Google "Aquarium Calculator" and use one of the dozens of sites that comes up?
No need, once you go to google your already there.
Google will do math and scientific functions, as well as conversions.
Just type in something like
48 x 18 x 20 cubic inches in gallons
or if you have inch measurements but want liter results then type in
48 x 18 x 20 cubic inches in liters
'in' is the operator that lets google know it has to express the answer 'in' a different unit.
It can do any combination, like
120 x 45 x 50 cc in imperial gallons
it can handle abbreviations as well, like above I said cc which is cubic centimeters. It will recognize cu in, gal, etc
And while your there you can do other things, like
24 celsius in f
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