Safety Stock calculator

With this calculator you can compute safety stock with the formula A_s = KSL^0,5, where

• A_s = Safety stock
• K = Normal cumulative distribution function (safety factor)
• S = Standard deviation (example above)
• L = Lead time of purchasing

If you don’t know your standard deviation, choose Poisson distributed deviation and the form will calculate it with the formula below. More about the safety stock and Poisson distributed demand.

Formula for standard deviation

• S = Standard deviation
• X_a = Mean demand of the day/week/month

K factor in different service levels:

K factor in different service levels