View Full Version : Gallons in a tank

10-10-2011, 05:33 AM
Whats the correct math to find out how many gallons a tank will hold?

10-10-2011, 10:30 AM
I have no idea.

But this is lovely :)


10-10-2011, 11:00 AM
(width x depth x length) / 231 all of that in inch's. It would look something like this (48x18x21)/231= gallons for my tank.

10-10-2011, 11:01 AM
Length x Width x Height. Then divide by 231.

My 150 gallon 72" x 18" x 28" = 36,288.

36,288"/231"= 157.09 gallons

To get leaders do gallons x 3.79

157.09g = 595 liters.

10-10-2011, 11:36 AM
Yeah that's too complicated.

Click my link.. make your life much easier ;)

10-10-2011, 12:06 PM
Typical female answer.

Just use the GPS, it's easier.

True, but next time when the GPS isn't working(or your link) then you won't find ur way there(or know how many gallons)

Lol, link would be easier but it's always good to know.

10-10-2011, 12:59 PM
carrie, its not complicated

measure your tank, get a calculator.
multiple then all together and divide by 231

that is faster then opening a link.

10-10-2011, 01:25 PM
No.. it's not.

10-10-2011, 04:15 PM
thanks for the info. is there also a calculator to get the correct thickness of acrylic?

10-10-2011, 04:32 PM
Joey has one currently, and he is working on getting it up on the site.

10-10-2011, 05:43 PM
Hey Guys, it is also important to know why you divide by 231....

Simple: There are 231 cubic inches to a gallon.

Multiplying length by width by height of any square or rectangle will give you the cubic area.

So you must multiply your dimensions in inches. In which order doesnt matter.

Then divide the answer by 231 like other shave said.

If you do cm instead, like i know a lot do, then divide your dimensions taken in cm by 587.

OTHER good info to know:

A gallon of water weighs 8.3 pounds.
There are 3.78 liters in a U.S gallon. A liter weighs 2.19 pounds

Those are goo to find out how much your tank weighs.

If you want to get specific, glass weighs 2.6g/cc
Acrylic weighs 1.22g/cc

So to get really specific:

A 135 gallon tank is 72x18x24

The water in that tank would weigh 1120 pounds.

The bare tank, if glass, and if using 1/2" glass, would weigh 249 pounds.

Total weight of that tank would be 1369 pounds. Thats before substrate/other deco.

Good to know when you need to know the total weight of your tank.

I have an acrylic calculator i designed. I also have a glass one.

This forum wont host it, and they have to be put on the home page. Im going to redesign the look of that home page, and calculators, then get them up. Working on a few other calculators as well.

10-10-2011, 11:16 PM
or this link
http://animal-world.com/encyclo/informa ... m#Aquarium (http://animal-world.com/encyclo/information/calculate.htm#Aquarium) Volume Calculator