need to know how many gallons a few tanks are???

[tunasam13]

ok i want to know for sure what size the tanks are i have i have 3 i need to know what size they are as i didnt buy them new..

1st 48Lx21Hx12W

2nd 48Lx18Hx12W

3rd 40Lx19Hx10W

 

[rolo65]

 

[elfloyd]

(L x W x H) / 231

 

[tunasam13]

thank you sir!