Hubble's law is

v=Hr ,where v is recession velocity nowadays measured in km/s, r is distance nowadays measured in megaparsecs, and H is a constant, now called the Hubble constant.

The Hubble constant circa 2021 is thought to be either H_0 ≅ 67 (km/s)/Mpc or H_0 ≅ 73 (km/s)/Mpc. The discrepancy between these two values is the Hubble tension which may require a revision or replacement of the Λ-CDM model of the observable universe. For more on the Hubble tension, see big_bang_cosmology_limitations.html. A fiducial value for the Hubble constant 70 (km/s)/Mpc.

Note the Hubble constant
is a constant in space
(at least within the
observable universe),
**NOT** in cosmic time
and it is the rate of
expansion of the universe
per unit length or the relative rate
of expansion of the universe.