Pressure Converter
Convert between 22 different pressure units instantly.
Convert Pascal to Kilopascal
Available Pressure Units (22)
Popular Pressure Conversions
About Pressure Conversion
Pressure is defined as force applied perpendicular to a surface per unit area. It is a critical measurement in meteorology, engineering, medicine, diving, automotive maintenance, and industrial processes. The diversity of pressure units — pascals, bars, atmospheres, PSI, torr, millimeters of mercury — reflects the many fields where pressure measurement is essential. Each industry has adopted its preferred unit, making conversion between them a frequent necessity for professionals working across disciplines or international boundaries.
Understanding Pressure Units
The SI unit of pressure is the pascal (Pa), defined as one newton per square meter. However, the pascal is very small for most practical applications, so kilopascals (kPa), megapascals (MPa), and bars are commonly used instead. One standard atmosphere (atm) equals 101,325 Pa or 1.01325 bar. In the US, pounds per square inch (PSI) dominates automotive and industrial applications. Medical blood pressure is measured in millimeters of mercury (mmHg), also called torr. Meteorologists use hectopascals (hPa) or millibars (mbar), which are numerically identical. This proliferation of units makes a reliable pressure converter indispensable.
Pressure in Everyday Applications
Tire pressure is one of the most common everyday pressure measurements. US tire gauges read in PSI (typical car tires: 30-35 PSI), while European gauges may read in bar (2.0-2.4 bar) or kPa (200-240 kPa). Blood pressure readings (e.g., 120/80 mmHg) use millimeters of mercury by medical convention. Weather reports include atmospheric pressure in hectopascals or inches of mercury (inHg) — standard sea-level pressure is 1013.25 hPa or 29.92 inHg. Scuba divers track ambient pressure in atmospheres or bar, with pressure increasing by approximately 1 atm for every 10 meters of depth.
Industrial and Engineering Pressure
Industrial processes often operate at pressures far above or below atmospheric. Steam boilers may operate at 10-100 bar (145-1,450 PSI). Hydraulic systems in heavy machinery use pressures of 200-700 bar (2,900-10,150 PSI). Vacuum systems are measured in torr or millibar, with high vacuum defined as below 10⁻³ torr. The oil and gas industry measures wellhead pressure in PSI, often thousands of PSI. Semiconductor manufacturing requires ultra-high vacuum (below 10⁻⁹ torr). Understanding and converting between these pressure ranges is essential for safety and equipment specification.
Gauge vs Absolute Pressure
An important distinction in pressure measurement is between gauge pressure and absolute pressure. Gauge pressure (psig, barg) measures pressure relative to atmospheric pressure — a tire gauge reading of 32 PSI means 32 PSI above atmospheric. Absolute pressure (psia, bara) measures relative to perfect vacuum — the same tire has an absolute pressure of approximately 46.7 psia (32 + 14.7 atmospheric). This distinction is critical in engineering calculations, thermodynamics, and gas law applications. Our converter works with absolute pressure values, which is the standard for unit conversion.