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Scale Spreadsheet By: Tim Doty

I made up this spreadsheet as a reference for scale size conversions and for sizing certain parts. Just find the 1:1 size you are looking for, and the scale equivalent is shown in inches and millimeters. Converting from one scale to another is a matter of finding the actual measurement in the scale you are working with, and find those same numbers (or as close as possible) under a different scale. This explanation is probably harder to use than the actual table.

1/27th scale is included for the Maisto (among others) diecasts whose parts might be useful for 1/24-1/25th scale projects. Or, you might even want to detail one of the 1/27th vehicles.


1:1 1/16 1/18 1/24 1/25 1/27 1/32 1/35 1/43 1:1
units =   inches     mm   inches     mm   inches     mm   inches     mm   inches     mm   inches     mm   inches     mm   inches     mm decimal
1/16 0.0039 0.0992 0.0035 0.0882 0.0026 0.0661 0.0025 0.0635 0.0023 0.0588 0.0020 0.0496 0.0017 0.0441 0.0015 0.0369 0.0625
1/8 0.0078 0.1984 0.0069 0.1764 0.0052 0.1323 0.0050 0.1270 0.0046 0.1176 0.0039 0.0992 0.0035 0.0882 0.0029 0.0738 0.1250
3/16 0.0117 0.2977 0.0104 0.2646 0.0078 0.1984 0.0075 0.1905 0.0069 0.1764 0.0059 0.1488 0.0052 0.1323 0.0044 0.1108 0.1875
1/4 0.0156 0.3969 0.0139 0.3528 0.0104 0.2646 0.0100 0.2540 0.0093 0.2352 0.0078 0.1984 0.0069 0.1764 0.0058 0.1477 0.2500
5/16 0.0195 0.4961 0.0174 0.4410 0.0130 0.3307 0.0125 0.3175 0.0116 0.2940 0.0098 0.2480 0.0087 0.2205 0.0073 0.1846 0.3125
3/8 0.0234 0.5953 0.0208 0.5292 0.0156 0.3969 0.0150 0.3810 0.0139 0.3528 0.0117 0.2977 0.0104 0.2646 0.0087 0.2215 0.3750
7/16 0.0273 0.6945 0.0243 0.6174 0.0182 0.4630 0.0175 0.4445 0.0162 0.4116 0.0137 0.3473 0.0122 0.3087 0.0102 0.2584 0.4375
1/2 0.0313 0.7938 0.0278 0.7056 0.0208 0.5292 0.0200 0.5080 0.0185 0.4704 0.0156 0.3969 0.0139 0.3528 0.0116 0.2953 0.5000
9/16 0.0352 0.8930 0.0313 0.7938 0.0234 0.5953 0.0225 0.5715 0.0208 0.5292 0.0176 0.4465 0.0156 0.3969 0.0131 0.3323 0.5625
5/8 0.0391 0.9922 0.0347 0.8819 0.0260 0.6615 0.0250 0.6350 0.0231 0.5880 0.0195 0.4961 0.0174 0.4410 0.0145 0.3692 0.6250
11/16 0.0430 1.0914 0.0382 0.9701 0.0286 0.7276 0.0275 0.6985 0.0255 0.6468 0.0215 0.5457 0.0191 0.4851 0.0160 0.4061 0.6875
3/4 0.0469 1.1906 0.0417 1.0583 0.0313 0.7938 0.0300 0.7620 0.0278 0.7056 0.0234 0.5953 0.0208 0.5292 0.0174 0.4430 0.750
13/16 0.0508 1.2898 0.0451 1.1465 0.0339 0.8599 0.0325 0.8255 0.0301 0.7644 0.0254 0.6449 0.0226 0.5733 0.0189 0.4799 0.8125
7/8 0.0547 1.3891 0.0486 1.2347 0.0365 0.9260 0.0350 0.8890 0.0324 0.8231 0.0273 0.6945 0.0243 0.6174 0.0203 0.5169 0.875
15/16 0.0586 1.4883 0.0521 1.3229 0.0391 0.9922 0.0375 0.9525 0.0347 0.8819 0.0293 0.7441 0.0260 0.6615 0.0218 0.5538 0.9375
1 0.0625 1.5875 0.0556 1.4111 0.0417 1.0583 0.0400 1.0160 0.0370 0.9407 0.0313 0.7938 0.0278 0.7056 0.0233 0.5907 1.00
1 1/8 0.0703 1.7859 0.0625 1.5875 0.0469 1.1906 0.0450 1.1430 0.0417 1.0583 0.0352 0.8930 0.0313 0.7938 0.0262 0.6645 1.125
1 1/4 0.0781 1.9844 0.0694 1.7639 0.0521 1.3229 0.0500 1.2700 0.0463 1.1759 0.0391 0.9922 0.0347 0.8819 0.0291 0.7384 1.25
1 3/8 0.0859 2.1828 0.0764 1.9403 0.0573 1.4552 0.0550 1.3970 0.0509 1.2935 0.0430 1.0914 0.0382 0.9701 0.0320 0.8122 1.375
1 1/2 0.0938 2.3813 0.0833 2.1167 0.0625 1.5875 0.0600 1.5240 0.0556 1.4111 0.0469 1.1906 0.0417 1.0583 0.0349 0.8860 1.50
