How many visa exempt entries can I use at land borders in Thailand within a calendar year?

Your first visa exempt do not count when you first enter the country. In layman's term, you can do 2 border runs in a calendar year.

1. Come in with a visa exempt via air or even land border (usually 30 days depending on country)

2. Extend at immigration (30 days)

3. Do a land border run (30 days)

4. Extend at immigration (30 days)

5. Do a land border run (30 days)

6. Extend at immigration (30 days)

7. Time to leave. (You could come in by air again)

Of course, all this if the immigration officers you meet go easy on your ass.

2

Im a Sri Lankan on a tour in thailand, I have two months visa, Is it possible for me to extend the visa for another month or two ?

Interesting you use the term visa waiver. It’s specifically implies you are from a select group of countries. Without knowing your passport country it’s impossible to tell whether you’re using the right terminology or not.

@Jimmy ********

2 times as long as you look ok to the immi officer.

"Visa Waiver" means bilateral agreement and is only available to a much smaller list of countries. There is no limit to how many times you can enter using visa waiver.

Visa exempt is much more common. This gives you 30 days when you stamp into Thailand and is available to a large list of countries. This is only possible 2 times per year at a land border.

You can get 2 visa exemption entries per calendar year using a land border.