PICU Calculator - free body weight-based calculator for paediatric intensive care, including drug dosages and equipment sizes. Instructions for use Age range: 0-18 years (You can select the unit for age: years, months, or days) Body weight range: 0-150kg The information provided is self-explanatory. If you enter the age in days, the app will assume the baby is a neonate or a very small infant and will take this into account in certain calculations, e.g. ETT size. Additional functions: A b