New tank size! Need help!

[Markusroberts]

Basically I'm buying a tank of a friends brother as he's moving to a different country how ever I'm not to sure how much water it can hold and I don't want to asked to many questions because I'm asking my friend and their having to text their brother each time all I know is its a just over 3ft and it's got an external filter, this is the tank, I don't suppose anyone has any idea how many letters it is or gallons

Thanks you for your help

 

[jtez]

I have a 3ft tank that holds 37gal (140 litres). It has dimensions 3ft long x 14" wide x 18" tall

You won't know exactly how much its volume is unless you know the other dimensions (height, width).

But there's a whole bunch of sites that list standard sizes:
http://www.cichlid-forum.com/articles/aquarium_sizes.php
http://www.aquariumdimensions.com/