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post #1 of 6 Old 09-11-2012, 08:29 AM Thread Starter
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volume three-side polygon aquarium

Pop needs input to calculate concave three sided polygon aquarium volume in gallons. I’am Not good with numbers have to take shoes off to count to 21
See picture for details;

Most websites like this Calculating Aquarium Volume - The First Tank Guide - How Can I Figure Out How Much Water My Fish Tank Holds? calculate based on a rectangle not a three-sided polygon.




Dogpiled it without getting a satisfactory solution.

Thank you for caring and any suggestions……pop

Last edited by pop; 04-10-2013 at 04:34 PM.
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post #2 of 6 Old 09-11-2012, 10:57 AM
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It is 36 gal. LxWxH in inches; x .0044 =; divided by 2 = 36.8 gal.

"I once thought I was brave; now I can't stop crying." By kendal Payne.
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post #3 of 6 Old 09-11-2012, 01:05 PM Thread Starter
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Hey thankful tropicals:
What does the .0044 represent.? Is it the concaved front?
In the formula LxWxH how is the expanding Width compensated for, it starts width 0 inches and ends 42 inches?

On the bright side I don’t think I toted more than 30 some gals.
Thanx for your help! Pop
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post #4 of 6 Old 09-11-2012, 01:34 PM
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it is the ratio for cubic inches to a gallon. As > one cubic inch equals .0044 gallons.

figure out the volume of any container in cubic inches and multiply by .0044 will give you Gallons.
Example. A 15 gallon tank measures 12"x12"x24"=34560 cubic inches, x .0044 = 15.2 gallons.

"I once thought I was brave; now I can't stop crying." By kendal Payne.
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post #5 of 6 Old 09-12-2012, 08:47 AM Thread Starter
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Hey Tankful :
I see now how cubic inches are converted to gallons. I found out I have a ¼ cylinder aquarium. when I did the math I came up with 67 gal this can not be right. Try again…PI x R squared x height x .0044 = gallons / 4
3.14 x 729 x 23 x. 0044 / 4 = 57 gal. don’t believe the aquarium is this large no way did I tote that much water.

I will go with your 36 gal. answer.

Somehow gallon rating seems non useful to me. What good is volume measurement when so much area is taken by substrate, deep sand beds, plants and other decorations means a 40 gal aquarium might actually be rated 30 or even 25 gals of available water..

Dazed and confused pop
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post #6 of 6 Old 09-12-2012, 10:10 AM
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Your right there , surface area is what counts

"I once thought I was brave; now I can't stop crying." By kendal Payne.
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