How much is 1 dollar in Binance?

Excuse me, I'm a bit confused about the conversion rates on Binance. Could you please clarify for me, what exactly is the current exchange rate for 1 dollar in Binance? I'm trying to make a purchase but I want to make sure I have the right amount of cryptocurrency to do so. Is there a specific way I should be calculating this, or is there a tool I can use to get the most up-to-date information? Thank you for your help!