Who is good at math? I want to figure out how many liters by volume my "tub" core mould will hold? Then I can figure out 60-70% of that is how much perlite I need, in liters, which is how the perlite is measured and bought, by the liter , by volume.

My core is 16" x 32" x 20"

That's 10,240 cubic inches?

My burn chamber is 20" x 6" x 6" = 720 cubic inches

My

feed chamber is 6x6x9" = 324 cubic inches

My riser is (Pi) 3.14 x (Radius) 6" x (length) 14"= 263.76 cubic inches?

My core mix volume does not include the feed or burn chamber or riser, so I will subtract them from the total tub volume 720+324+263.7= 1307.7

How many liters fits into 10240 -1307.7 = 8932.3 cubic inches?

I feel confident that my math is good, EXCEPT for the riser, I'm sure that my math there is wrong.

Any input or help from any math whiz? I'm trying to figure out how many liters of perlite makes 65% of my core volume...

1 square =1" on my diagrams

I will mark this

thread as RESOLVED after I get some help , thanks in advance, anyone with good math or casting

experience