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How to Calculate The Capacity of Water Tank And Construct Any Shape of Tank For A Specific Capacity


simple calculations

Generally water is stored either in a cylindrical tank or in a square tank. We can easily find out the capacity of water storage tank of any size in liters. For eg. if you want to find out the capacity of a square water tank measuring 1m length, 1m breadth, 1m height, first convert meter to cm. As the formula to find out the volume of cube is a^3 we can get answer as 1000,000 cc (1 m = 100 cm)

1000 cc is 1 liter

Therefore above said cubic tank can hold 1000 liters.

By this same method we can easily calculate the capacity of tanks in various sizes.

How to Construct Any Type of a Water Tank for a Specific Capacity

We can easily construct any type of water tank like cylindrical, cubical and rectangular for a specific capacity. For instance, if you want to get measurements of tank in any shape to store 5000 liters, you will feel easy with following examples. But, you need to count only inner measurements of tanks to get accurate answers.

Let us try to find out the side of a cubical tank to store 5000 liters.

Formula for the volume of a cube = a^3, a = the side of cubical tank

Specific Capacity = 5000 liters (i.e.) 5000,000 cc

Therefore a^3 = 5000,000 cc

The side 'a' = (5000,000)^1/3 = 170.99 cm

Similarly we can find out the measurements of a rectangular tank holding 5000 liters

Formula for the volume of a rectangular tank is l*b*h

Say the length is 1.5 times breadth and the height is equal to breadth

Now the volume of the tank can be written as 1.5*b*b*b = 1.5*b^3

Specific Capacity = 5000 liters (i.e.) 5000,000 cc

Therefore 1.5*b^3 = 5000,000 cc

Now 'b' will come as [5000,000/1.5]^[1/3] = 149.38 cm

Now we can easily get length, breadth and height of the tank as follows, l = 224.07 cm, b = 149.38 cm, h = 149.38 cm which can hold 5000 liters of water

The same way we can easily design a cylindrical tank to store 5000 liters

Formula for the volume of a cylinder is 3.14*r^2*h

Say height is 2 times radius of the tank

Now the volume of the tank can be written as 3.14*r^2*2*r = 6.28*r^3

Specific Capacity = 5000 liters (i.e.) 5000,000 cc

Therefore 6.28*r^3 = 5000,000 cc

Now 'r' will come as [5000,000/6.28]^[1/3] = 92.68 cm

Now we can easily get height and radius of the cylindrical tank holding 5000 liters as follows, h = 185.36 cm and r = 92.68 cm

You can also try to find out the measurements of tanks for different capacities.


Deepak8426 on May 07, 2016:

Dear Sir, i have to create 3000 ltr of water tank with 5 ft length, 3 ft breadth, i cant understand how much it's depth to store 3000 ltr water. please suggest.

PRAVEEN from BANGALORE on August 23, 2015:


I need find out the my UGR tank capacity Width: 24f.4'' ,Lang ht 32f.6'' and Hight 8f.1'' pls replay me

pragneshprajapati on April 08, 2015:

hello sir,

how r you,

i want to calculate thickness of of h.d.p.e plastics tank as per capacity. my tank capacity is 60 kl = 60,000 litre, so how much wall thickness get for this tank, tank size: approx 4 mtr dia x approx 4.8 mtr heigh.

but its thickness = ? , i dont know

ratnaveera (author) from Cumbum on June 23, 2012:

Hello sdhiman111, Thanks for visiting this page. Thickness is depending upon the material used for the construction. 5 mm wall thickness will be enough for the ms tank.

sdhiman111 on June 22, 2012:

I want calculate the thickness of body plate to store the 5000 ltr. water in tank

ARIF JAAN on April 26, 2012:

Dear i want to calculate the cost of water tank e.g.

its capacity is 50000 gallons i want to know that if i sell a 20000 gallons the remaining 30000 gallons know i need a per cost of that anyone please help me thanks

shamskpm on January 21, 2012:

Hi, Ratna,

Im Shams, our house is under construction. we prefer to use ceramic disc shower mixers in the bath rooms. I wish to know the ideal height for an Overhead Tank from the roof height of +680Lvl. or please advise us for an economical solution to get the right pressure in all mixers especially in first floor.


subhash7 from KSA on November 24, 2011:

Hi, Ratna ..

i am working in fiber glass company as draughtsman. And i want to know TANK calculations each and everything in simple way our metric in meters and letters if can mail send a mail to me sureshgiri.gs@gmail.com.

So i hope u can help me out of this.

ayadi ariyo on August 09, 2011:

thanks for your reply

ayadi ariyo on July 28, 2011:

i am a welder based in tank construction i just need a simple formular for calculating the volume of a tank.kindly send it to my email ayadiariyo@yahoo.com

shaik on June 14, 2011:

I need to known the tank capacity for my fire pump which is 120gmp. can any help me regarding this

ratnaveera (author) from Cumbum on June 06, 2011:

Dear sujay, It's very easy to calculate the size of a rectangular tank that can hold 27000 liter. The formula to the volume of a rectangular tank is l*b*h. Say the length is 2 times breadth and breadth is equal to the height. Now 2b*b*b = 27000 liter

b^3 = 27000/2

b^3 = 13500*1000 cc


b = 238.11 cm

l = 476.22 cm

h = 238.11 cm

That's all.

sujay on June 06, 2011:

dear sir i have 27000ltr capcity how to find size of rectangular tank

Maldonagus on April 10, 2011:

How do i know the pump on and pump off level of an existing hydro tank and level on level off of a water storage tank

satish on April 09, 2011:

if i have 0.02cc cartridge then how much fluid will pass through that cartridge. pressure variation can be effect on volume of fluid

faheem on February 09, 2011:

hello ma'am...i need to design an overhead steel square water tank of size 2m x 2m x 2m at a height of 3mts...

