Mathematically challenged ....

[Anonymous]

Trying to figger out the capacity, in gallons of a tank that measures 24" long, 24" high and 4" wide. I do the lxhxw, then divide by 12 to get cubic feet, right? But that's 192 cubic feet, which is nearly 1500 gallons. What am I doing wrong????

Hmmm, if I figger 2 feet cubed is 8 cubic feet, and that's just about 60 gallons, then divide by 6, I get 10 gallons. Which is closer to what I think it should be, but I still have no idea. I am hopeless, even with a calculator.

Help.

It's for an auto-top-off reservoir that can squeeze behind my sump.

 

[Anonymous]

I think you have your numbers wrong at the beginning? 24 inches x 24 inches x 4 feet?

Would it be 2 feet x 2 feet x 4 feet? 2x2x4=16 ?

 

[Anonymous]

It's 2 feet long by 2 feet high by four inches wide. U.S. Plasitcis doesn't have them on the website, but it's in the catalog.

 

[Anonymous]

It's almost 10 gallons.

Check out this tank volume calculator.

Louey

 

[Anonymous]

Sweet. Thanks, Louey!

 

[das75]

Height x width x depth (in inches) divided by 231 equals gallons.

 

[Anonymous]

LHW / 12^3 (or 1728) is cubic feet from cubic inches... tsk tsk tsk

 

[Anonymous]

LHW / 12^3 (or 1728) is cubic feet from cubic inches... tsk tsk tsk

I have structured my life to be as far from math as possible. I think it is the best arrangement for all concerned. :lol:

 

[Anonymous]

LHW / 12^3 (or 1728) is cubic feet from cubic inches... tsk tsk tsk

I have structured my life to be as far from math as possible. I think it is the best arrangement for all concerned. :lol:

I tried that route, now I have to use it all the time

"I'll never need to use algebra when I grow up" pssssh, yah right

 

[Anonymous]

LHW / 12^3 (or 1728) is cubic feet from cubic inches... tsk tsk tsk

I have structured my life to be as far from math as possible. I think it is the best arrangement for all concerned. :lol:

I tried that route, now I have to use it all the time

"I'll never need to use algebra when I grow up" pssssh, yah right

I've said that once or twice and now use it all the damn time.

 

[Anonymous]

Trying to figger out the capacity, in gallons of a tank that measures 24" long, 24" high and 4" wide. I do the lxhxw, then divide by 12 to get cubic feet, right? But that's 192 cubic feet, which is nearly 1500 gallons. What am I doing wrong????

Hmmm, if I figger 2 feet cubed is 8 cubic feet, and that's just about 60 gallons, then divide by 6, I get 10 gallons. Which is closer to what I think it should be, but I still have no idea. I am hopeless, even with a calculator.

Help.

It's for an auto-top-off reservoir that can squeeze behind my sump.

You were really close there, you had the lxwxh right, its just to convert something from cubic inches to cubic feet you have to divide it by 1728 or divide it by 12 three separate times.

Its easy to remember if you think of it this way.

1 cubic foot is 12 inches long, 12 inches high, and 12 inches wide. That's 12 X 12 X 12 which equals 1728 cubic inches or 1 cubic foot

Then just convert cubic feet to gallons which it looks like you found a converter for since you did the 192 to 1500 thing.


hope that helps in the future.

 

[Anonymous]

I like this one.

http://www.digitaldutch.com/unitconverter/

 

[das75]

Though I still seem to use gallons (and imperial ones at that), got to like the metic.

1 cubic meter = 1000 litres

 

[Anonymous]

Trying to figger out the capacity, in gallons of a tank that measures 24" long, 24" high and 4" wide. I do the lxhxw, then divide by 12 to get cubic feet, right? But that's 192 cubic feet, which is nearly 1500 gallons. What am I doing wrong????

Hmmm, if I figger 2 feet cubed is 8 cubic feet, and that's just about 60 gallons, then divide by 6, I get 10 gallons. Which is closer to what I think it should be, but I still have no idea. I am hopeless, even with a calculator.

Help.

It's for an auto-top-off reservoir that can squeeze behind my sump.

Perhaps this method has already been mentioned. Accurate to 2 significant digits there are 7.5 gallons for each cubic foot. Which is 3/4 of 10. So just to get in the ball park I take the measurements in feet. Then compute the cubic feet. Then subtract 1/4 from that and move the decimal over one digit.

So for a 24"x24"x4" tank you have 2'x2'x1/3'=4/3 cubic feet. 3/4x4/3=1. move decimal one plact right=10 gallons.

So that should be a 10g. now I have to check and see what others came up with.


Edit close enough. And easy enough to do in your head at club meetings

 

[Anonymous]

Height x width x depth (in inches) divided by 231 equals gallons.

This is the most straight forward way to calculate the volume, IMO.

 

[Anonymous]

Height x width x depth (in inches) divided by 231 equals gallons.

This is the most straight forward way to calculate the volume, IMO.

Sure as long as you have a calculator handy.

So take a 48"x24"x24" tank and run it through the calculator.

Now with no calculator

1) convert to feet: 4x2x2

2) 3/4 4=3x2=6x2=12

add 0 120g. No calculator needed IMHO.

 

[Anonymous]

Height x width x depth (in inches) divided by 231 equals gallons.

This is the most straight forward way to calculate the volume, IMO.

Sure as long as you have a calculator handy.

So take a 48"x24"x24" tank and run it through the calculator.

Now with no calculator

1) convert to feet: 4x2x2

2) 3/4 4=3x2=6x2=12

add 0 120g. No calculator needed IMHO.

Your are wise beyond your years oh great one....


:roll:

 

[Anonymous]

For rough calcs it would be easier to remember that 1 ft^3 is approx 7.5 gal.

 

[Anonymous]

Height x width x depth (in inches) divided by 231 equals gallons.

This is the most straight forward way to calculate the volume, IMO.

Sure as long as you have a calculator handy.

So take a 48"x24"x24" tank and run it through the calculator.

Now with no calculator

1) convert to feet: 4x2x2

2) 3/4 4=3x2=6x2=12

add 0 120g. No calculator needed IMHO.

Sounds good, to each their own. I did say "IMO". :wink:

 

[Anonymous]

bob's got a great idea, unfortunately what if wasn't a "nice" sized tank

6' x 18" x 18" ? remember the title topic is for the mathematically challenged, sure I could do it in my head but I'm not mathematically challenged.

3 * 6 * 3 * 3 / (4 * 2 * 2 )