$1Wb{m}^{-2}$ is equal to

In CGS system, the magnetic field is expressed in Gauss. If a charge of 1 C moving with a velocity of $1m{s}^{-1}$ perpendicular to a uniform magnetic field experiences a force  of 1 N, then the magnitude of the field is 1 T. The SI unit of magnetic field is $Wb{m}^{-2}.Thus,$

$1T=1N{A}^{-1}{m}^{-1}=1Wb{m}^{-2}$

n CGS system,

$1tesla={10}^{4}gauss=1Wb{m}^{-2}$