This paper determines the field and current distribution in a high‐field, superconducting material in sheet form, where the applied magnetic field is parallel to the sheet. The distributions are obtained from a critical state equation and Maxwell's equations, and determined for the two cases of absence or presence of a net transport current in the material.The field distributions are used to determine the magnetization of the material as a function of applied magnetic field, with the short‐sample current‐carrying capacity as a parameter. The zero transport current magnetization curves show good agreement in general shape with those experimentally observed. The analysis indicates a reduction in magnetization with increasing transport current.