A volume or fluid level sensing system as taught by the present invention comprises a flexible bladder, a solenoidal coil, a means for volume or fluid level measurement, and a user interface. Means for volume or fluid level measurement are preferentially means for inductance measurement which may be selected from the set including timing inductive measurement means, AC voltage divider inductive measurement means, resonance inductive measurement means. A user interface may be selected from the set including a digital display, a data interface, a voltage level display device, or a current level display device. The solenoidal coil may be embedded in the flexible bladder or in a flexible sock encompassing the flexible bladder. In addition, a bladder volume or fluid level indicating method as taught by the present invention comprises the steps of inductance measurement, volume or fluid level inference, and volume or fluid level reporting.