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Scale Calculator See also: Measure at Scale From Image and Printable Scale Rulers

Calculate Scale
Scaled Length
Actual Length



Precision



Take a measurement from plan or on-screen image and enter it and the actual length it represents to calculate the scale. For an on-screen image, measure the known dimension of an object in the image (e.g. a wheel diameter).



Measure at Scale
Measured Length
Scale 1 :


Length
Measure at Scale From On-screen Image

Use a full scale ruler to measure a known measurement from an image on-screen. In the Calculate Scale dialog, enter this measurement into Scaled Length and the actual full scale measurement into Actual Length. Hit Calculate Scale to calculate the scale. Enter the scale into the lower Measure at Scale dialog. Now, measure any length from screen image or plan, enter into Measured Length and hit Calculate Length to calculate the actual full scale length.

Inch Fraction To Decimal Inch =

If scaling from an on-screen image, you can enlarge the image on the screen for more accurate measurements.
Hold down the CTRL key and hit + to enlarge, - to decrease size and 0 to re-set to 100% (normal).

Scaling Inch Fractions
If you're working at a small scale, and the calculators don't go small enough, you can scale up the measurements for the calculator inputs, then scale down the results. This is easy with Metric, where you can scale up by multiplying input dimensions by 10, enter into the calculator then scale the results back down by dividing by 10.
With Inch Fractions it's a bit more difficult to scale. Use this calculator to scale your Inch dimensions with Fractions up and down.


Scale : 1 Actual


Scaled at Scale =

See also: Measure at Scale From Image and Printable Scale Rulers

Try it out
From the image below, measure the front wheel rim diameter directly from your screen.
It's easier to measure if you place a sheet of paper on the screen, mark the dimension with a pen, then measure the dimension from the paper. Assuming the actual full size measurement of the rim is 18" or 457mm, enter the rim screen measurement into Scaled Length and the actual length (457) into Actual Length and hit Calculate Scale.
Hit Transfer Measure at Scale to transfer the scale to the lower Measure at Scale input dialog.
Now measure any dimension on the bike image and enter into Measured Length to calculate the actual full scale dimension.
If you're making a scale model, divide the full scale dimension by your model scale, to find dimensions for the parts on your model. (e.g. 10:1)

Size
Motorcycle
Scale :1


6:1 Motorcycle Scaled


If scaling from an on-screen image, you can enlarge the image on the screen for more accurate measurements.
Hold down the CTRL key and hit + to enlarge, - to decrease size and 0 to re-set to 100% (normal).




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If you need to take full scale measurements directly from your monitor, adjust the size of the diagrams on screen to match a ruler. Does not affect printed sizes. Use keyboard Cursor Keys to fine tune as you adjust scale.
Adjust scale of diagrams to measure 100% scale on screen with a ruler.

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All Inch inputs and dimensions are actual physical finished sizes
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Select output Fraction Precision then Re-Calculate to display.
Fraction Precision
Lumber
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Selected value is automatically copied to clipboard. Select then Paste into text box.
Prec…


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