Community Tip - Visit the PTCooler (the community lounge) to get to know your fellow community members and check out some of Dale's Friday Humor posts! X
"Tools", "worksheet Options", "Dimensions" tab, uncheck "Display dimensions".
You can type the units you desire:
And Mathcad will adjust the value to match. note that psi is pounds force per square inch, the unit lb is pounds mass, not pounds force (which is "lbf")