dozens of industries. In automotive maintenance, tire pressure is typically recommended between 30–35 psi (about 2.1–2.4 bar). Scuba divers monitor water pressure, which increases by approximately 1 atm for every 10 meters of depth. In medicine, blood pressure is measured in millimeters of mercury (mmHg), with normal values around 120/80 mmHg.

Industrial applications include monitoring steam pressure in power plants, controlling pneumatic tools in manufacturing, and calibrating vacuum chambers for semiconductor fabrication. Meteorologists track atmospheric pressure in hectopascals (hPa) to predict weather changes, where a rapid drop often signals an approaching storm system.