An educational total parenteral nutrition calculator for pharmacists, dietitians and physicians formulating an adult starter TPN. Enter weight, height, sex, age, recent weight loss, stress factor and ICU status, then choose a dosing weight strategy, caloric and protein goals, administration route and lipid product. The calculator applies ASPEN 2020–2025 guidance, including the 2025 ICU consensus for week-one trophic dosing, refeeding risk assessment and lipid maximums by emulsion type. Output is a complete starter formulation with macronutrients, fluids and electrolytes for review before ordering. For education only; every order must be verified by the responsible clinician.