Drill Bit Sizes

This drill size chart provides a list of all standard drill bit sizes in common measurement systems...

Standard metric drill bit sizes Fractional inch drill bit Wire gauge drill bit sizes Letter size

Drill size	Diameter (in)	Diameter (mm)
#1	0.228	5.7912
#2	0.221	5.6134
#3	0.213	5.4102
#4	0.209	5.3086
#5	0.2055	5.2197
#6	0.204	5.1816
#7	0.201	5.1054
#8	0.199	5.0546
#9	0.196	4.9784
#10	0.1935	4.9149
#11	0.191	4.8514
#12	0.189	4.8006
#13	0.185	4.699
#14	0.182	4.6228
#15	0.18	4.572
#16	0.177	4.4958
#17	0.173	4.3942
#18	0.1695	4.3053
#19	0.166	4.2164
#20	0.161	4.0894
#21	0.159	4.0386
#22	0.157	3.9878
#23	0.154	3.9116
#24	0.152	3.8608
#25	0.1495	3.7973
#26	0.147	3.7338
#27	0.144	3.6576
#28	0.1405	3.5687
#29	0.136	3.4544
#30	0.1285	3.2639
#31	0.12	3.048
#32	0.116	2.9464
#33	0.113	2.8702
#34	0.111	2.8194
#35	0.11	2.794
#36	0.1065	2.7051
#37	0.104	2.6416
#38	0.1015	2.5781
#39	0.0995	2.5273
#40	0.098	2.4892
#41	0.096	2.4384
#42	0.0935	2.3749
#43	0.089	2.2606
#44	0.086	2.1844
#45	0.082	2.0828
#46	0.081	2.0574
#47	0.0785	1.9939
#48	0.076	1.9304
#49	0.073	1.8542
#50	0.07	1.778
#51	0.067	1.7018
#52	0.0635	1.6129
#53	0.0595	1.5113
#54	0.055	1.397
#55	0.052	1.3208
#56	0.0465	1.1811
#57	0.043	1.0922
#58	0.042	1.0668
#59	0.041	1.0414
#60	0.04	1.016
#61	0.039	0.9906
#62	0.038	0.9652
#63	0.037	0.9398
#64	0.036	0.9144
#65	0.035	0.889
#66	0.033	0.8382
#67	0.032	0.8128
#68	0.031	0.7874
#69	0.0292	0.7417
#70	0.028	0.7112
#71	0.026	0.6604
#72	0.025	0.635
#73	0.024	0.6096
#74	0.0225	0.5715
#75	0.021	0.5334
#76	0.02	0.508
#77	0.018	0.4572
#78	0.016	0.4064
#79	0.0145	0.368
#80	0.0135	0.3429
#81	0.013	0.3302
#82	0.0125	0.3175
#83	0.012	0.3048
#84	0.0115	0.2921
#85	0.011	0.2794
#86	0.0105	0.2667
#87	0.01	0.254
#88	0.0095	0.2413
#89	0.0091	0.2311
#90	0.0087	0.221
#91	0.0083	0.2108
#92	0.0079	0.2007
#93	0.0075	0.1905
#94	0.0071	0.1803
#95	0.0067	0.1702
#96	0.0063	0.16
#97	0.0059	0.1499
#98	0.0055	0.1397
#99	0.0051	0.1295
#100	0.0047	0.1194
#101	0.0043	0.1092
#102	0.0039	0.0991
#103	0.0035	0.0889
#104	0.0031	0.0787
#105	0.0027	0.0686
#106	0.0023	0.0584
#107	0.0019	0.0483
9.5 mm	0.374
9.6 mm	0.378
9.7 mm	0.3819
9.8 mm	0.3858
9.9 mm	0.3898
10 mm	0.3937
10.5 mm	0.4134
11 mm	0.4331
11.5 mm	0.4528
12 mm	0.4724
12.5 mm	0.4921
13 mm	0.5118
13.5 mm	0.5315
14 mm	0.5512
14.5 mm	0.5709
15 mm	0.5906
15.5 mm	0.6102
