HI Calculator HI Calculator This calculator helps determine the Hazard Index (HI) based on different input parameters. Dietary Intake 1 (mg/kg/day): Reference Dose 1 (RfD) (mg/kg/day): Dietary Intake 2 (mg/kg/day): Reference Dose 2 (RfD) (mg/kg/day): Dietary Intake 3 (mg/kg/day): Reference Dose 3 (RfD) (mg/kg/day): Calculate HI