I:E Ratio Calculator

Calculates inspiratory-to-expiratory ratio from timing, percent, frequency, or volume/flow settings.

Inputs

Color mode links each input to the matching equation term and solving arithmetic.

Equation and Work

Equation:
Solving steps:
I:E ratio
—
ratio
I time
—
sec
E time
—
sec

Clinical Significance

I:E ratio compares inspiratory time to expiratory time; the page supports several standard bedside ways to calculate it.

Used to evaluate and adjust ventilator timing, expiratory time, and inverse-ratio patterns.

Calculator output should be interpreted with the patient’s condition, measurement quality, and local clinical policy.

References (APA 7th Edition)

  1. Chang, D. W. (2020). Respiratory Care Calculations (Revised 4th ed.). Jones & Bartlett Learning. Formula content adapted from the uploaded text/reference packet.