In Bangkok / Nonthaburi, where i live my first 4 years in Thailand.
You can find what i call Thai studio room for 2.500 - 3.000 baht pr month (I start in one of them my self)
1 room, bathroom, some have only fan, others have Air Con.
Power bill, As i think the weather is getting hot every year, i say 1.000 - 3.000 baht pr month.
Water for shower, cleaning room and so on, not more then 100 baht pr month.
Thai cable tv around 300 baht pr month, only have a few English speaking channels, So you might like to have more, and therefor more money pr month.
Internet around 700 - 1.000 baht pr month. (sure small connection can do)
Mobil for calling around 200 - 300 baht pr month.
Food !!!!
Have you every being to Thailand before ?
Can you eat Thai food ?
Not sure if you can live 100% Thai style ?
But take my self, i can live for 100 baht pr day / 3.000 baht pr month.
As i eat toast bred and egg morning, and can easy eat the Thai street food (i do think it is the best food in the world)
If you need more foreigner food, this is going up up up up very fast.(The money for it)
Clean drinking water i have no idea how much pr day, As i all ways buy a water filter where i have live, Around 3.000 - 4.000 baht for that filter, and it is good for more then 1 year before need change filter.
Do you need ekstra ?
Like fruit, Juice, Cola, Beer ??
That add up quickly.
Transport every day for you study, This is up too how close you live to where you study.
But 40-60-100 baht pr day to go and home again.
Insurance, If you young and have good health, I say 20.000 - 35.000 baht pr year. ( 1.666 -
2.916 baht pr month)
Then take into account social life, you own enjoyment, new cloth, If you like to party.
What about Visa / Extension ?
Do you need to go on Visa runs every 60 - 90 days ?
Extend Visa every 60 day at Immigration.
If new Visa every 60 - 90 days, Then money for the trip, Visa to that country, Stay at hotel for 1-2 days before you new Thai Visa is ready.
It add up very quick.
I say that 10.000 baht for a single person is around 10.000 - 15.000 short, Maybe even more.
Back in 2011 i live for 23.000 - 25.000 baht pr month, But many things cost more to day.
And i didn't have insurance, So ekstra for that.
Sure i could have save more money pr month, But i did (do) like to be able to do stuff, Enjoy my self a little.
What do you think your wife is going to do here ?
Sit in the room waiting for you ?
Working ?? This is very hard to find good job for None Thai here that pay well.
Or she need money to get her own social life, be able to go to the marked, buy stuff, enjoy a coffee, Other things.
What about if a emergency happen here in Thailand for you or you wife.
Sure the Insurance pay for hospital, But many place it is up to the familie / friends to take care of the person in hospital, If not pay ekstra for that.
Food, clean them, toilet and so on.
As i know not all insurance pay for that ekstra care.
What if a emergency happen for you familie back in you home country.
Do you have the money to buy ticket home that day or next day to go home.
Do you have any money for that ?
Hope the best for you and the wife.
Kindly.