Abstract: Methods, computer-readable media, and breathing equipment training devices for simulated resource depletion calculation. The breathing equipment training device includes a shell including an opening, a sensor connected to the shell, and a controller connected to the shell and operably connected to the sensor. The controller is configured to calculate, based on inputs from the sensor, a flowrate of air entering the breathing equipment training device through the opening of the shell and calculate an amount of depletion of a simulated resource for a duration of time based on the calculated flowrate of air entering the opening of the shell. The controller is configured to identify a current status of the simulated resource based on the calculated resource depletion amount and a prior status of the simulated resource identified prior to the duration of time and generate a feedback signal indicating the current status of the simulated resource.