How do you calculate how many gallons

[AlexsDaddy]

I want to build an aquarium, but I don't know how to calculate how many gallons it will hold. I'm sure someone on here knows how. Thanks in advance! I'm thinking 3 feet long, 10 inches high, and 8 wide. I'm thinking of putting it on a shelf. What's the weight of a gallon of water? Hmmmmmm......... That'll have to be a pretty heavy duty shelf......

 

[The-Wolf]

36" x 8 x 10 =
Water Volume............................10.88 gal (US)
Water Weight.............................90.51 lbf
Approx Total Weight...................149.37 lbf (including substrate)

 

[AlexsDaddy]

Thanks. Ummmm ....... Maybe I won't put it on a shelf after all. That's kinda heavy. So lbf is pounds? I haven't seen it put that way before.

 

[freshmike]

Approx. 10 lbs per gallon.

 

[xXMrBonesXx]

The Dimensions of the tank divided by 231

36x8x10 / 231 = 12.47 Gallons

i think i'm not 100% positive on the divider number

 

[The-Wolf]

Thanks. Ummmm ....... Maybe I won't put it on a shelf after all. That's kinda heavy. So lbf is pounds? I haven't seen it put that way before.

Yes lbf is the abreviation four pounds
I used this site for the calculations.

Sorry Mrbones, but you are incorrect on this one

 

[freshmike]

Water Type..............................Freshwater
Material................................Glass
Tank Overhead Shape.....................Rectangular
Length..................................36.00 in.
Width...................................8.00 in.
Height..................................10.00 in.
Wall-thickness..........................0.25 in.
Volume..................................12.47 gal (US)
Tank Material Weight....................28.19 lbf
Water Volume............................12.47 gal (US)
Water Weight............................103.74 lbf
Approximate Total Weight................131.93 lbf
Room Air Temperature....................78.00 °F
Water Temperature.......................78.00 °F
Heating Capability Required.............0.00 W
Approx. Total Fish Length...............24.00 in.
Mass Required for 1 PPM.................47.06 in.

 

[The-Wolf]

Water Type..............................Freshwater
Material................................Glass
Tank Overhead Shape.....................Rectangular
Length..................................36.00 in.
Width...................................8.00 in.
Height..................................10.00 in.
Wall-thickness..........................0.25 in.
Volume..................................12.47 gal (US)
Tank Material Weight....................28.19 lbf
Water Volume............................10.88 gal (US)
Water Weight............................90.51 lbf
Substrate Type..........................Sand
Average Substrate Depth.................2.00 in.
Substrate Weight........................30.68 lbf
Approximate Total Weight................149.37 lbf
Room Air Temperature....................78.00 °F
Water Temperature.......................78.00 °F
Heating Capability Required.............0.00 W
Approx. Total Fish Length...............24.00 in.
Mass Required for 1 PPM.................41.05 in.

I think there is something wrong here

 

[freshmike]

No. Because 36 x 12 x 18 is 33 gallons.....now compare that to 36 x 10 x 8....

That is DRAMATICALLY smaller...the only even close to comparible measurement is the length.


Very much like this tank......

 

[wuvmybetta]

I'm moving this to TCC,but you boys keep it up It's the first debate over numbers that I've ever seen

 

[freshmike]

 

[The-Wolf]

the weight of water is
...................lbf..........Grm..........Kg
1 Cubic cm. 0.002205 / 1 / 0.001
1 Cubic inch 0.036127 / 16.387064 / 0.0163871
1 Liter 2.204684 / 1000.028 / 1.000028
1 Gallon 8.345404 / 3785.4118 / 3.7854118
1 Cubic foot 62.42796 / 28316.847 / 28.316847

so the water in that tank is 47.19ltr which equates to
10.38036502128748 Imperial gallons or 12.466279150781021 U.S. gallons.
from this you must subtract the displcement of the substate and add the weight of the substrate. I see you did not do that in your calculation FM.

 

[freshmike]

Nobody mentioned having substrate in the tank.

 

[The-Wolf]

I assumed that as is will be a tank containg fish there would be a substrate, decoration, plants and fish. to get an accurate weight of this
you would have to take into account all these factors.
I went for substrate as that will be the second heaviest next to the water.

 

[CFC]

I assumed that as is will be a tank containg fish there would be a substrate, decoration, plants and fish. to get an accurate weight of this
you would have to take into account all these factors.
I went for substrate as that will be the second heaviest next to the water.

Why assume that? It could be a breeding/fry raising tank tank with no substrate or decor