It is always a good idea to have an ATM (Automatic Teller Machine) card handy. You never know when you need that extra cash. Now, even if you have a credit card, VISA/Mastercard, it is still much better to withdraw from your bank account, as credit cards not only charge you the transaction fee, there will also be some additional interest charge and a cash advance fee!

Check with your bank on their charges.

In Bangkok, there two systems that seem to exist for most ATM tellers. They are the PLUS system (which is associated with VISA) and Cirrus (which is associated with MasterCard). When you are trying to withdraw using your ATM card, make sure the reverse of your ATM card has either one of the two logos shown below and also that the ATM teller has the matching logos.

PLUS System

Cirrus System

If you are a Mastercard holder, their website has a Mastercard ATM locator for Bangkok (and other locations as well).

Actually this is probably the easiests thing in Bangkok. These days, you can liteally find an ATM machine anywhere within a radius of 100 m in any direction. There is hardly any shopping mall without an ATM. Every BTS or MRT station would have ATM machines from several banks. Almost any soi along Sukhumvit road would have an ATM machine. Happy shopping!