# how to calculate safety stock from output of ARIMA model?

I have built an arima model using monthly sales as input suppose the output from ARIMA model is :

How do we calculate safety stock for different lead times lead times (in days)??

- Product    Pt. forecast     Lo 95         Hi 95         Lead Time

- A           25.80          1.51           50.10          15

- B            5.83         -5.58           17.24          30

- C            2.88         -0.78            2.56          56

- D            2.88         -0.78            2.56          91


How do we calculate safety stock considering lead time which is in days??