tank volume

Stanley Robert

Stanley Robert

AC Members
Jul 8, 2007
39
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Edmonton AB
I cant remember how to calculate volume, can anyone help ? my friend has a 48x18x20 with 150lbs of gravel and wants to know the exact amount of water with displacement is in his tank.

can anyone help with this
 
Looks like a 74.8 gallon, it would depend on the size of rock and any other stuff in the tank, including plants, heater, substrate ect, it all takes up room, a rough estimate would be 60 - 65 gallons left, but who knows....:)
 
I got this from a previous post - thought it was useful and saved it.

in inches:
Lenth x width x height = cubic inches of your tank.
take this number and multiply by 0.00433
that's how many gallons you have
like so:
48x18x24=20736in
x 0.00433=90gal
also, a gallon is 8.34 pounds
 
length x width x height (all in inches) divided by231 = US gallons

Depending on the size of the substrate, a differing amount of water will be displaced. A good thumbrule is 8-12 % less for substrate and decor.
 
awesome thanx for the formulae !! I'll put it to good use, so it seems to be approx 75 gallons but if I put the gravel into account it's more like 60 gallons then. We wanted to be exact or close to it as he bought some of the same wild scalares i did and his have ich. And we understand for wild fish we need to cut the dose of nox-ich in half for actual water volume.

any other ideas ?
 
75 minus 12 percent is 66, i was close...lol......:)
 
Sounds like my "75G tank" I always figure it's about 60 "and a bit" really. 60G for meds dosing is a convenient #, too.

Hard to figure exact amt of displacement if tank is in use...unless you have some of the same gravel "extra"...then you could figure it out with a bucket.

To figure out the 'useable area', just measure the area covered by water (to top of gravel) and use the formula above.


--Don
 
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