1 3/4 0.1094 2.7781 0.0972 2.4694 0.0729 1.8521 0.0700 1.7780 0.0648 1.6463 0.0547 1.3891 0.0486 1.2347 0.0407 1.0337 1.75
2 0.1250 3.1750 0.1111 2.8222 0.0833 2.1167 0.0800 2.0320 0.0741 1.8815 0.0625 1.5875 0.0556 1.4111 0.0465 1.1814 2.00
2 1/8 0.1328 3.3734 0.1181 2.9986 0.0885 2.2490 0.0850 2.1590 0.0787 1.9991 0.0664 1.6867 0.0590 1.4993 0.0494 1.2552 2.125
2 1/4 0.1406 3.5719 0.1250 3.1750 0.0938 2.3813 0.0900 2.2860 0.0833 2.1167 0.0703 1.7859 0.0625 1.5875 0.0523 1.3291 2.25
2 1/2 0.1563 3.9688 0.1389 3.5278 0.1042 2.6458 0.1000 2.5400 0.0926 2.3519 0.0781 1.9844 0.0694 1.7639 0.0581 1.4767 2.50
2 3/4 0.1719 4.3656 0.1528 3.8806 0.1146 2.9104 0.1100 2.7940 0.1019 2.5870 0.0859 2.1828 0.0764 1.9403 0.0640 1.6244 2.75
3 0.1875 4.7625 0.1667 4.2333 0.1250 3.1750 0.1200 3.0480 0.1111 2.8222 0.0938 2.3813 0.0833 2.1167 0.0698 1.7721 3.00
4 0.2500 6.3500 0.2222 5.6444 0.1667 4.2333 0.1600 4.0640 0.1481 3.7630 0.1250 3.1750 0.1111 2.8222 0.0930 2.3628 4.00
5 0.3125 7.9375 0.2778 7.0556 0.2083 5.2917 0.2000 5.0800 0.1852 4.7037 0.1563 3.9688 0.1389 3.5278 0.1163 2.9535 5.00
6 0.3750 9.5250 0.3333 8.4667 0.2500 6.3500 0.2400 6.0960 0.2222 5.6444 0.1875 4.7625 0.1667 4.2333 0.1395 3.5442 6.00
7 0.4375 11.1125 0.3889 9.8778 0.2917 7.4083 0.2800 7.1120 0.2593 6.5852 0.2188 5.5563 0.1944 4.9389 0.1628 4.1349 7.00
8 0.5000 12.7000 0.4444 11.2889 0.3333 8.4667 0.3200 8.1280 0.2963 7.5259 0.2500 6.3500 0.2222 5.6444 0.1860 4.7256 8.00
10 0.6250 15.8750 0.5556 14.1111 0.4167 10.5833 0.4000 10.1600 0.3704 9.4074 0.3125 7.9375 0.2778 7.0556 0.2326 5.9070 10.00
13 0.8125 20.6375 0.7222 18.3444 0.5417 13.7583 0.5200 13.2080 0.4815 12.2296 0.4063 10.3188 0.3611 9.1722 0.3023 7.6791 13.00
14 0.8750 22.2250 0.7778 19.7556 0.5833 14.8167 0.5600 14.2240 0.5185 13.1704 0.4375 11.1125 0.3889 9.8778 0.3256 8.2698 14.00
15 0.9375 23.8125 0.8333 21.1667 0.6250 15.8750 0.6000 15.2400 0.5556 14.1111 0.4688 11.9063 0.4167 10.5833 0.3488 8.8605 15.00
16 1.0000 25.4000 0.8889 22.5778 0.6667 16.9333 0.6400 16.2560 0.5926 15.0519 0.5000 12.7000 0.4444 11.2889 0.3721 9.4512 16.00
17 1.0625 26.9875 0.9444 23.9889 0.7083 17.9917 0.6800 17.2720 0.6296 15.9926 0.5313 13.4938 0.4722 11.9944 0.3953 10.0419 17.00
18 1.1250 28.5750 1.0000 25.4000 0.7500 19.0500 0.7200 18.2880 0.6667 16.9333 0.5625 14.2875 0.5000 12.7000 0.4186 10.6326 18.00
19 1.1875 30.1625 1.0556 26.8111 0.7917 20.1083 0.7600 19.3040 0.7037 17.8741 0.5938 15.0813 0.5278 13.4056 0.4419 11.2233 19.00
20 1.2500 31.7500 1.1111 28.2222 0.8333 21.1667 0.8000 20.3200 0.7407 18.8148 0.6250 15.8750 0.5556 14.1111 0.4651 11.8140 20.00
21 1.3125 33.3375 1.1667 29.6333 0.8750 22.2250 0.8400 21.3360 0.7778 19.7556 0.6563 16.6688 0.5833 14.8167 0.4884 12.4047 21.00
22 1.3750 34.9250 1.2222 31.0444 0.9167 23.2833 0.8800 22.3520 0.8148 20.6963 0.6875 17.4625 0.6111 15.5222 0.5116 12.9953 22.00
24 1.5000 38.1000 1.3333 33.8667 1.0000 25.4000 0.9600 24.3840 0.8889 22.5778 0.7500 19.0500 0.6667 16.9333 0.5581 14.1767 24.00
26 1.6250 41.2750 1.4444 36.6889 1.0833 27.5167 1.0400 26.4160 0.9630 24.4593 0.8125 20.6375 0.7222 18.3444 0.6047 15.3581 26.00
units =   inches     mm   inches     mm   inches     mm   inches     mm   inches     mm   inches     mm   inches     mm   inches     mm decimal
1:1 1/16 1/18 1/24 1/25 1/27 1/32 1/35 1/43 1:1