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A B
1
 Drill Size Decimal
2
 1/64" 0.0156
3
 0.5mm 0.0197
4
 1/32" 0.0312
5
 1mm 0.0394
6
 60 0.0400
7
 59 0.0410
8
 58 0.0420
9
 57 0.0430
10
 56 0.0465
11
 3/64" 0.0469
12
 55 0.0520
13
 54 0.0550
14
 1.5mm 0.0591
15
 53 0.0595
16
 1/16" 0.0625
17
 52 0.0635
18
 51 0.0670
19
 50 0.0700
20
 49 0.0730
21
 48 0.0760
22
 5/64" 0.0781
23
 47 0.0785
24
 2mm 0.0787
25
 46 0.0810
26
 45 0.0820
27
 44 0.0860
28
 43 0.0890
29
 42 0.0935
30
 3/32" 0.0938
31
 41 0.0960
32
 40 0.0980
33
 2.5mm 0.0984
34
 39 0.0995
35
 38 0.1015
36
 37 0.1040
37
 36 0.1065
38
 7/64" 0.1094
39
 35 0.1100
40
 34 0.1110
41
 33 0.1130
42
 32 0.1160
43
 3mm 0.1181
44
 31 0.1200
45
 1/8" 0.1250
46
 30 0.1285
47
 29 0.1360
48
 3.5mm 0.1378
49
 28 0.1405
50
 9/64" 0.1406
51
 27 0.1440
52
 26 0.1470
53
 25 0.1495
54
 24 0.1520
55
 23 0.1540
56
 5/32" 0.1562
57
 22 0.1570
58
 4mm 0.1575
59
 21 0.1590
60
 20 0.1610
61
 19 0.1660
62
 18 0.1695
63
 11/64" 0.1719
64
 17 0.1730
65
 16 0.1770
66
 4.5mm 0.1772
67
 15 0.1800
68
 14 0.1820
69
 13 0.1850
70
 3/16" 0.1875
71
 12 0.1890
72
 11 0.1910
73
 10 0.1935
74
 9 0.1960
75
 5mm 0.1969
76
 8 0.1990
77
 7 0.2010
78
 13/64" 0.2031
79
 6 0.2040
80
 5 0.2055
81
 4 0.2090
82
 3 0.2130
83
 5.5mm 0.2165
84
 7/32" 0.2188
85
 2 0.2210
86
 1 0.2280
87
 A 0.2340
88
 15/64" 0.2344
89
 6mm 0.2362
90
 B 0.2380
91
 C 0.2420
92
 D 0.2460
93
 1/4" & E 0.2500
94
 6.5mm 0.2559
95
 F 0.2570
96
 G 0.2610
97
 17/64" 0.2656
98
 H 0.2260
99
 I 0.2720
100
 7mm 0.2756
101
 J 0.2770
102
 K 0.2810
103
 9/32" 0.2812
104
 L 0.2900
105
 M 0.2950
106
 7.5mm 0.2953
107
 19/64" 0.2969
108
 N 0.3020
109
 5/16" 0.3125
110
 8mm 0.3150
111
 O 0.3160
112
 P 0.3230
113
 21/64" 0.3281
114
 Q 0.3320
115
 8.5mm 0.3346
116
 R 0.3390
117
 11/32" 0.3438
118
 S 0.3480
119
 9mm 0.3543
120
 T 0.3580
121
 23/64" 0.3594
122
 U 0.3680
123
 9.5mm 0.3740
124
 3/8" 0.3750
125
 V 0.3770
126
 W 0.3860
127
 25/64" 0.3906
128
 10mm 0.3937
129
 X 0.3970
130
 Y 0.4040
131
 13/32" 0.4062
132
 Z 0.4130
133
 10.5mm 0.4134
134
 27/64" 0.4219
135
 11mm 0.4331
136
 7/16" 0.4375
137
 11.5mm 0.4528
138
 29/64" 0.4531
139
 15/32" 0.4688
140
 12mm 0.4724
141
 31/64" 0.4844
142
 12.5mm 0.4921
143
 1/2" 0.5000
144
 13mm 0.5118
145
 33/64" 0.5156
146
 17/32" 0.5313
147
 13.5mm 0.5315
148
 35/64" 0.5469
149
 14mm 0.5512
150
 9/16" 0.5625
151
 14.5mm 0.5709
152
 37/64" 0.5781
153
 15mm 0.5906
154
 19/32" 0.5938
155
 39/64" 0.6094
156
 15.5mm 0.6102
157
 5/8" 0.6250
158
 16mm 0.6299
159
 41/64" 0.6406
160
 16.5mm 0.6496
161
 21/32" 0.6562
162
 17mm 0.6693
163
 43/64" 0.6719
164
 11/16" 0.6875
165
 17.5mm 0.6890
166
 45/64" 0.7031
167
 18mm 0.7087
168
 23/32" 0.7188
169
 18.5mm 0.7283
170
 47/64" 0.7344
171
 19mm 0.7480
172
 3/4" 0.7500
173
 49/64" 0.7656
174
 19.5mm 0.7677
175
 25/32" 0.7812
176
 20mm 0.7874
177
 51/64" 0.7969
178
 20.5mm 0.8071
179
 13/16" 0.8125
180
 21mm 0.8268
181
 53/64" 0.8281
182
 27/32" 0.8438
183
 21.5mm 0.8465
184
 55/64" 0.8594
185
 22mm 0.8661
186
 7/8" 0.8750
187
 22.5mm 0.8858
188
 57/64" 0.8906
189
 23mm 0.9055
190
 29/32" 0.9062
191
 59/64" 0.9219
192
 23.5mm 0.9252
193
 15/16" 0.9375
194
 24mm 0.9449
195
 61/64" 0.9531
196
 24.5mm 0.9646
197
 31/32" 0.9688
198
 25mm 0.9843
199
 63/64" 0.9844
200
 1" 1.0000