Issue calculating tank size.....

jetajockey

Member
I decided to measure out these 40 gallon breeder tanks and they are coming up differently than the 40 gallon breeders listed here

the general tank size (sorry was in a hurry measuring so not perfect) is
36 x 18.5 x 14.25
The sites with the tank sizes say that the 40 breeder is this
36 3/16 x 18 1/4 x 16 15/16

the obvious difference there is on the Height.

Anyhow so I went to the tank calculator on the FL site, and I come up with this.

Aquarium Size is 41.08 US Gallons

Rounding down, just for kicks, to 36x18x14 gives this result:
Aquarium Size is 39.27 US Gallons

So is the tank size list inaccurate or what? I've noticed that it seems to be a cut n paste on various sites when googling, and all the data seems to be the same. Am I doing something wrong?

Nutter

Member
The problem is the measuring system your using. If I take the measurements you have taken, convert it to metric it becomes 91x47x36cm. Doing some math, 91 x 47 x 36 = 153972. Divide 153972 by 1000 & you get 153.972. Round that up to 154. That's how many litres it holds. Put 154 into the calculator down the bottom & you get 40.69gal.
Take away the little bit at the top of the tank that the lids sit in & doesn't get filled & you will be near enough spot on 40gal.

It's simply the imperial measurement system used in the US. The rest of the world uses the metric system & that means mistakes are going to be made.

Shawnie

Member
Nutter said:
The problem is the measuring system your using. If I take the measurements you have taken, convert it to metric it becomes 91x47x36cm. Doing some math, 91 x 47 x 36 = 153972. Divide 153972 by 1000 & you get 153.972. Round that up to 154. That's how many litres it holds. Put 154 into the calculator down the bottom & you get 40.69gal.
Take away the little bit at the top of the tank that the lids sit in & doesn't get filled & you will be near enough spot on 40gal.

It's simply the imperial measurement system used in the US. The rest of the world uses the metric system & that means mistakes are going to be made.
that totally confused me!!! LOL
but I do agree, its a 40 gallon tank

Nutter

Member
Shawnie said:
that totally confused me!!! LOL
but I do agree, its a 40 gallon tank
It's pretty easy really. There is 2.54cm to one inch. Using that I converted the measurements in inches to cm. 36"=91.44cm, 18.5"=47cm, 14.25"=36cm. Multiply the dimensions in cm (91x47x36=153972). 1000 sq/cm = 1lt volume so divide 153972 by 1000 & you get how many litres the tank holds (153.972).
Then I cheated on converting litres to gallons by using the calculator down the bottom.

Now you know how much maths I have to do to work out what people are actually talking about on here. My mind only thinks in metric, which is much easier to use. Everything is calculated in lots of 10.

The simple way to say it though is, Jeta, you have a 40gal tank.

jetajockey

Member
I'm totally lost also, but thank you for summing it up lol.

On a side note, it is kinda funny that the US measurements, like in machinery and mechanics also called standard, although the world's standard is actually metric.

Perhaps the tank size/chart list thingy needs to be updated and corrected, if that one is off there's no telling how many others are.

Butterfly

Member
There are also two kinds of 40 gallon tanks A regular 40 gallon tank and a 40 gallon breeder tank which is taller . Did I add to the confusion?
Carol

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