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Drill Bit Size Chart

Complete reference for number drills (#80–#1), letter drills (A–Z), fractional drills (1/64"–1"), and metric drills (0.30–25 mm) — all with decimal-inch and mm equivalents, sorted by decimal size. Type any size, decimal, or mm value to jump to the nearest match. Export as CSV.

HOW IT WORKS

Filter by type — show All drills, Number (#80–#1), Letter (A–Z), Fractional, or Metric only.
Search by label — type "#42", "A", "3/8", or "6.5 mm" to filter matching rows instantly.
Search by decimal or mm value — type a number like "0.25" (inches) or "6.5" (mm) to jump to the nearest drill size.
Click any row to highlight it and read off decimal-inch and mm equivalents.
Export CSV to save the full chart for your shop floor or engineering notebook.

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Drill Size Chart

Number (#80–#1), letter (A–Z), fractional (1/64"–1"), and metric (0.30–25 mm) drill sizes — sorted by decimal. Search by size label or decimal/mm value to jump to the nearest match.

294 sizes

Size	Type	Decimal (in)	mm
0.30 mm	mm	0.0118	0.300
#80	#	0.0135	0.343
0.35 mm	mm	0.0138	0.350
#79	#	0.0145	0.368
1/64"	FRAC	0.0156	0.397
0.40 mm	mm	0.0157	0.400
#78	#	0.0160	0.406
0.45 mm	mm	0.0177	0.450
#77	#	0.0180	0.457
0.50 mm	mm	0.0197	0.500
#76	#	0.0200	0.508
#75	#	0.0210	0.533
0.55 mm	mm	0.0217	0.550
#74	#	0.0225	0.571
0.60 mm	mm	0.0236	0.600
#73	#	0.0240	0.610
#72	#	0.0250	0.635
0.65 mm	mm	0.0256	0.650
#71	#	0.0260	0.660
0.70 mm	mm	0.0276	0.700
#70	#	0.0280	0.711
#69	#	0.0292	0.742
0.75 mm	mm	0.0295	0.750
#68	#	0.0310	0.787
1/32"	FRAC	0.0313	0.794
0.80 mm	mm	0.0315	0.800
#67	#	0.0320	0.813
#66	#	0.0330	0.838
0.85 mm	mm	0.0335	0.850
#65	#	0.0350	0.889
0.90 mm	mm	0.0354	0.900
#64	#	0.0360	0.914
#63	#	0.0370	0.940
0.95 mm	mm	0.0374	0.950
#62	#	0.0380	0.965
#61	#	0.0390	0.991
1.00 mm	mm	0.0394	1.000
#60	#	0.0400	1.016
#59	#	0.0410	1.041
#58	#	0.0420	1.067
#57	#	0.0430	1.092
1.10 mm	mm	0.0433	1.100
#56	#	0.0465	1.181
3/64"	FRAC	0.0469	1.191
1.20 mm	mm	0.0472	1.200
1.30 mm	mm	0.0512	1.300
#55	#	0.0520	1.321
#54	#	0.0550	1.397
1.40 mm	mm	0.0551	1.400
1.50 mm	mm	0.0591	1.500
#53	#	0.0595	1.511
1/16"	FRAC	0.0625	1.587
1.60 mm	mm	0.0630	1.600
#52	#	0.0635	1.613
1.70 mm	mm	0.0669	1.700
#51	#	0.0670	1.702
#50	#	0.0700	1.778
1.80 mm	mm	0.0709	1.800
#49	#	0.0730	1.854
1.90 mm	mm	0.0748	1.900
#48	#	0.0760	1.930
5/64"	FRAC	0.0781	1.984
#47	#	0.0785	1.994
2.00 mm	mm	0.0787	2.000
#46	#	0.0810	2.057
#45	#	0.0820	2.083
2.10 mm	mm	0.0827	2.100
#44	#	0.0860	2.184
2.20 mm	mm	0.0866	2.200
#43	#	0.0890	2.261
