Conversion calculator

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

  1. KCS

    KCS Member

    Anyone know where I might find a good scale conversion calculator that I can download?
  2. MasonJar

    MasonJar It's not rocket surgery

    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....

  3. shortliner

    shortliner Member

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

    jim currie Active Member

    is this what you want?

    Attached Files:

  5. KCS

    KCS Member

    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. 60103

    60103 Pooh Bah

    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. 62cj5

    62cj5 New Member

    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. MasonJar

    MasonJar It's not rocket surgery

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


    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.

  9. ezdays

    ezdays Out AZ way

    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.
  10. shortliner

    shortliner Member

  11. shortliner

    shortliner Member

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

    Sir_Prize Member

    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_annand

    Will_annand Active Member

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

    Real World - HO - N

    Attached Files:

  14. 77railer

    77railer Member

  15. zedob

    zedob Member

  16. cidchase

    cidchase Active Member

    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.

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