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The Land\'e or $g$-factors of charge carriers are decisive for thespin-dependent phenomena in solids and provide also information about theunderlying electronic band structure. We present a comprehensive set ofexperimental data for values and anisotropies of the electron and hole Land\'efactors 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$_3$) leadhalide perovskites, determined by pump-probe Kerr rotation and spin-flip Ramanscattering in magnetic fields up to 10~T at cryogenic temperatures. Further, weuse first-principles DFT calculations in combination with tight-binding and$\mathbf k \cdot \mathbf p$ approaches to calculate microscopically the Land\'efactors. The results demonstrate their universal dependence on the band gapenergy across the different perovskite material classes, which can besummarized in a universal semi-phenomenological expression, in good agreementwith experiment.

The Land\'e factors of electrons and holes in lead halide perovskites: universal dependence on the band gap