The NRG Calculator is a predictive energy calculator for computing the energy needs of patients in order to support the decisions of dietitians in clinical settings.

It supports energy calculations based on a multitude of equations published in literature.

Its aim is to cover the equations that are commonly used in Canada.


  • 10 equations for calculating energy
  • dynamic user interface
  • non-linear age input with increased precision (e.g., weeks, months) at younger ages
  • body mass index (BMI), ideal body weight (IBW), and adjusted body weight (ABW) calculations
  • energy results adjustments capability