Conversion Calculator for Units of PRESSURE & STRESS Type in size select units . . . pascals millibars bars atmospheres inches of water inches of mercury feet of water pounds/sq.inch pounds/sq.foot tons(UK)/sq.foot tons(US)/sq.foot pascals kilopascals megapascals mm of water mm of mercury kg/sq.cm tonnes/sq.m newtons/sq.cm newtons/sq.m kilonewtons/sq.m then press Else Values are shown to . . . 3 4 5 6 7 8 9 significant figures. millibars [= hPa] pascals [Pa] bars kilopascals [kPa] atmospheres**** megapascals [MPa] inches of water *mm of water inches of mercury **mm of mercury feet of water kg / cm2 pound / inch2 [psi] ***tonnes / m2 pounds / foot2 newtons / cm2 tons(UK) / foot2 newtons / m2 tons(US) / foot 2 kilonewtons / m2 * 'mm of water' are same value as kg/m2 ** 'mm of mercury' are also known as 'torrs' *** tonnes/m2 are same value as 'metres of water' **** The 'atmosphere' is absolute. The 'pound', 'kg', 'ton', etc are all units of force NOT mass. Unit shown in red is the SI 'preferred' unit.