The cost of living on Koh Tao depends a lot on the level of comfort you are looking for and how much you intend to be enjoying the famed Koh Tao nightlife.
On a conservative budget, a monthly spend for food and accommodation will be around 25000 baht/month.
Factoring in potentially renting a scooter, enjoying other activities Koh Tao has to offer a comfortable budget would be around 35,000/month.
Other potential costs include visa extensions which can be done on Koh Tao for 1900 baht and enrolling in gym, yoga, climbing, kite surfing, SUP, trapeze, or any of the other classes available on Koh Tao.
Enjoying Koh Tao to it’s fullest it would be difficult to spend more than 50,000 baht in a month.