Labor Force Participation Rate = 62.6% (May 2016, bureau of labor statistics)
US Population = 324,000,000
People working or looking for job = 0.626x324,000,000 = 202,824,000
Employed usually working full time = 123,135,000 (May 2016)
Employed usually work part time = 27,936,000 (May 2016)
Total Employed full or part time = 123,135,000 + 27,936,000 = 151,071,000
Rate of employment = 74.5%
Rate of unemployment = 25.5%
These are my quick and dirty calcs based on BLS data. Here's a website that must do the calcs similar to the way I did it, though I did not analyze their calcs to see how we are the same or different.
http://www.shadowstats.com/alternate_data/unemployment-charts But they come up with 23% unemployment rate.