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Page 2 about
Calculate Aquarium Volume
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This
page contains Customer Comments and our Replies
about How to Calculate Aquarium Volume. Click
here to go back to the first page in this discussion
about Calculating Aquarium Volume.
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Customer Comments
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I really love your website,
honestly. I've taken virtually
all your advices into account
and managed to successfully
sustain my tank. Great,
keep on the good pace.
But Hold on, there's a major
setback in this website,
the English System MUST
GET RID OF THIS VILE NOW
PLEASE! Where I live we
use logic, an aqaurium that
is 60cm in legth, 40cm height,
20cm wide boasts a volume
of 48 liters, hence 40 x
60 x 20= 48,000 cubic cm,
divided by a thousands and
walla you get 48 liters!
I've also attented an american
school and I know that AMericans
are not that stupid and
if they really want they
could grasp this type of
unit too. Trust me on this!
Naomi G. |
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Reply.
Hello Naomi and thank you for your advice. I'm sure
you are right, but I just can't seem to think metric.
I like the fact my
foot is about a foot long, and a digit in my finger
is about an inch long, and there are many other
things in the foot, inches, and pounds way of doing
things that seem more intuitive to me, even if the
math is less convenient.
The aquarium in your
example is about 16" x 24" x 8" = 4/3 ft. x 2 ft.
x 2/3 ft. = 16/9 cubic feet. Multiply by 25/3 to
convert cubic feet to gallons: 16/9 x 25/3 = 400/27.
Which I can "see" is about 15 gallons. Actually
I did all of this in my head, and did it quite fast.
On the other hand
I can get the 48 liters fast just like you did.
Next I know a litter is about 5/4 of a quart or
5/16 of a gallon, and 48 x 5/16 is again easy to
"see" is 15 gallons.
But I'm more used
to doing it in inches.
Thank you for trying
to help me.
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Customer Comments
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Dear AquariumFish.net
Just received and read my
first issue of your e-mail
newsletter (#4) What a great
info filled missive! Thank
you for awakening me to
this source. I will be on
your list forever ( and
will become a buyer also)
I am sure.
In the section "how to measure
a fish tank", Naomi G has
chosen to request a change
to metric measurements.
She states that she uses
logic ( I assume that means
our 50 states don't) and
she has "attented" an American
school and we (Americans)
are not stupid and should
start thinking in metric.
She is correct: I should
understand metric. I am
not stupid. However, I,
like her, make calculations
in my head using the system
I was brought up using.
I need reference books and
a calculator to understand
the metric system.
Please do not go metric
unless you provide both
standards.
Graham |
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Reply. Hello
Graham. Thank you for your email and for your comments
about the metric system. We're glad that you enjoyed
our newsletter. |
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Customer Comments
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Hi,
I was just searching to find
out how to calculate the volume
for my aquarium. The trouble
I'm having is that my tank is
a hexagon, and the measurements
of it do not appear to be standard.
Do you know how I would measure
the width?
The longest width is 25.5" and
the 6 panels are 12" long. The
depth I believe is 24" (from
flat edge across to flat edge).
The height is 24.75".
Could you please help me?
Thank you,
Karen |
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Reply.
Hello Karen. Lets calculate the volume of your aquarium,
which has a hexagon for the base and a height of
24.75". Click
here to see a picture of a hex-aquarium.
The formula for volume
is always the base times the height, which you measured
24.75". So all we need is the area of the base.
Since all 6 panels
in your aquarium are 12", the base is a so-called
regular hexagon with all the sides measuring 12".
The area of this regular hexagon is 6 times the
area of an equilateral triangle with each side 12".
Now think of a 12"
equilateral triangle, and divide into two right
triangles with one side 6" and hypotenuse
12". The other side will have a length equal to
the square root of 12x12 - 6x6, which equals the
square root of 144 - 36, which is the square root
of 108, or about 10.4".
The area of the right
triangle is 1/2 x 6 x 10.4, and the area of the
equilateral triangle will be twice as much, which
is 6 x 10.4 = 62.4 square inches, so the area of
the base of your aquarium is 6 x 62.4, or 374.4
square inches.
The volume of your
aquarium is the area of the base times the height
= 374.4 x 24.75 = 9296.4 cubic inches. Now
multiply by 0.00433 to convert cubic inches to gallons:
9296.4 x 0.00433
= 40.1 gallons, which answers your question.
When you calculate
something like this, and the answer is important,
because you may use the answer to determine how
much Quick Cure or Salt to add to your aquarium,
then it's best to double check your calculation.
Or you might end up forgetting that the equilateral
triangle has two right triangles, and get an answer
that is off by a factor of 2.
Here is one way to
double check the answer. The hexagonal base of your
aquarium could fit inside a circle with a radius
of 12" and have an area of about
pi x 12 x 12 = 3.14
x 12 x 12 = 452.2 square inches
which is somewhat
bigger than the 374.4 square inches for the area
of the hexagon inside the circle. So that checks.
A circle with a radium
10.4" would fit inside the hexagon, and that circle
would enclose an area of about
pi x 10.4 x 10.4
= 3.14 x 10.4 x 10.4 = 327.8 square inches
which is less than
the 374.4 square inches for the area of the hexagon.
So that checks too.
Also the area of
the hexagon should be about half-way between the
area of the inner circle and the area of the outer
circle. The areas are about 327.8, 374.4, and 452.2,
so those numbers look about right.
Now lets check these
calculations with a measurement. Your aquarium is
24.75" tall. When you change 20% of water, as recommended
repeatedly in this web site, you should remove 20%
x 24.75 = 4.95, or about 5" of water. So measure
down from the water surface 5" and put a mark on
the glass with a marker pen.
Now remove water
down to the mark and keep track of how much water
you remove. For example, you could use a clean one-pint
measuring cup. You should get close to 64 pints,
which is the same as 8 gallons, or 20% of the 40
gallons, that we calculated in your aquarium. (Be
sure to thoroughly clean the measuring cup, when
you finish using it.)
You will probably
measure less than 64 pints. Maybe you'll get 61.
Because the measurements for your aquarium that
you gave in your email were probably the outside
measurements, and the water fills the inside of
your aquarium.
You could improve
the calculations above by doing them again with
the inside measurements, and perhaps subtracting
the volume of the ornaments, etc. Click
here for more about doing that.
I hope this has thoroughly
answered your question.
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Customer Comments
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Thank you!!!!
I would like to thank you
so much for responding.
My calculations came out
similar, when I focused
on the formulas, but I was
still unsure if I was doing
it correctly.
I couldn't find a 40 gal
hex listed anywhere I looked
on the Internet, so I kept
doubting my answer.
I also tried marking the
water line and removing
a gallon of water, and then
measuring. I was really
close to 40 gal. again.
I haven't had to add any
medications to my tank as
yet, (knock wood) but that
possibility, and calculating
the amount of fish I can
put in there safely, is
why I needed confirmation.
Thanks again,
Karen |
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Reply. Hello
again Karen. Thank you for your reply. I'm glad
to know that you made your own calculations and
measurements, and agree with you, that knowing the
volume of your aquarium in gallons is important.
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