Enter the manufactured date and the expiration date into the Shelf Life Calculator. The calculator will evaluate the Shelf Life.

## Shelf Life Formula

The following two example problems outline the steps and information needed to calculate the Shelf Life.

SL = ED - MD

Variables:

- SL is the Shelf Life (dats)
- MD is the manufactured date
- ED is the expiration date

To calculate Shelf Life, subtract the days between the expiration date and the date of manufacture.

## How to Calculate Shelf Life?

The following steps outline how to calculate the Shelf Life.

- First, determine the manufactured date.
- Next, determine the expiration date.
- Next, gather the formula from above = SL = ED – MD.
- Finally, calculate the Shelf Life.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

manufactured date = 9/20/22

expiration date = 9/20/24

SL = ED – MD** **= ?