determining size of tank

Nov 19, 2008
702
0
0
Des Moines, Iowa
#6
so you use divide by 231 for every size then, correct or no? the reason im asking is i found what may be a 40 or 30 online but they dont know size of gallons so when they finally tell me size measurements i wanted to do the math to see if its worth $50 for the tank only. i dont think it comes with light bar or lid and no filter