Directory Metric or Imperial



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

Calculate Scale
Scaled Length
Actual Length



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 (eg: a wheel diameter)





Measure at Scale
Measured Length
Scale 1 :

Measured 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 Measured Length and the actual full scale measurement into Full Scale 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 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 Imperial 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 Imperial (inch) Fractions it's a bit more difficult to scale. Use this calculator to scale your Imperial dimensions with Fractions up and down.

Scale : 1 Actual



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All calculators on this site are geometric only.
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