size of my tank

[jack-a-be]

I was wondering if someone can tell me if my tank is 75 or 125 gal.
the measurements are
48in in length
18in in width
21in deep

 

[ifirefight]

78.54 gallons LxWxH divided by 231 = gallons.

 

[bigpapa]

http://www.aquaticcommunity.com/conv...calculator.php