Estimation of FiO2 calculation during the use of nasal cannula in a child is
21% + (Nasal Cannula flow (L/min) X 1) 21% + (Nasal Cannula flow (L/min) X 2) 21% + (Nasal Cannula flow (L/min) X 3) 21% + (Nasal Cannula flow (L/min) X 4)