Exchange THB for USD or vice versa; where to get the best rates and avoid tourist rip-offs.
Available 24/7 but rates are worst; only use if you have no other option.
Best rates, withdraw THB directly (no conversion fee if your bank is reasonable); use Bangkok Bank or Krungsri ATMs.
Mid-range rates; widespread (malls, Sukhumvit); faster than banks but not as good rates as ATM.
Convenient but poor rates; only use in emergency.
Jewelry/souvenir shops offering exchange; rates are terrible; avoid.
Get Thai baht from ATM (withdraw in chunks, avoid fees); use that for daily spending; only exchange back home if you have excess.
SuperRich (orange and green branches are separate companies) consistently offers some of the best money-changer rates in Bangkok — branches are common in malls and along Sukhumvit.
When paying by card or withdrawing from an ATM, always choose to be charged in Thai baht rather than your home currency — the "convenience" conversion rate offered is reliably worse.
Enough for a day or two of street food, taxis, and small purchases is sensible — most mid-range and upscale spots accept cards, but street stalls and markets are cash-only.