Enter the total inspiratory time and the total expiratory time into the I:E Ratio Calculator. The calculator will evaluate and display the I:E Ratio.

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## I:E Ratio Formula

The following formula is used to calculate the I:E Ratio.

**IE = IT / ET**

- Where IE is the I:E Ratio
- IT is the total inspiratory time
- ET is the total expiratory time

## How to Calculate I:E Ratio?

The following example problems outline how to calculate I:E Ratio.

Example Problem #1:

- First, determine the total inspiratory time.
- The total inspiratory time is given as: 2.

- Next, determine the total expiratory time.
- The total expiratory time is provided as: 4.

- Finally, calculate the I:E Ratio using the equation above:

IE = IT / ET

The values given above are inserted into the equation below and the solution is calculated:

IE = 2 / 4 = .5

Example Problem #2:** **

For this problem, the variables required are provided below:

total inspiratory time = 5

total expiratory time = 6

Test your knowledge using the equation and check your answer with the calculator above.

IE = IT / ET** = ?**