Every magnet has two poles (dipole) so the strength of the field is dipole field strength.
Fact sheet: units used are in: Mercury gauss-Rh^3, (Rh being a Mercurial radii). Earth: gauss-Re^3 (Re being the Earth's radius), you get the picture: Jupiter: Rj, Saturn: Rs, Uranus: Ru, Neptune: Rn.