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Old 10-15-2016, 06:53 AM
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math question regarding scales

I'm dyslexic and it affects my spelling and maths I have no maths logic whatsoever and can just about grasp basic arithmetic.
I have two questions
I want to have a go at designing some models and I want to know by what percentage to reduce original measurements down to get 1:25 scale.
Also I have a model railway wagon that is 00/HO scale, that I'd like to model to 1:25.
If anyone can give me a simple process I can use the calculator to get the right measurements that would be great.
I will probably draw the models in sketch up as I'm familiar with it.

While am asking you want to build Enrico's railgun which is in 1:35 scale by what percentage do I increase the PDF file to make it 1:25 scale.
Thanks for any help you can give this math numpty.
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Old 10-15-2016, 07:27 AM
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Try this:
Scale Calculator :: ZarkovModels Paper Model Store

(To reduce from original measurements to 1/25 scale you can also just divide by 25)
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Old 10-15-2016, 08:08 AM
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"While am asking you want to build Enrico's railgun which is in 1:35 scale by what percentage do I increase the PDF file to make it 1:25 scale."

35/25 x 100 = 140%

Good Luck !
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Old 10-15-2016, 08:12 AM
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Basically you divide the scale you have by the scale you want.
You have a 1:35 scale model and you want to convert it to a 1:25 scale model.

1:35 to 1:25
35(what you have) divided by 25(what you want) = 1.4

To get the percentage multiply the result by 100
1.4 x 100 = 140 so that would be 140%.

You would increase the 1:35 scale model by 140% to get a 1:25 scale model.
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HO is usually around a 1:87 scale.

87(what you have) divided by 25(what you want) = 3.48
3.48 x 100 = 348

Increase the HO scale model by 348% to get a 1:25 scale model.
--------------------------------------------------------------------
You will have to make sure the parts will fit onto the maximum size page you can print when you increase the size.
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Old 10-15-2016, 01:57 PM
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thanks cblf49,zacopious and scetoaux. A great help. I should be okay on paper size as I got a Brother printer that will print on manual feed A3 sheets which is a 1:25 scale will fit on.
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