The S I unit of pressure is the pascal. The units of pressure are defined in the same way as those for stress - force/unit area. To change any of these other units of pressure (or stress) into their equivalent values in pascals use the operation and conversion factor given. Those marked with * are exact. Other values are given to an appropriate degree of accuracy. Measures based on water assume a density of 1 kg/litre - a value which is rarely matched in the real world, though the error is small.
atmospheres x 101 325 * bars x 100 000 * centimeters of mercury x 1333.22 centimeters of water x 98.066 5 * feet of water x 2989.066 92 * hectopascals [hPa] x 100 * inches of water x 249.088 91 * inches of mercury x 3386.388 kg-force/sq.centimeter x 98 066.5 * kg-force/sq.meter x 9.806 65 * kilonewton/sq.meter x 1000 * kilopascal [kPa] x 1000 * kips/sq.inch x 6 894 760 meganewtons/sq.meter x 1 000 000 * meters of water x 9806.65 * millibars x 100 * pascals [Pa] 1 millimeters of mercury x 133.322 millimeters of water x 9.806 65 * newtons/sq.centimeter x 10 000 newtons/sq.meter 1 newtons/sq.millimeter x 1 000 000 * pounds-force/sq.foot x 47.880 pounds-force/sq.inch x 6894.757 poundals/sq.foot x 1.448 16 tons(UK)-force/sq.foot x 107 252 tons(UK)-force/sq.inch x 15 444 256 tons(US)-force/sq.foot x 95 760 tons(US)-force/sq.inch x 13 789 500 tonnes-force/sq.cm x 98 066 500 * tonnes-force/sq.meter x 9806.65 * |