Drill Bit Charts – Fraction, Metric, Letter & Wire Gauge

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FRACTION DRILL SIZES
Drill size	Diameter (in)	Diameter (mm)
1/64 in	0.0156	0.3969
1/32 in	0.0313	0.7938
3/64 in	0.0469	1.1906
1/16 in	0.0625	1.5875
5/64 in	0.0781	1.9844
3/32 in	0.0938	2.3813
7/64 in	0.1094	2.7781
1/8 in	0.125	3.175
9/64 in	0.1406	3.5719
5/32 in	0.1563	3.9688
11/64 in	0.1719	4.3656
3/16 in	0.1875	4.7625
13/64 in	0.2031	5.1594
7/32 in	0.2188	5.5563
15/64 in	0.2344	5.9531
1/4 in	0.25	6.35
17/64 in	0.2656	6.7469
9/32 in	0.2813	7.1438
19/64 in	0.2969	7.5406
5/16 in	0.3125	7.9375
21/64 in	0.3281	8.3344
11/32 in	0.3438	8.7313
23/64 in	0.3594	9.1281
3/8 in	0.375	9.525
25/64 in	0.3906	9.9219
13/32 in	0.4063	10.3188
27/64 in	0.4219	10.7156
7/16 in	0.4375	11.1125
29/64 in	0.4531	11.5094
15/32 in	0.4688	11.9063
31/64 in	0.4844	12.3031
1/2 in	0.5	12.7
33/64 in	0.5156	13.0969
17/32 in	0.5313	13.4938
35/64 in	0.5469	13.8906
9/16 in	0.5625	14.2875
37/64 in	0.5781	14.6844
19/32 in	0.5938	15.0813
39/64 in	0.6094	15.4781
5/8 in	0.625	15.875
41/64 in	0.6406	16.2719
43/64 in	0.6719	17.0656
11/16 in	0.6875	17.4625
45/64 in	0.7031	17.8594
23/32 in	0.7188	18.2563
47/64 in	0.7344	18.6531
3/4 in	0.75	19.05
49/64 in	0.7656	19.4469
25/32 in	0.7813	19.8438
51/64 in	0.7969	20.2406
13/16 in	0.8125	20.6375
53/64 in	0.8281	21.0344
27/32 in	0.8438	21.4313
55/64 in	0.8594	21.8281
7/8 in	0.875	22.225
57/64 in	0.8906	22.6219
29/32 in	0.9063	23.0188
21/23 in	0.913	23.1913
59/64 in	0.9219	23.4156
15/16 in	0.9375	23.8125
61/64 in	0.9531	24.2094
31/32 in	0.9688	24.6063
63/64 in	0.9844	25.0031
1 in	1	25.4
1 1/64 in	1.0156	25.7969
1 1/32 in	1.0313	26.1938
1 3/64 in	1.0469	26.5906
1 1/16 in	1.0625	26.9875
1 5/64 in	1.0781	27.3844
1 3/32 in	1.0938	27.7813
1 7/64 in	1.1094	28.1781
1 1/8 in	1.125	28.575
1 9/64 in	1.1406	28.9719
1 5/32 in	1.1563	29.3688
1 11/64 in	1.1719	29.7656
1 3/16 in	1.1875	30.1625
1 13/64 in	1.2031	30.5594
1 7/32 in	1.2188	30.9563
1 15/64 in	1.2344	31.3531
1 1/4 in	1.25	31.75
1 17/64 in	1.2656	32.1469
1 9/32 in	1.2813	32.5438
1 19/64 in	1.2969	32.9406
1 5/16 in	1.3125	33.3375
1 21/64 in	1.3281	33.7344
1 11/32 in	1.3438	34.1313
1 23/64 in	1.3594	34.5281
1 3/8 in	1.375	34.925
1 25/64 in	1.3906	35.3219
1 13/32 in	1.4063	35.7188
1 27/64 in	1.4219	36.1156
1 7/16 in	1.4375	36.5125
1 29/64 in	1.4531	36.9094
1 15/32 in	1.4688	37.3063
1 31/64 in	1.4844	37.7031
1 1/2 in	1.5	38.1

LETTER DRILL SIZES
Drill size	Diameter (in)	Diameter (mm)
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

