In Thailand, playing monopoly becomes real life. Every purchase feels like you're buying out a small company.
1 Dollar = 33 Baht
1 Euro = 44 Baht
Use the calculator here if you need something more accurate. Bangkok Bank also has an accurate list of the conversion rate for all currencies with the Baht (click here).
Oh, and just like 7/11s are everywhere, so are ATMs. Seriously, everywhere. No worries my friend.