  We show that the saturation of resistive tearing modes in a cylindrical
tokamak, as well as the corresponding island width, can be directly calculated
with an MHD equilibrium code without solving the dynamics and without
considering resistivity. The results are compared to initial value resistive
MHD simulations and to an analytical nonlinear theory. For small enough
islands, the agreement is remarkable. For sufficiently large islands, the
equilibrium calculations, which assume a flat current profile inside the
island, overestimate the saturation amplitude. On the other hand, excellent
agreement between nonlinear resistive MHD simulations and nonlinear theory is
observed for all the considered tearing unstable equilibria.
