If you would rather do a similar thing to koi then you should consider comet goldfish. They stay a lot smaller and they are literally the same thing. You could mix it up and do 10 comets and a couple shubunkins. You can also do like 10 comets and a couple black moor. Black moor are sold for like $2 and when they get like 10" they are sold for like $500+ dollars its insane. So you could grow them big and sell them if you wanted to.
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I'm getting 23" = 1022 gallons
36" = 1533 gallons
48" = 2045 gallons


Sorry Drstrangelove but your math is wrong. Not completely wrong your idea and formula are correct you just missed one part out. You are correct in thinking it is a simple way to work out the volume by splitting the shape into two pieces a rectangle and a right angle triangle. You just enetered the wrong value for the base of the traingle. You need to subtract the width of the rectangle from the base measurement in your triangle. ie 108 - 28 so the baseline of the triangle is actually 80.
The volume is correct in my orginal post . . . .
24" deep 850G
36" deep 1275G
48" deep 1700G
here is the math . . . .
View attachment 917696
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Hopefully some mahseer too!All that work for some over sized goldfish lol!