How Many Gallons Is My Tank? And Will It Be Good For My Betta?

Looks like 2.5. i wouldn't put a Betta in there because it seems too tall

It looks like two to three but I’d need more pictures. If you want, get at least three gallons of water from the store (that only cost a couple of dollars and you can get it distilled so you can use it as your fishes water) and add it to the tank so that you know.

3 I think. I’m probably wrong lol

There are two ways you accurately can find the volume of a tank:

-Get a container you know for sure is 1 gallon and see how many it takes to fill it up

-Take the measurements of your tank and find a calculator online(there are several for round tanks like that)

Its impossible to say the size specifically with nothing but a photo, but it looks rather small and if i had to guess its under 5 gallons. I wouldn't put a betta in there, personally, both due to the size and the fact that its an extremely small footprint. Bettas do best in longer tanks rather then tall and when it comes to tanks 5 gallons and under, taller ones just dont provide enough horizontal space.