Inspired O2 tension (PIO2) is expressed in mmHg (torr).
PIO2 is also referred to as Partial Pressure of Inspired Oxygen. PIO2 decreases as altitude increases (above sea level).

*FIO2 can be entered as a % or fraction.
Convert from FIO2 in L/min to %, following the equation:
FIO2 L/min = (FIO2 % - 21)/3
(1L/min = 24%, 2L/min = 27%, 3L/min = 30%, 4L/min = 33%, 5L/min = 36%, 6L/min = 39%)