bhanu on February 08, 2011:

Mam, I want to calculate the capacity of concrete bucket having upper diameter 700mm, lower diameter 400mm & height 550mm. please tell me as soon as possible.

ratnaveera (author) from Cumbum on February 05, 2011:

Dear trix, Thank you for coming here and your nice question. Here is your answer


Your required tank capacity is 20000*4.54 liters = 90800000 cc

your cylinderical tank height is 15 ft = 450 cm

Formula for the volume of a cylinder is 3.14*r*r*h

Now substitute the values

90800000 cc = 3.14*r*r*450 cm

r*r = 90800000/[3.14*450 cm]

r*r = 64260.438

r = 253.49 cm

You can check out it now! The r value is correct to my knowledge. Thanks again! You are always welcome friend!

trix on February 05, 2011:

i used your method to calculate the height of my cylindrical tank if i want to calculate the head how would i go about this i got 15 feet for the height and the capacity of the tank is approximately 20000gallons

Tom on January 18, 2011:

Here is a easy way to figure it out! http://volumeformula.org/cylinder.html

ratnaveera (author) from Cumbum on January 13, 2011:

Dear Sanjay, Thank you for your question. Could you tell me what shape of tank to be constructed?

sanjay on January 12, 2011:

Dear Ratnaveera, I want to construct 100000 Liters water tank for our nursery can you suggest me dimensions for the tank and design?

bhanu on December 22, 2010:

thanxxxxx a ton mam.... !!

ratnaveera (author) from Cumbum on December 18, 2010:

Dear bhanu, Say height is 2 times r. Then formula to find out the volume of the cylinder is 3.14*r*r*2r which equals

20000000 cc. Therefore 20000000/6.28 = r^3. Now radius of the tank can be calculated as 147 cm and height as 294 cm

bhanu on December 18, 2010:

hello, i want to make 20tons capacity cylindrical tank. so what is the formula and dimensions, radius and height.

Santhosh Kumar on December 16, 2010:

Dear sir Wat is CFM

chandu2373 on November 27, 2010:

Dear Ratna can u help me up with this how can i calculate

volume of an elliptical cylinder in litters where i am having all the three sides i.e length of tank is L-289.5cm, width of tank is W-193cm, height of tank is H-134.6cm

Karthikeyan on November 21, 2010:

Good and useful..

ratnaveera (author) from Cumbum on November 19, 2010:

Dear Shadab, Thanks for your nice question. CC means cm cube. That is cm x cm x cm.

Shadab on November 19, 2010:

Ratna What Is CC?

143 on August 16, 2010:

8x6x15 sized tank=? liters

dheeraj on June 04, 2010:

I have an underground tank and want to calculate that how much liters of water it contains. So, please tell me how can I get to know its capacity. For your help I have taken measurement as breadth=4 inch length=5 inch and height=6 inch. Please reply on id as dheeraj142@yahoo.co.in

noman on June 02, 2010:

thnx for the help.. and can u tell me water flow mainaining formula?? eg i have to get 2 ltr per second water from over head tank to ground tank..and same flow for ground tank to over head tank..

ratnaveera (author) from Cumbum on May 25, 2010:

Dear noman, Happy to know that my answers are helpful to you. I am a chemical Engineer. I am not sure about helping you on mechanical field doubts. Any way you ask your questions and let us try!

noman on May 25, 2010:

Thnx Buddy..

which field u r related to?

if i need to ask any formulae related to mechanical field..

can u help me?

Thnx again

ratnaveera (author) from Cumbum on May 25, 2010:

Dear noman, Thanks for your questions. The formula to find out the volume of a cylindrical tank is 3.14*r*r*h, r=radius of the cylindrical tank and whereas h=height of it.

First you need to convert measurement of tank into cm. Then only you get easily the quantity by volume. For eg. if r=100 cm and h=150 cm. The quantity of that cylindrical tank is coming as 4710000 cc that is 4710 litres.

The formula for the square tank is a^3, therefore a^3=5000000 cc, a=170.9 cm Once again thanks for your questions. Hope this would be useful for you!

noman on May 25, 2010:


if i need to take out the capicity of cylindrical tank then which formula i shud use??

and 2nd thing.. for eg if i have to design a square tank for 5000 ltrs water then which formula i have to use??

Amrith on May 21, 2010:

Nice stuff !! This helped me .. Thank you very much !

ratnaveera (author) from Cumbum on January 03, 2010:

Dear Ragu, Thanks for your question. First you need to convert 200000 litres into cc and it'll come as 200000000 cc. If it be a square the side of the tank would come as 584.8 cm. If it be a rectangular tank with length 1.5 and height 1 times breadth, then the formula to find out the measurement is 200000000 cc= 1.5b*1b*1b

= 1.5b^3

Therefore b= 510.8 cm l= 766.2 cm h= 510.8 cm

Ragu on January 02, 2010:


I just like to know how to calculate the capacity for 200000 ltrs in rectangular tank. kindly reply please

ratnaveera (author) from Cumbum on November 22, 2009:

Dear khurshed, First you need to convert the measurement into cm. For eg. if you have 2 m breadth and 1 m height and 3 m long tank. You need to convert them into cm as 200 cm, 100 cm and 300 cm. Now you will get the volume multiplying them l*b*h, 200*100*300=6000000 cc (i.e) 6000 litres

khurshed on November 22, 2009:

hi i have 6000x3000x3000 water tank i want to know the volume of total please reply

sks on September 27, 2008:

nice info thanks