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We hope that this drill size conversion chart will be of use to
some modellers. Should you spot an error in the figures, please let us
know.
Fract.
(in) |
Decimal |
Wire No.
/Letter |
Metric
(mm) |
|
Fract.
(in) |
Decimal |
Wire No.
/Letter |
Metric
(mm) |
|
Fract
(in) |
Decimal |
Wire No.
/Letter |
Metric
(mm) |
|
| | 0.0098 | |
0.25 |
| 0.1065 | 36 | |
| 0.3480 | S | |
| | 0.0118 | |
0.30 |
7/64 | 0.1094 | | |
| 0.3543 | |
9.00 |
| | 0.0135 | 80 | |
| 0.1100 | 35 | |
| 0.3580 | T | |
| | 0.0138 | |
0.35 |
| 0.1102 | |
2.80 |
23/64 | 0.3594 | | |
| | 0.0145 | 79 | |
| 0.1110 | 34 | |
| 0.3680 | U | |
| 1/64 | 0.0156 | | |
| 0.1130 | 33 | |
| 0.3740 | |
9.50 |
| | 0.0157 | |
0.40 |
| 0.1142 | |
2.90 |
3/8 | 0.3750 | | |
| | 0.0160 | 78 | |
| 0.1160 | 32 | |
| 0.3770 | V | |
| | 0.0177 | |
0.45 |
| 0.1181 | |
3.00 |
| 0.3860 | W | |
| | 0.0180 | 77 | |
| 0.1200 | 31 | |
25/64 | 0.3906 | | |
| | 0.0197 | |
0.50 |
1/8 | 0.1250 | | |
| 0.3937 | |
10.00 |
| | 0.0200 | 76 | |
| 0.1285 | 30 | |
| 0.3970 | X | |
| | 0.0210 | 75 | |
| 0.1360 | 29 | |
| 0.4040 | Y | |
| | 0.0217 | |
0.55 |
| 0.1378 | |
3.50 |
13/32 | 0.4063 | | |
| | 0.0225 | 74 | |
| 0.1405 | 28 | |
| 0.4130 | Z | |
| | 0.0236 | |
0.60 |
9/64 | 0.1406 | | |
| 0.4134 | |
10.50 |
| | 0.0240 | 73 | |
| 0.1440 | 27 | |
27/64 | 0.4219 | | |
| | 0.0250 | 72 | |
| 0.1470 | 26 | |
| 0.4331 | |
11.00 |
| | 0.0256 | |
0.65 |
| 0.1495 | 25 | |
7/16 | 0.4375 | | |
| | 0.0260 | 71 | |
| 0.1520 | 24 | |
| 0.4528 | |
11.50 |
| | 0.0276 | |
0.70 |
| 0.1540 | 23 | |
29/64 | 0.4531 | | |
| | 0.0280 | 70 | |
5/32 | 0.1563 | | |
15/32 | 0.4688 | | |
| | 0.0292 | 69 | |
| 0.1570 | 22 | |
| 0.4724 | |
12.00 |
| | 0.0295 | |
0.75 |
| 0.1575 | |
4.00 |
31/64 | 0.4844 | | |
| | 0.0310 | 68 | |
| 0.1590 | 21 | |
| 0.4921 | |
12.50 |
| 1/32 | 0.0313 | | |
| 0.1610 | 20 | |
1/2 | 0.5000 | | |
| | 0.0315 | |
0.80 |
| 0.1660 | 19 | |
| 0.5118 | |
13.00 |
| | 0.0320 | 67 | |
| 0.1695 | 18 | |
33/64 | 0.5156 | | |
| | 0.0330 | 66 | |
11/64 | 0.1719 | | |
17/32 | 0.5313 | | |
| | 0.0335 | |
0.85 |
| 0.1730 | 17 | |
| 0.5315 | |
13.50 |
| | 0.0350 | 65 | |
| 0.1770 | 16 | |
35/64 | 0.5469 | | |
| | 0.0354 | |
0.90 |
| 0.1772 | |
4.50 |
| 0.5512 | |
14.00 |
| | 0.0360 | 64 | |
| 0.1800 | 15 | |
9/16 | 0.5625 | | |
| | 0.0370 | 63 | |
| 0.1820 | 14 | |
| 0.5709 | |
14.50 |
| | 0.0374 | |
0.95 |
| 0.1850 | 13 | |
37/64 | 0.5781 | | |
| | 0.0380 | 62 | |
3/16 | 0.1875 | | |
| 0.5905 | |
15.00 |
| | 0.0390 | 61 | |
| 0.1890 | 12 | |
19/32 | 0.5938 | | |
| | 0.0394 | |
1.00 |
| 0.1910 | 11 | |
39/64 | 0.6094 | | |
| | 0.0400 | 60 | |
| 0.1935 | 10 | |
| 0.6102 | |
15.50 |
