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Copier percentages for converting between scales

We've all come across this problem, a book or magazine has a line drawing of the model you are making but it is in the wrong scale. This table will allow you convert it to the correct scale  using a photocopier

Read down the left column for the original scale, then across to the new scale. The magnification/enlargement factor is shown at the intersection.

Example: Copy from 1/72 (shown in green) to 1/35 (Red) result is 206% (Blue)  

Copier reduction/enlargement %
Original 
scale 1:

New Scale 1:
15 16 20 24 25 32 35 43 48 72 76 86 144
15 94 75 63 60 47 43 35 31 21 20 17 10
16 107 80 67 64 50 46 37 33 22 21 19 11
20 133 125 83 80 63 57 47 42 28 26 23 14
24 160 150 120 96 75 69 56 50 33 32 28 17
25 167 156 125 104 78 71 58 52 35 33 29 17
32 213 200 160 133 128 91 74 67 44 42 37 22
35 233 219 175 146 140 109 81 73 49 46 41 24
43 287 269 215 179 172 134 123 90 60 57 50 30
48 320 300 240 200 192 150 137 112 67 63 56 33
72 480 450 360 300 288 225 206 167 150 95 84 50
76 507 475 380 317 304 238 217 177 158 106 88 53
86 573 538 430 358 344 269 246 200 179 119 113 60
144 960 900 720 600 576 450 411 335 300 200 189 167

Many of these scales involve a larger magnification than is possible on the average office copier. In this case go via an intermediate scale first. e.g. to scale from 1/72 to 1/35 is an increase of 206%. Copy first to 1/48 (150%) then from 1/48 to 1/35 (137%)

Note that these conversions are ideals. Many copiers are not exact and some adjustment to these figures may be required. It is best to draw a scale on the original drawing and then adjust the copier to get the accurate dimension in the new scale.

Download this Scale conversion table as an Excel file, which also includes a table of conversions from imperial or metric measurements to popular scales.

You can also download a useful scale conversion program [Windows only]  which will convert from any dimension to any scale.

Last updated 29 April 2008

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