The Calorie‑to‑Megawatt‑Hour (Cal → MWh) conversion translates the heat energy measured in calories—commonly used in nutrition and thermodynamics—into the large‑scale electrical energy unit of megawatt hours, the standard metric for power plant output and grid consumption. One calorie equals 4.184 joules, and one megawatt hour equals 3.6 × 10⁹ joules, so 1 Cal ≈ 1.16 × 10⁻⁶ MWh. This conversion is essential for scientists calculating the energy content of fuels, for engineers designing renewable‑energy systems, and for policymakers comparing food‑energy efficiency with industrial power use. It also helps educators illustrate the relationship between everyday energy concepts and the massive scales of electricity generation, making the abstract notion of “megawatt hours” tangible through familiar calorie values.