Questions and answers on how to convert things from one unit or system to another

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conversion help

Tue Feb 08, 2011 1:09 am

hi, could someone please tell me the weight of this cylinder i am fabricating.

the diam is 29" the hight is 5 feet(60")

i am using 3/8" thick stainless steel @ 15.30lbs/sq.ft.

it obviously needs a top and bottom. any help is greatly appreciated. especially if you can show me the calcs you used to obtain the answer.

Re: conversion help

Wed Feb 09, 2011 5:19 am

1. Calculate the outer cylinder volume:
Radius = 14.5in
Height = 60in
outerVolume = 39 631.191325 cubic inches

2. Calculate the inner cylinder volume:
Radius = 14.5 - 3/8 = 14.5 - 0.375 = 14.125
Height = 60 - 3/8(top) - 3/8 (bottom) = 60 - 0.75 = 59.25
innerVolume = 37 137.71169 cubic inches

Note: I've used this cylinder volume calculator:

3. The stainless steel frame volume is equal to:
(!) stainlessSteelVolume = outerVolume - innerVolume = 39631.191325 - 37137.71169 = 2493.479635 cubic inches

3. We have to convert your stainless steel density (15.30 lbs per sq.ft per 3/8") to density in lbs per cubic inch:

3.a) 1 sq.ft = 144 square inches (
3.b) Density = 15.30 lbs per 144 square inches per 3/8 inch = (*** multiply by 8 ***) = 122 lbs per 144 square inches per 3 inch = 122/144/3 lbs per cubic inch = 0.28241 lbs per cubic inch (!!).

Note: The calculated 0.28241 lbs per cubic inch for your steel is corresponds to average steel density (0.285406) as reported by here:

4. Finally, we can calculate the stainless steel frame weight:

4.a) The volume of your stainless steel frame is equal to 2493.479635 cubic inches (!)
4.b) The stainless steel density is equal to 0.28241 lbs per cubic inch (!!)

Weight = Density * Volume = 0.28241 lbs/cubic inch * 2493.479635 cubic inches = 704.18358372035 lbs

Please, double check and validate all these results before actual construction.

I hope these calculations are helpful.

Re:gold conversion help

Fri Feb 25, 2011 10:33 pm

100gm 900.000gold finegold converted to 918.000? how much 995.000 to add?

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