2.30 mm	mm	0.0906	2.300
#42	#	0.0935	2.375
3/32"	FRAC	0.0938	2.381
2.40 mm	mm	0.0945	2.400
#41	#	0.0960	2.438
#40	#	0.0980	2.489
2.50 mm	mm	0.0984	2.500
#39	#	0.0995	2.527
#38	#	0.1015	2.578
2.60 mm	mm	0.1024	2.600
#37	#	0.1040	2.642
2.70 mm	mm	0.1063	2.700
#36	#	0.1065	2.705
7/64"	FRAC	0.1094	2.778
#35	#	0.1100	2.794
2.80 mm	mm	0.1102	2.800
#34	#	0.1110	2.819
#33	#	0.1130	2.870
2.90 mm	mm	0.1142	2.900
#32	#	0.1160	2.946
3.00 mm	mm	0.1181	3.000
#31	#	0.1200	3.048
3.10 mm	mm	0.1220	3.100
1/8"	FRAC	0.1250	3.175
3.20 mm	mm	0.1260	3.200
#30	#	0.1285	3.264
3.30 mm	mm	0.1299	3.300
3.40 mm	mm	0.1339	3.400
#29	#	0.1360	3.454
3.50 mm	mm	0.1378	3.500
#28	#	0.1405	3.569
9/64"	FRAC	0.1406	3.572
3.60 mm	mm	0.1417	3.600
#27	#	0.1440	3.658
3.70 mm	mm	0.1457	3.700
#26	#	0.1470	3.734
#25	#	0.1495	3.797
3.80 mm	mm	0.1496	3.800
#24	#	0.1520	3.861
3.90 mm	mm	0.1535	3.900
#23	#	0.1540	3.912
5/32"	FRAC	0.1563	3.969
#22	#	0.1570	3.988
4.00 mm	mm	0.1575	4.000
#21	#	0.1590	4.039
#20	#	0.1610	4.089
4.10 mm	mm	0.1614	4.100
4.20 mm	mm	0.1654	4.200
#19	#	0.1660	4.216
4.30 mm	mm	0.1693	4.300
#18	#	0.1695	4.305
11/64"	FRAC	0.1719	4.366
#17	#	0.1730	4.394
4.40 mm	mm	0.1732	4.400
#16	#	0.1770	4.496
4.50 mm	mm	0.1772	4.500
#15	#	0.1800	4.572
4.60 mm	mm	0.1811	4.600
#14	#	0.1820	4.623
#13	#	0.1850	4.699
4.70 mm	mm	0.1850	4.700
3/16"	FRAC	0.1875	4.762
4.80 mm	mm	0.1890	4.800
#12	#	0.1890	4.801
#11	#	0.1910	4.851
4.90 mm	mm	0.1929	4.900
#10	#	0.1935	4.915
#9	#	0.1960	4.978
5.00 mm	mm	0.1969	5.000
#8	#	0.1990	5.055
5.10 mm	mm	0.2008	5.100
#7	#	0.2010	5.105
13/64"	FRAC	0.2031	5.159
#6	#	0.2040	5.182
5.20 mm	mm	0.2047	5.200
#5	#	0.2055	5.220
5.30 mm	mm	0.2087	5.300
#4	#	0.2090	5.309
5.40 mm	mm	0.2126	5.400
#3	#	0.2130	5.410
5.50 mm	mm	0.2165	5.500
7/32"	FRAC	0.2188	5.556
5.60 mm	mm	0.2205	5.600
#2	#	0.2210	5.613
5.70 mm	mm	0.2244	5.700
#1	#	0.2280	5.791
5.80 mm	mm	0.2283	5.800
5.90 mm	mm	0.2323	5.900
A	A–Z	0.2340	5.944
15/64"	FRAC	0.2344	5.953
6.00 mm	mm	0.2362	6.000
B	A–Z	0.2380	6.045
6.10 mm	mm	0.2402	6.100
C	A–Z	0.2420	6.147
6.20 mm	mm	0.2441	6.200
D	A–Z	0.2460	6.248
6.30 mm	mm	0.2480	6.300
E	A–Z	0.2500	6.350
1/4"	FRAC	0.2500	6.350
6.40 mm	mm	0.2520	6.400
6.50 mm	mm	0.2559	6.500
F	A–Z	0.2570	6.528
6.60 mm	mm	0.2598	6.600
G	A–Z	0.2610	6.629
6.70 mm	mm	0.2638	6.700
17/64"	FRAC	0.2656	6.747
H	A–Z	0.2660	6.756
6.80 mm	mm	0.2677	6.800
6.90 mm	mm	0.2717	6.900
I	A–Z	0.2720	6.909
7.00 mm	mm	0.2756	7.000
J	A–Z	0.2770	7.036
7.10 mm	mm	0.2795	7.100
K	A–Z	0.2810	7.137
9/32"	FRAC	0.2813	7.144
7.20 mm	mm	0.2835	7.200
7.30 mm	mm	0.2874	7.300
L	A–Z	0.2900	7.366
7.40 mm	mm	0.2913	7.400
M	A–Z	0.2950	7.493