| | 0.0410 | 59 | |
| 0.1960 | 9 | |
5/8 | 0.6250 | | |
| | 0.0420 | 58 | |
| 0.1968 | |
5.00 |
| 0.6299 | |
16.00 |
| | 0.0430 | 57 | |
| 0.1990 | 8 | |
41/64 | 0.6406 | | |
| | 0.0433 | |
1.10 |
| 0.2010 | 7 | |
| 0.6496 | |
16.50 |
| | 0.0465 | 56 | |
13/64 | 0.2031 | | |
21/32 | 0.6563 | | |
| 3/64 | 0.0469 | | |
| 0.2040 | 6 | |
| 0.6693 | |
17.00 |
| | 0.0472 | |
1.20 |
| 0.2055 | 5 | |
43/64 | 0.6719 | | |
| | 0.0512 | |
1.30 |
| 0.2090 | 4 | |
11/16 | 0.6875 | | |
| | 0.0520 | 55 | |
| 0.2130 | 3 | |
| 0.6890 | |
17.50 |
| | 0.0550 | 54 | |
| 0.2165 | |
5.50 |
45/64 | 0.7031 | | |
| | 0.0551 | |
1.40 |
7/32 | 0.2188 | | |
| 0.7087 | |
18.00 |
| | 0.0591 | |
1.50 |
| 0.2210 | 2 | |
23/32 | 0.7188 | | |
| | 0.0595 | 53 | |
| 0.2280 | 1 | |
| 0.7283 | |
18.50 |
| 1/16 | 0.0625 | | |
| 0.2340 | A | |
47/64 | 0.7344 | | |
| | 0.0630 | |
1.60 |
15/64 | 0.2344 | | |
| 0.7480 | |
19.00 |
| | 0.0635 | 52 | |
| 0.2362 | |
6.00 |
3/4 | 0.7500 | | |
| | 0.0669 | |
1.70 |
| 0.2380 | B | |
49/64 | 0.7656 | | |
| | 0.0670 | 51 | |
| 0.2420 | C | |
| 0.7677 | |
19.50 |
| | 0.0700 | 50 | |
| 0.2460 | D | |
25/32 | 0.7813 | | |
| | 0.0709 | |
1.80 |
1/4 | 0.2500 |
E | |
| 0.7874 | |
20.00 |
| | 0.0730 | 49 | |
| 0.2559 | |
6.50 |
51/64 | 0.7969 | | |
| | 0.0748 | |
1.90 |
| 0.2570 | F | |
| 0.8071 | |
20.50 |
| | 0.0760 | 48 | |
| 0.2610 | G | |
13/16 | 0.8125 | | |
| 5/64 | 0.0781 | | |
17/64 | 0.2656 | | |
| 0.8268 | |
21.00 |
| | 0.0785 | 47 | |
| 0.2660 | H | |
53/64 | 0.8281 | | |
| | 0.0787 | |
2.00 |
| 0.2720 | I | |
27/32 | 0.8438 | | |
| | 0.0810 | 46 | |
| 0.2756 | |
7.00 |
| 0.8465 | |
21.50 |
| | 0.0820 | 45 | |
| 0.2770 | J | |
55/64 | 0.8594 | | |
| | 0.0827 | |
2.10 |
| 0.2810 | K | |
| 0.8661 | |
22.00 |
| | 0.0860 | 44 | |
9/32 | 0.2813 | | |
7/8 | 0.8750 | | |
| | 0.0866 | |
2.20 |
| 0.2900 | L | |
| 0.8858 | |
22.50 |
| | 0.0890 | 43 | |
| 0.2950 | M | |
57/64 | 0.8906 | | |
| | 0.0906 | |
2.30 |
| 0.2953 | |
7.50 |
| 0.9055 | |
23.00 |
| | 0.0935 | 42 | |
19/64 | 0.2969 | | |
29/32 | 0.9063 | | |
| 3/32 | 0.0938 | | |
| 0.3020 | N | |
59/64 | 0.9219 | | |
| | 0.0945 | |
2.40 |
5/16 | 0.3125 | | |
| 0.9252 | |
23.50 |
| | 0.0960 | 41 | |
| 0.3150 | |
8.00 |
15/16 | 0.9375 | | |
| | 0.0980 | 40 | |
| 0.3160 | O | |
| 0.9449 | |
24.00 |
| | 0.0984 | |
2.50 |
| 0.3230 | P | |
61/64 | 0.9531 | | |
| | 0.0995 | 39 | |
21/64 | 0.3281 | | |
| 0.9646 | |
24.50 |
| | 0.1015 | 38 | |
| 0.3320 | Q | |
31/32 | 0.9688 | | |
| | 0.1024 | |
2.60 |
| 0.3346 | |
8.50 |
| 0.9842 | |
25.00 |
| | 0.1040 | 37 | |
| 0.3390 | R | |
63/64 | 0.9844 | | |
| | 0.1063 | |
2.70 |
11/32 | 0.3438 | | |
1 | 1.0000 | | |
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