How many gallons is this???

6' X 12" = 72" (convert feet to inches)
231 Cubic inches in a gallon

So:

72" x 20" x 18 " = 25920 cubic inches

25920/231 = 112.2 gallons
 
Nope a U.S. Gallon is 231.000001 cubic inches

The 234 Inches is a common mistake. The long of the short is that the amount of energy stored in a gallon of fuel depends on the temperature of that fuel.

In the 70's Hawaii mandated that Fuel be metered at 234 Cubic Inches to the gallon instead of 231. They did this because fuel stored at 60F has more energy than fuel in your gas tank at 90F. Why? Because it expands. The same volume of fuel takes up more space when it is warm, so you get less than you pay for.
 
well the more ya know...

I got that 234 number from some place years and years ago. going to bug me now. i'll be digging through my old fish books :)
 
Tank Height = 18"
Tank Width = 20"
Tank Length = 72 "
Glass Thickness = 1/4"
Approximate Gallons = 112

I used the GARF caculator....BeanAnimal was right.
You win a set of Ginsu knifes! They cut through a tin can...lol
 
It would not surprise me a bit if the garf calculator used the wrong constant. It is fairly common that people think 234 is correct. Gotta love the logic of politicians.
 
http://reefcentral.com/calc/vol.php

There is a calc on this site. There used to be one for hex shapes as well, but it was incorrect (off by a factor of 2 iirc). I don't see it listed anymore, so they may have removed it when I e-mailed an admin about the issue over 2 years ago. Just saying double check any "plug and chug" with your own math.
 
Google agrees search for "1 gallon to cubic inches"

1 US gallon = 231.000001 cubic inches

I tend to use google to do these type of calculations.

Search for "72 X 20 X 18 cubic inches to gallons"

72 X 20 X (18 (cubic inches)) = 112.207792 US gallons
 
BTW... I mistyped above. I meant to say that "I would not be surprised if many other online calculators used the wrong constant". The garf page has it correct, as does google.
 
RSW686::

Good thing you carried it out 5 decimal places past 112.2 ! That extra half an ounce could throw his salinity ALL outta whack!
 
<a href=showthread.php?s=&postid=10650649#post10650649 target=_blank>Originally posted</a> by BeanAnimal
It would not surprise me a bit if the garf calculator used the wrong constant. It is fairly common that people think 234 is correct. Gotta love the logic of politicians.
Click to expand...

It would suprise me if the GARF calculator was wrong. I learned the formula sometime in 1976 as a freshman in high school. Since I created the calculator...
 
<a href=showthread.php?s=&postid=10672785#post10672785 target=_blank>Originally posted</a> by GARFVolunteer
It would suprise me if the GARF calculator was wrong. I learned the formula sometime in 1976 as a freshman in high school. Since I created the calculator...
Click to expand...

If you look above, I corrected my post. My fingers were typed one thing and I was thinking something else.
 
<a href=showthread.php?s=&postid=10673087#post10673087 target=_blank>Originally posted</a> by crazinezz978
my book says 234... well this book also tells me that 1.018 is ideal for reef keeping so, 231 sounds right.
Click to expand...

I would say that the author and editor of your book needs to check their facts :)

Care to tell us what book?
 
Another way to do the calculation


LxWxHx.0043= gal for rectangular tanks

Diameter squaredXheightX.0034=gal for round tank


Side squaredX6xhX.0043/2= gal for octagon tank
 
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