7.50 mm	mm	0.2953	7.500
19/64"	FRAC	0.2969	7.541
7.60 mm	mm	0.2992	7.600
N	A–Z	0.3020	7.671
7.70 mm	mm	0.3031	7.700
7.80 mm	mm	0.3071	7.800
7.90 mm	mm	0.3110	7.900
5/16"	FRAC	0.3125	7.938
8.00 mm	mm	0.3150	8.000
O	A–Z	0.3160	8.026
8.10 mm	mm	0.3189	8.100
8.20 mm	mm	0.3228	8.200
P	A–Z	0.3230	8.204
8.30 mm	mm	0.3268	8.300
21/64"	FRAC	0.3281	8.334
8.40 mm	mm	0.3307	8.400
Q	A–Z	0.3320	8.433
8.50 mm	mm	0.3346	8.500
8.60 mm	mm	0.3386	8.600
R	A–Z	0.3390	8.611
8.70 mm	mm	0.3425	8.700
11/32"	FRAC	0.3438	8.731
8.80 mm	mm	0.3465	8.800
S	A–Z	0.3480	8.839
8.90 mm	mm	0.3504	8.900
9.00 mm	mm	0.3543	9.000
T	A–Z	0.3580	9.093
9.10 mm	mm	0.3583	9.100
23/64"	FRAC	0.3594	9.128
9.20 mm	mm	0.3622	9.200
9.30 mm	mm	0.3661	9.300
U	A–Z	0.3680	9.347
9.40 mm	mm	0.3701	9.400
9.50 mm	mm	0.3740	9.500
3/8"	FRAC	0.3750	9.525
V	A–Z	0.3770	9.576
9.60 mm	mm	0.3780	9.600
9.70 mm	mm	0.3819	9.700
9.80 mm	mm	0.3858	9.800
W	A–Z	0.3860	9.804
9.90 mm	mm	0.3898	9.900
25/64"	FRAC	0.3906	9.922
10.00 mm	mm	0.3937	10.000
X	A–Z	0.3970	10.084
10.20 mm	mm	0.4016	10.200
Y	A–Z	0.4040	10.262
13/32"	FRAC	0.4063	10.319
Z	A–Z	0.4130	10.490
10.50 mm	mm	0.4134	10.500
27/64"	FRAC	0.4219	10.716
11.00 mm	mm	0.4331	11.000
7/16"	FRAC	0.4375	11.112
11.50 mm	mm	0.4528	11.500
29/64"	FRAC	0.4531	11.509
15/32"	FRAC	0.4688	11.906
12.00 mm	mm	0.4724	12.000
31/64"	FRAC	0.4844	12.303
12.50 mm	mm	0.4921	12.500
1/2"	FRAC	0.5000	12.700
13.00 mm	mm	0.5118	13.000
33/64"	FRAC	0.5156	13.097
17/32"	FRAC	0.5313	13.494
35/64"	FRAC	0.5469	13.891
14.00 mm	mm	0.5512	14.000
9/16"	FRAC	0.5625	14.287
37/64"	FRAC	0.5781	14.684
15.00 mm	mm	0.5906	15.000
19/32"	FRAC	0.5938	15.081
39/64"	FRAC	0.6094	15.478
5/8"	FRAC	0.6250	15.875
16.00 mm	mm	0.6299	16.000
41/64"	FRAC	0.6406	16.272
21/32"	FRAC	0.6563	16.669
17.00 mm	mm	0.6693	17.000
43/64"	FRAC	0.6719	17.066
11/16"	FRAC	0.6875	17.462
45/64"	FRAC	0.7031	17.859
18.00 mm	mm	0.7087	18.000
23/32"	FRAC	0.7188	18.256
47/64"	FRAC	0.7344	18.653
19.00 mm	mm	0.7480	19.000
3/4"	FRAC	0.7500	19.050
49/64"	FRAC	0.7656	19.447
25/32"	FRAC	0.7813	19.844
20.00 mm	mm	0.7874	20.000
51/64"	FRAC	0.7969	20.241
13/16"	FRAC	0.8125	20.637
21.00 mm	mm	0.8268	21.000
53/64"	FRAC	0.8281	21.034
27/32"	FRAC	0.8438	21.431
55/64"	FRAC	0.8594	21.828
22.00 mm	mm	0.8661	22.000
7/8"	FRAC	0.8750	22.225
57/64"	FRAC	0.8906	22.622
23.00 mm	mm	0.9055	23.000
29/32"	FRAC	0.9063	23.019
59/64"	FRAC	0.9219	23.416
15/16"	FRAC	0.9375	23.813
24.00 mm	mm	0.9449	24.000
61/64"	FRAC	0.9531	24.209
31/32"	FRAC	0.9688	24.606
25.00 mm	mm	0.9843	25.000
63/64"	FRAC	0.9844	25.003
1"	FRAC	1.0000	25.400

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