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Rapid Shallow Breathing Index (RSBI) Calculator

Enter the respiratory rate and tidal volume to get the RSBI.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

The Rapid Shallow Breathing Index (RSBI), introduced by Yang and Tobin in a landmark 1991 study, is calculated as respiratory rate (breaths/min) ÷ tidal volume (in litres) during a brief trial of unassisted breathing. An RSBI under 105 is the widely used threshold suggesting a patient is likely to tolerate extubation, while higher values flag a fast, shallow breathing pattern associated with weaning failure.

Intensivists and respiratory therapists calculate RSBI at the bedside as one of the most reliable, simplest predictors available before attempting to wean a patient off mechanical ventilation — it doesn't replace clinical judgment, but it's cited in ventilator-weaning protocols worldwide as a fast, objective data point alongside oxygenation and hemodynamic status.

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