I would like to know what the formula is to scale up or down your measurements?
For example, in 1/72nd what would the scale be for 292.0 mm?
Thank you.
Any scale:
Divide the real world measurement by the scale factor (72, 35, 24, 48, 96 350, 720 or whatever) to get the corresponding measurement on the model.
Multiply the model measurement with the sacel factor to get the corresponding size for the real world object.
If the real world object measures 292.0 mm the 1/72 scale object would have the measurement 292.0/72 = 4.0555… mm or 4.06 for practical purposes.
If you care about the thickness of paint then 4.05 or 4.04 would be about right before adding paint.
The 1/72nd scale with inches and feet can be calculated as 1/6th of an inch for every foot. A six foot guy would be 6 x 1/6th inch = 1 inch tall.
The 1/12, 1/24, 1/48, 1/96, 1/192 scales are even easier with imperial measurements:
1/12 : 1 foot = 1 inch
1/24 : 1 foot = ½ inch
1/48 : 1 foot = quarter inch
1/96 : 1 foot = one 8th inch
1/192 : 1 foot = one sixteenth
1/384 : 1 foot = one 32nd of an inch
Real world measurements that are not whole feet will be painful though …
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Is there a pocket-size calculator (ie. Texas Instruments) available for making such scaling calculations? 
Does this help or have I misunderstood the question?
Part of my brain refuses to engage with any figures whatsoever, so I always use this; there are others on the www.
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It appears that humanity can be divided into two groups,
those who can do division and those who will not.
A smaller sub-group are those who will do long division without
any tools whatsoever …
Any pocket calculator which has addition, subtraction, multiplication and division can be used to divide one number by another (divide x by 72) or
multiply two numbers (multiply y by 72).
Fguring out the scale displacement of a 1/72 scale tugboat when the 1/1 scale ship had a displacement of 300 to 400 long tons gets a bit more complicated.
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I always thought it was 10 groups - one that understands binary and one that doesn’t! 
Scaling up or down requires only an understanding of which way to go, and the calculator built into the OP’s computer. (Or indeed ANY computer with Windows installed…) Where it gets tricky is when the “real world” units are in inches, but the scale results need to be in millimetres.
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One inch = 25.4 millimetres
Inches and feet cause unnecessary problems …
I was under the impression that the scaling of areas and volumes caused the worst problems …
I now have no idea what anyone is talking about(!)
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That’s okay,
we like you anyway
Thank God for that!
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Here is a Html page that does it for you
Scale Model calculator
Scale Models NL- site
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Yep, most Walgreens, CVS, or Rite Aids have them. However your phone should be able to do this with the calculator function.
1/72 means,
1 is the size of 1 real world foot
The / symbol means divide the foot by what scale you are trying to use.
72 means you would divide 1 by 72 to get what 1 foot would be in the 72nd scale.
so 1/72 =.0138 that means 1 foot at 1/72nd scale equals .0138 of a real world foot.
So, in 172nd scale, how long is 10 feet?
.0138 X 10 = .138 of a foot
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whast is all these inches and feet things. does the world not use Metres and Centimetres now, or have we regressed back to the dark ages?
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which is approximately the visible length of the big toe on a US size 11 foot (UK size 19, EU size 45)
joking aside. i’ve got an excel spreadsheet that can do all the various conversions, not sure how to upload it here though, screenshot for reference
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The Olde English-speaking world is still obsessed with a measuring system based on the length of the outer end of the King’s thumb! We can only hope each successive king has the same thumb…
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Actually scaling of area and volume is pretty simple. Taking the example of a 1/72 tugboat at 350 tons displacement,
Take the displacement and divide by the scale. Divide the result by the scale and again. Multiply by 1000 for model weight in Kg or 2240 for model weight in pounds
350/72=4.8611111/72=0.0675/72=0.0009377*1000=0.9377kg (938g) or 2.1lbs (33.6oz)
Simples!
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“have we regressed back to the dark ages?”
Maybe. Most of the world uses Metric/Centigrade. AFAIK, only the US still uses inches, miles, Fahrenheit. etc.
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