METRIC DRILL SIZES
Drill size	Diameter (in)	Diameter (mm)
0.05 mm	0.002	0.05
0.1 mm	0.0039	0.1
0.2 mm	0.0079	0.2
0.3 mm	0.0118	0.3
0.4 mm	0.0158	0.4
0.5 mm	0.0197	0.5
0.6 mm	0.0236	0.6
0.7 mm	0.0276	0.7
0.8 mm	0.0315	0.8
0.9 mm	0.0354	0.9
1 mm	0.0394	1
1.1 mm	0.0433	1.1
1.2 mm	0.0472	1.2
1.3 mm	0.0512	1.3
1.4 mm	0.0551	1.4
1.5 mm	0.0591	1.5
1.6 mm	0.063	1.6
1.7 mm	0.0669	1.7
1.8 mm	0.0709	1.8
1.9 mm	0.0748	1.9
2 mm	0.0787	2
2.1 mm	0.0827	2.1
2.2 mm	0.0866	2.2
2.3 mm	0.0906	2.3
2.4 mm	0.0945	2.4
2.5 mm	0.0984	2.5
2.6 mm	0.1024	2.6
2.7 mm	0.1063	2.7
2.8 mm	0.1102	2.8
2.9 mm	0.1142	2.9
3 mm	0.1181	3
3.1 mm	0.1221	3.1
3.2 mm	0.126	3.2
3.3 mm	0.1299	3.3
3.4 mm	0.1339	3.4
3.5 mm	0.1378	3.5
3.6 mm	0.1417	3.6
3.7 mm	0.1457	3.7
3.8 mm	0.1496	3.8
3.9 mm	0.1535	3.9
4 mm	0.1575	4
4.1 mm	0.1614	4.1
4.2 mm	0.1654	4.2
4.3 mm	0.1693	4.3
4.4 mm	0.1732	4.4
4.5 mm	0.1772	4.5
4.6 mm	0.1811	4.6
4.7 mm	0.185	4.7
4.8 mm	0.189	4.8
4.9 mm	0.1929	4.9
5 mm	0.1969	5
5.1 mm	0.2008	5.1
5.2 mm	0.2047	5.2
5.3 mm	0.2087	5.3
5.4 mm	0.2126	5.4
5.5 mm	0.2165	5.5
5.6 mm	0.2205	5.6
5.7 mm	0.2244	5.7
5.8 mm	0.2284	5.8
5.9 mm	0.2323	5.9
6 mm	0.2362	6
6.1 mm	0.2402	6.1
6.2 mm	0.2441	6.2
6.3 mm	0.248	6.3
6.4 mm	0.252	6.4
6.5 mm	0.2559	6.5
6.6 mm	0.2598	6.6
6.7 mm	0.2638	6.7
6.8 mm	0.2677	6.8
6.9 mm	0.2717	6.9
7 mm	0.2756	7
7.1 mm	0.2795	7.1
7.2 mm	0.2835	7.2
7.3 mm	0.2874	7.3
7.4 mm	0.2913	7.4
7.5 mm	0.2953	7.5
7.6 mm	0.2992	7.6
7.7 mm	0.3032	7.7
7.8 mm	0.3071	7.8
7.9 mm	0.311	7.9
8 mm	0.315	8
8.1 mm	0.3189	8.1
8.2 mm	0.3228	8.2
8.3 mm	0.3268	8.3
8.4 mm	0.3307	8.4
8.5 mm	0.3347	8.5
8.6 mm	0.3386	8.6
8.7 mm	0.3425	8.7
8.8 mm	0.3465	8.8
8.9 mm	0.3504	8.9
9 mm	0.3543	9
9.1 mm	0.3583	9.1
9.2 mm	0.3622	9.2
9.3 mm	0.3661	9.3
9.4 mm	0.3701	9.4
9.5 mm	0.374	9.5
9.6 mm	0.378	9.6
9.7 mm	0.3819	9.7
9.8 mm	0.3858	9.8
9.9 mm	0.3898	9.9
10 mm	0.3937	10
10.5 mm	0.4134	10.5
11 mm	0.4331	11
11.5 mm	0.4528	11.5
12 mm	0.4724	12
12.5 mm	0.4921	12.5
13 mm	0.5118	13
13.5 mm	0.5315	13.5
14 mm	0.5512	14
14.5 mm	0.5709	14.5
15 mm	0.5906	15
15.5 mm	0.6102	15.5
16 mm	0.6299	16
16.5 mm	0.6496	16.5
17 mm	0.6693	17
17.5 mm	0.689	17.5
18 mm	0.7087	18
18.5 mm	0.7284	18.5
19 mm	0.748	19
19.5 mm	0.7677	19.5
20 mm	0.7874	20
20.5 mm	0.8071	20.5
21 mm	0.8268	21
21.5 mm	0.8465	21.5
22 mm	0.8661	22
22.5 mm	0.8858	22.5
23 mm	0.9055	23
23.5 mm	0.9252	23.5
24 mm	0.9449	24
24.5 mm	0.9646	24.5
25 mm	0.9843	25
25.5 mm	1.0039	25.5
26 mm	1.0236	26
26.5 mm	1.0433	26.5
27 mm	1.063	27
27.5 mm	1.0827	27.5
28 mm	1.1024	28
28.5 mm	1.1221	28.5
29 mm	1.1417	29
29.5 mm	1.1614	29.5
30 mm	1.1811	30
30.5 mm	1.2008	30.5
31 mm	1.2205	31
31.5 mm	1.2402	31.5
32 mm	1.2598	32
32.5 mm	1.2795	32.5
33 mm	1.2992	33
33.5 mm	1.3189	33.5
34 mm	1.3386	34
34.5 mm	1.3583	34.5
35 mm	1.378	35
35.5 mm	1.3976	35.5
36 mm	1.4173	36
36.5 mm	1.437	36.5
37 mm	1.4567	37
37.5 mm	1.4764	37.5
38 mm	1.4961	38

