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A universal exponential factor, $\gamma_{c}=\pi/2$, is disclosed for thedimensional crossover of few-layer graphene (FLG) from two-dimensional grapheneto three-dimensional graphite. $\gamma_{c}$ is found by analyzing availableexperimental data on different properties of FLG with varying thickness. Atheoretical study on the phonon spectrum of the vertical acoustic mode in FLGis carried out to further check this exponential factor $\gamma_{c}$.Interestingly, the same exponential factor appears in the dimensional crossoverof the phonon mode. It turns out that the exponential factor $\gamma_{c}$ isrelated to the homogeneous Helmholtz-like molal equation in the mass transferwith a first order chemical reaction. The finding should provide valuableinformation for experimentalists and theorists in the future investigation onthickness dependent properties of FLG.

A universal exponential factor in the dimensional crossover from graphene to graphite