How many Satoshi is $1?

Could you please clarify for me how many Satoshis constitute the equivalent of one dollar? I'm trying to get a better understanding of the conversion rate between fiat currency and the smallest unit of Bitcoin. I'm aware that the exchange rate fluctuates, but I'm interested in a general sense of the conversion. Could you possibly provide me with an approximate figure or explain how I can calculate it myself? It would be greatly appreciated if you could help me navigate this aspect of cryptocurrency.