From the perspective of $τ$-tilting theory, we study Frobenius--Perron dimensions of finite-dimensional algebras. First, we evaluate the Frobenius--Perron dimensions of $τ$-tilting finite algebras by a combinatorial method in $τ$-tilting theory. Secondly, we give the upper bound for the Frobenius--Perron dimension for $τ$-tilting finite algebras of tame representation type. Thirdly, we determine the Frobenius--Perron dimensions of Nakayama algebras and generalized preprojective algebras of Dynkin type in the sense of Geiss--Leclerc--Schröer.