The Hiroshima bomb was 20 kilotons. That compares to the 1000 kiloton, or 1 megaton, the mapping program uses.
An American 'back pack nuke' had a variable yield of a 0.1 kilotons to 5 kilotons. It was actually transported as three seperate man carried load and was assembled on-site. (We used shielding on the nuclear material.)