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 |