16 mm	0.6299
16.5 mm	0.6496
17 mm	0.6693
17.5 mm	0.689
18 mm	0.7087
18.5 mm	0.7284
19 mm	0.748
19.5 mm	0.7677
20 mm	0.7874
20.5 mm	0.8071
21 mm	0.8268
21.5 mm	0.8465
22 mm	0.8661
22.5 mm	0.8858
23 mm	0.9055
23.5 mm	0.9252
24 mm	0.9449
24.5 mm	0.9646
25 mm	0.9843
25.5 mm	1.0039
26 mm	1.0236
26.5 mm	1.0433
27 mm	1.063
27.5 mm	1.0827
28 mm	1.1024
28.5 mm	1.1221
29 mm	1.1417
29.5 mm	1.1614
30 mm	1.1811
30.5 mm	1.2008
31 mm	1.2205
31.5 mm	1.2402
32 mm	1.2598
32.5 mm	1.2795
33 mm	1.2992
33.5 mm	1.3189
34 mm	1.3386
34.5 mm	1.3583
35 mm	1.378
35.5 mm	1.3976
36 mm	1.4173
36.5 mm	1.437
37 mm	1.4567
37.5 mm	1.4764
38 mm	1.4961
3/4 in	0.75	19.05
3/8 in	0.375	9.525
3/16 in	0.1875	4.7625
3/32 in	0.0938	2.3813
3/64 in	0.0469	1.1906
11/16 in	0.6875	17.4625
11/32 in	0.3438	8.7313
11/64 in	0.1719	4.3656
13/16 in	0.8125	20.6375
13/32 in	0.4063	10.3188
13/64 in	0.2031	5.1594
15/16 in	0.9375	23.8125
15/32 in	0.4688	11.9063
15/64 in	0.2344	5.9531
17/32 in	0.5313	13.4938
17/64 in	0.2656	6.7469
19/32 in	0.5938	15.0813
19/64 in	0.2969	7.5406
21/23 in	0.913	23.1913
21/64 in	0.3281	8.3344
23/32 in	0.7188	18.2563
23/64 in	0.3594	9.1281
25/32 in	0.7813	19.8438
25/64 in	0.3906	9.9219
27/32 in	0.8438	21.4313
27/64 in	0.4219	10.7156
29/32 in	0.9063	23.0188
29/64 in	0.4531	11.5094
31/32 in	0.9688	24.6063
31/64 in	0.4844	12.3031
33/64 in	0.5156	13.0969
35/64 in	0.5469	13.8906
37/64 in	0.5781	14.6844
39/64 in	0.6094	15.4781
41/64 in	0.6406	16.2719
43/64 in	0.6719	17.0656
45/64 in	0.7031	17.8594
47/64 in	0.7344	18.6531
49/64 in	0.7656	19.4469
5/16 in	0.3125	7.9375
5/32 in	0.1563	3.9688
5/64 in	0.0781	1.9844
5/8 in	0.625	15.875
51/64 in	0.7969	20.2406
53/64 in	0.8281	21.0344
55/64 in	0.8594	21.8281
57/64 in	0.8906	22.6219
59/64 in	0.9219	23.4156
61/64 in	0.9531	24.2094
63/64 in	0.9844	25.0031
7/16 in	0.4375	11.1125
7/32 in	0.2188	5.5563
7/64 in	0.1094	2.7781
7/8 in	0.875	22.225
9/16 in	0.5625	14.2875
9/32 in	0.2813	7.1438
9/64 in	0.1406	3.5719
A	0.234	5.9436
B	0.238	6.0452
C	0.242	6.1468
D	0.246	6.2484
E	0.25	6.35
F	0.257	6.5278
G	0.261	6.6294
H	0.266	6.7564
I	0.272	6.9088
J	0.277	7.0358
K	0.281	7.1374
L	0.29	7.366
M	0.295	7.493
N	0.302	7.6708
O	0.316	8.0264
P	0.323	8.2042
Q	0.332	8.4328
R	0.339	8.6106
S	0.348	8.8392
T	0.358	9.0932
U	0.368	9.3472
V	0.377	9.5758
W	0.386	9.8044
X	0.397	10.0838
Y	0.404	10.2616
Z	0.413	10.4902