# Conversion calculator

Discussion in 'Getting Started' started by KCS, Oct 25, 2005.

1. ### KCSMember

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Anyone know where I might find a good scale conversion calculator that I can download?
2. ### MasonJarIt's not rocket surgery

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Don't know of anything specific, but what calculations do you need?

Most common conversions seem to be:

HO 1:87.1
N 1:160

N is 54% of HO....

Andrew
3. ### shortlinerMember

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KCS email me direct
Shortliner(Jack)away up here in the Highlands
4. ### jim currieActive Member

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is this what you want?

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5. ### KCSMember

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Thanks Jim but that looks like greek to me. I don't understand how percentages get mixed in. I thought it was like 1:1- 1:87 meaning 87 times "X" smaller than 1. Forgive me that my math skills are horrible. It's something I just never could grasp.
6. ### 60103Pooh Bah

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KCS:
Can you tell us how you need to use the converter?
You can use the table above with a calculator. Measure the whatever. Put the measurement into a calculator times the percent then push the % key. Result should be the dimension for your scale. Example: going from O to HO: 12" times 55 % = 6.6".
If you're working from full size, the ratios are given with the scales.
If you have a photocopier, use the percentage to change the drawing size.
7. ### 62cj5New Member

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Try This for Dave’s example x/12 is = to 55/100

You multiply 12*55 then divide by 100

So 12*55=660

Then 660 divide by 100 = 6.6

You put the percentage over 100 and x over the number you have

In real life say you wanted O scale that’s 48 to 1

That would be x/1 is = to 48 /100

1*48 =48

48 divide by 100 =. 48

If you’re real life object was 15 feet long

Your scale object would be 7.2 inches long

15*48 =720

720 divide by 100 = 7.2

You can do this faster with a calculator and easier in metric

It is easier then it looks you just have to do it a few times

PS I am no good in spelling .
8. ### MasonJarIt's not rocket surgery

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Actually, metric will not help you all that much, because the scale denominators are all "odd" - 87, 48, etc...

Charles,

If you can tell us how you want to use it, or what calculations you need (as per David's message), we can certainly help.

Andrew
9. ### ezdaysOut AZ way

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Jim's table is showing the conversions from one scale to another. That's the reason for the percentages. Why do you need a "calculator"? Simply do as you are suggesting and divide the actual dimesion by the scale. I have scale rulers that help for smaller dimensions, but calculate the others as I need to.

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11. ### shortlinerMember

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Took some finding, but this may be just what you want
Shortliner(Jack)away up here in the Highlands
12. ### Sir_PrizeMember

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I remember someone doing a spreadsheet for Excel that would do the conversion.
Course... I could be think'n of another Forum.
I can see if I can find them tonight. They ain't big files, if ya' want and got Microsoft Excel I can e-mail'em to ya'.
13. ### Will_annandActive Member

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Here is a quick Excel Sheet with conversions between 3 scales.

Real World - HO - N

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16. ### cidchaseActive Member

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Hi Charles,
I think you just want to convert from real life to HO scale. Just use the calculator on your
computer if you don't have one. Here's an example:

Say the door you want to re-create in HO is 3'-0" x 6'-8".
The height is 80 inches, so enter 80 on your calculator.
Divide by 87.1 and you will get 0.91848............etc.

If you have a 6" decimal ruler then your door will be 0.92 inches tall,
or as close as you can measure it!

If you have a fractional ruler then multiply the 0.91848.......etc. on your
calculator by 32 and you will get 29.39.....etc.
Throw out the decimals and call your door 29/32" tall.

Now the width of the door is 36", so enter 36 on your calculator.
Divide by 87.1 and you will get 0.41331...........etc. Multiply
by 32 and you get 13.22...etc. Throw out the decimals and call
your door 13/32" wide. Or on your decimal ruler just measure close
as you can to 0.41".

So the basic steps are:
1. Figure or measure the real world lenghth in inches that you want to scale down.
2. On the calculator, divide that number by 87.1
3. You now have the decimal inches for your model. If you want it in 32nds,
just multiply by 32! Or if you want it in 16ths, just multiply by 16 instead.

The calculator does all the arithmetic for you, you can follow the same steps
for any "real life-to-HO" conversion.