Motivated by the recent work of Gimperlein and Goffeng on Calder\'on's
commutator on compact Heisenberg type manifolds and the related weak Schatten
class estimates, we establish the characterisation of Lp boundedness for
Calderon's commutator on stratified Lie groups. We further study the related
weak Schatten class estimates on two step stratified Lie groups, which include
the Heisenberg groups