  The Land\'e or $g$-factors of charge carriers are decisive for the
spin-dependent phenomena in solids and provide also information about the
underlying electronic band structure. We present a comprehensive set of
experimental data for values and anisotropies of the electron and hole Land\'e
factors in hybrid organic-inorganic (MAPbI$_3$, MAPb(Br$_{0.5}$Cl$_{0.5}$)$_3$,
MAPb(Br$_{0.05}$Cl$_{0.95}$)$_3$, FAPbBr$_3$,
FA$_{0.9}$Cs$_{0.1}$PbI$_{2.8}$Br$_{0.2}$) and all-inorganic (CsPbBr$_3$) lead
halide perovskites, determined by pump-probe Kerr rotation and spin-flip Raman
scattering in magnetic fields up to 10~T at cryogenic temperatures. Further, we
use first-principles DFT calculations in combination with tight-binding and
$\mathbf k \cdot \mathbf p$ approaches to calculate microscopically the Land\'e
factors. The results demonstrate their universal dependence on the band gap
energy across the different perovskite material classes, which can be
summarized in a universal semi-phenomenological expression, in good agreement
with experiment.
