What is the best effective method to calculate your safety stock levels, Do you recalculate safety stock levels on a regular basis to up to date?

The minimum stock required  in fact should be actually the maximum stock level for orders serving,

Thus, Balancing to be in place by the this question what is the maximum stock that i have to keep in order to be ready for any & all orders that i will to receive during such period in the term that maximum should not be led to excess quantity which led to freeze liquid assets and lost opportunity.