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 January 12th, 2016, 08:39 AM #1 Newbie   Joined: Jan 2016 From: In a house Posts: 3 Thanks: 0 Shape Volume Calculations So I'm realising I should have paid more attention in school, because I'm sure this would be a lot easier. Anyway, I work in the metal industry and am constantly having to go to an online metal weight calculator to figure out information I need. That'd be fine if the internet speed where I work wasn't essentially dial up! Using a calculator is much faster or even better, a spreadsheet I could enter details into. I therefore need to know how to work out the volume of different shaped pieces of metal so I can multiply it by the density and get the overall weight of that item. Square and rectangular shaped items are easy... length x width x height x density. It's cylindrical, hollow and odd-shaped items that I'm struggling with. I'd like to know how to calculate the volume of... Solid Cylindrical items Hollow Cylindrical items (tube/pipe) the metal weight only not the volume the inside can carry Hollow square/rectangular items T shape items Any help would be greatly appreciated. Last edited by skipjack; January 12th, 2016 at 08:51 AM.
 January 12th, 2016, 09:35 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,835 Thanks: 2162 For a metal pipe, you need to find the interior volume accurately, so you need an accurate figure for the internal diameter. You also need the external diameter of the pipe. Suppose, for example, that the internal diameter is 1.5 cm, the external diameter is 1.75cm, and you calculate that the interior volume is 900 cm³. Now multiply that by (1.75/1.5)². The result is 1225 cm³. By subtraction, the volume of the metal is 325 cm³.
 January 13th, 2016, 02:19 AM #3 Newbie   Joined: Jan 2016 From: In a house Posts: 3 Thanks: 0 Could you dumb that down for me please? Generally, in this industry we use mm and not cubic measurements. If I was to work this out on a calculator. How would I do it? Much like the example I gave for sold square/rectangular items.
January 13th, 2016, 02:59 AM   #4
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 Originally Posted by skipjack For a metal pipe, you need to find the interior volume accurately, so you need an accurate figure for the internal diameter. You also need the external diameter of the pipe. Suppose, for example, that the internal diameter is 1.5 cm, the external diameter is 1.75cm, and you calculate that the interior volume is 900 cm³. Now multiply that by (1.75/1.5)². The result is 1225 cm³. By subtraction, the volume of the metal is 325 cm³.
Ok so after some googling I get it... kind of. So I work out the volume of the inside dimension which is... From your example...

Volume = Pie (can't find the character on an iPhone) x radius x height.
V = pie (0.75cm) squared x height (10cm for example)
V = 5.625cm pie
V = 17.67cm cubed

So from your example to find the pipe volume is then...

17.67cm cubed x (1.75/1.5) squared and then subtract the 17.67cm cubed?

 January 13th, 2016, 03:32 AM #5 Global Moderator   Joined: Dec 2006 Posts: 20,835 Thanks: 2162 Yes.
 January 24th, 2016, 01:45 PM #6 Newbie   Joined: Jan 2016 From: England Posts: 24 Thanks: 0 Why not put it in a square prism box full of water then measure how much the water rises? If for instance you have a container 10m by 10m then put in your object then let's say the water rises by 1m. That means the volume of your object is equal to 10x10x1m which is 100m^3 This is the only reasonable way of finding the volume of really iregular or overly compund shapes.

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