PHECT (Pulsar Halo Emission Computation Tool) efficiently computes pulsar halo emission. It yields γ-ray and X-ray surface brightness and energy spectra, as well as the energy and spatial distributions of parent electrons and positrons responsible for pulsar halo generation. Written in C, the tool incorporates multiple theoretical and phenomenological models, facilitating direct comparison between model predictions and experimental measurements. PHECT's core consists of a dynamic library, a parameter configuration file, and an interface program. Users can perform essential computations solely by modifying the parameter file, ensuring straightforward operation.