Cylinder volumes

CathyB

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Jan 2, 2020
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Hi Peeps,

I am trying to calculate a recipe for a cylinder 3.75cm radius and 25 cm tall but the amount of oils are only 110g in total- can anyone advise please?
 

Yooper

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Sep 7, 2019
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Upper Peninsula of Michigan/ Florida Gulf Coast
I think that the calculator only works for square/rectangle molds.
For a cylinder, the volume of a cylinder is calculated using Pi times radius x radius x height. That gives you the volume in cubic inches, and then if you multiple that by 0.4 you should get the total amount of oils needed. That should work.
 

CathyB

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Jan 2, 2020
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6
Hi Yooper, thank you so much, I will try again. The calculator in the recipe builder does say cylinder, but, as you say it doesn't work as well as the square/rectangle choice.
can you explain why multiply by .4- is that oil weight as I prefer to work in grams?
Also (if you don't mind explaining!) how do I work out oil weigh for 11044 cm3 as that's the volume of my cylinder?

Many thanks
Cathy
 
Last edited:

Yooper

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Sep 7, 2019
Messages
274
Location
Upper Peninsula of Michigan/ Florida Gulf Coast
Yes, that's the oil weight. It's .4 of the volume- it's not always perfect (it depends on the ratio of the water amount), but it's generally a great place to start. This assumes "full water", with no water discount.

I'm metric challenged, but that formula should also work for cm/grams. It's the same formula just different names for the measurements. V=πr²h (volume = pi times radius squared times height) then a percentage of that volume is used for the oils.
 

jeboz

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Nov 23, 2019
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I just used the calculator as well for a pipe and only half filled the mould with the total weight it gave me.
When looking back I thought it may have meant diameter instead of radius but that gave a monster figure of oils.
 

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