Pressure Conversions
5 units · 20 converters
Convert between pascals, bar, atmospheres, psi and millimeters of mercury. Exact factors for weather, diving, tires and engineering.
Pascal(Pa)
The pascal is the SI unit of pressure, one newton per square meter. Because it is small, practical values are often quoted in kilopascals, bar or atmospheres.
Bar(bar)
A bar equals exactly 100,000 pascals, close to average atmospheric pressure at sea level. It is the standard unit for tire pressure, dive tanks and espresso machines in metric countries.
Atmosphere(atm)
One standard atmosphere is defined as exactly 101,325 pascals, the reference average pressure of Earth's atmosphere at sea level. It anchors chemistry and gas-law calculations.
PSI(psi)
Pounds per square inch (psi) is the US customary pressure unit, one pound-force applied to one square inch. Tire gauges, compressed air and hydraulics in the US are measured in psi.
Millimeter of Mercury(mmHg)
A millimeter of mercury is the pressure exerted by a one-millimeter column of mercury, about 133.32 pascals. Blood pressure and vacuum measurements are still quoted in mmHg.