How do you calculate network cost?

Excuse me, could you please elaborate on how exactly one calculates the network cost in the realm of cryptocurrency? Is it a straightforward process, or does it involve intricate algorithms and factors that need to be taken into consideration? Additionally, do different cryptocurrencies employ different methodologies for calculating their respective network costs, and if so, what are some of the key differences? I'm particularly interested in understanding the nuances and complexities that underlie this process.