How to calculate packing cost?

Excuse me, could you please elaborate on how one might go about calculating the cost of packing? Are there specific factors that need to be taken into consideration, such as the size and weight of the items being packed, or the type of packaging materials being used? Is there a standard formula or methodology that is commonly employed in this process? I'm interested in understanding the intricacies of this calculation and how it might impact the overall cost of shipping and logistics. Thank you for your time and consideration.