U6 is: Total unemployed, plus all persons marginally attached to the labor force, plus total employed part time for economic reasons, as a percent of the civilian labor force plus all persons marginally attached to the labor force
Also worth noting that U-3 is an international definition of unemployment. If different countries use different definitions, then comparing rates among countries would be pretty much meaningless.
dsr_ followed the column down a bit off and got the Feb 2017 seasonally adjusted number (they are one column apart) - they should really separate those better
https://www.bls.gov/news.release/empsit.t15.htm
U6 is: Total unemployed, plus all persons marginally attached to the labor force, plus total employed part time for economic reasons, as a percent of the civilian labor force plus all persons marginally attached to the labor force
The national U6 right now is 9.2 (unadjusted).