Wire Gauge Charts
Drill size	Diameter (in)	Diameter (mm)
#107	0.0019	0.0483
#106	0.0023	0.0584
#105	0.0027	0.0686
#104	0.0031	0.0787
#103	0.0035	0.0889
#102	0.0039	0.0991
#101	0.0043	0.1092
#100	0.0047	0.1194
#99	0.0051	0.1295
#98	0.0055	0.1397
#97	0.0059	0.1499
#96	0.0063	0.16
#95	0.0067	0.1702
#94	0.0071	0.1803
#93	0.0075	0.1905
#92	0.0079	0.2007
#91	0.0083	0.2108
#90	0.0087	0.221
#89	0.0091	0.2311
#88	0.0095	0.2413
#87	0.01	0.254
#86	0.0105	0.2667
#85	0.011	0.2794
#84	0.0115	0.2921
#83	0.012	0.3048
#82	0.0125	0.3175
#81	0.013	0.3302
#80	0.0135	0.3429
#79	0.0145	0.368
#78	0.016	0.4064
#77	0.018	0.4572
#76	0.02	0.508
#75	0.021	0.5334
#74	0.0225	0.5715
#73	0.024	0.6096
#72	0.025	0.635
#71	0.026	0.6604
#70	0.028	0.7112
#69	0.0292	0.7417
#68	0.031	0.7874
#67	0.032	0.8128
#66	0.033	0.8382
#65	0.035	0.889
#64	0.036	0.9144
#63	0.037	0.9398
#62	0.038	0.9652
#61	0.039	0.9906
#60	0.04	1.016
#59	0.041	1.0414
#58	0.042	1.0668
#57	0.043	1.0922
#56	0.0465	1.1811
#55	0.052	1.3208
#54	0.055	1.397
#53	0.0595	1.5113
#52	0.0635	1.6129
#51	0.067	1.7018
#50	0.07	1.778
#49	0.073	1.8542
#48	0.076	1.9304
#47	0.0785	1.9939
#46	0.081	2.0574
#45	0.082	2.0828
#44	0.086	2.1844
#43	0.089	2.2606
#42	0.0935	2.3749
#41	0.096	2.4384
#40	0.098	2.4892
#39	0.0995	2.5273
#38	0.1015	2.5781
#37	0.104	2.6416
#36	0.1065	2.7051
#35	0.11	2.794
#34	0.111	2.8194
#33	0.113	2.8702
#32	0.116	2.9464
#31	0.12	3.048
#30	0.1285	3.2639
#29	0.136	3.4544
#28	0.1405	3.5687
#27	0.144	3.6576
#26	0.147	3.7338
#25	0.1495	3.7973
#24	0.152	3.8608
#23	0.154	3.9116
#22	0.157	3.9878
#21	0.159	4.0386
#20	0.161	4.0894
#19	0.166	4.2164
#18	0.1695	4.3053
#17	0.173	4.3942
#16	0.177	4.4958
#15	0.18	4.572
#14	0.182	4.6228
#13	0.185	4.699
#12	0.189	4.8006
#11	0.191	4.8514
#10	0.1935	4.9149
#9	0.196	4.9784
#8	0.199	5.0546
#7	0.201	5.1054
#6	0.204	5.1816
#5	0.2055	5.2197
#4	0.209	5.3086
#3	0.213	5.4102
#2	0.221	5.6134
#1	0.228	5.7912

The drill size chart provides a list of standard size drill bits in several measurement systems, including fractional, metric, wire gauge number, and letter.

The decimal equivalents of the diameters are shown in both English and Metric units.

Fractional sizes are measured in inches, while metric sizes are measured in millimeters.

The wire gauge and letter systems refer to tool diameters that increase as the wire gauge decreases from #107 to #1 and then continues from A to Z.

The drill size chart contains tools up to 1.5 inches in diameter, but larger tools are also commonly used.

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Drill Bit Charts – Fraction, Metric, Letter & Wire Gauge

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