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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