  We derive a universal formula for the one-loop renormalization of the
effective K\"ahler potential that applies to general supersymmetric effective
field theories of chiral multiplets, with arbitrary interactions respecting N=1
supersymmetry in four dimensions. The resulting expression depends only on the
tree-level mass spectrum and the form of the regulator. This formula simplifies
and generalizes existing results in the literature. We include two examples to
illustrate its use.
