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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 20 January 2008