DRILL SIZE CHART

Drill Size Chart

Every number (#1–#80), letter (A–Z), fractional (1/64″–1″) and common metric drill in one list, sorted by diameter, with decimal inches and millimeters. Type a size to find the closest drills.

FIND A DRILL

Closest drills to a size

Drill name or size (#7, F, 5/16, 0.201, 6.5)

Plain numbers use the selected unit. Fractions are always inches.

#7Number0.2010 in · 5.105 mmexact
5.1 mmMetric0.2008 in · 5.100 mm−0.0002 in
#8Number0.1990 in · 5.055 mm−0.0020 in
13/64"Fractional0.2031 in · 5.159 mm+0.0021 in
#6Number0.2040 in · 5.182 mm+0.0030 in
5.2 mmMetric0.2047 in · 5.200 mm+0.0037 in

DECIMAL EQUIVALENTS

Drill size chart with decimal and mm

286 drills sorted by diameter · number and letter sizes per ASME B94.11M
Drill	Type	Inches	mm
#80	Number	0.0135	0.343
#79	Number	0.0145	0.368
1/64"	Fractional	0.0156	0.397
#78	Number	0.0160	0.406
#77	Number	0.0180	0.457
0.5 mm	Metric	0.0197	0.500
#76	Number	0.0200	0.508
#75	Number	0.0210	0.533
#74	Number	0.0225	0.571
0.6 mm	Metric	0.0236	0.600
#73	Number	0.0240	0.610
#72	Number	0.0250	0.635
#71	Number	0.0260	0.660
0.7 mm	Metric	0.0276	0.700
#70	Number	0.0280	0.711
#69	Number	0.0292	0.742
#68	Number	0.0310	0.787
1/32"	Fractional	0.0313	0.794
0.8 mm	Metric	0.0315	0.800
#67	Number	0.0320	0.813
#66	Number	0.0330	0.838
#65	Number	0.0350	0.889
0.9 mm	Metric	0.0354	0.900
#64	Number	0.0360	0.914
#63	Number	0.0370	0.940
#62	Number	0.0380	0.965
#61	Number	0.0390	0.991
1.0 mm	Metric	0.0394	1.000
#60	Number	0.0400	1.016
#59	Number	0.0410	1.041
#58	Number	0.0420	1.067
#57	Number	0.0430	1.092
1.1 mm	Metric	0.0433	1.100
#56	Number	0.0465	1.181
3/64"	Fractional	0.0469	1.191
1.2 mm	Metric	0.0472	1.200
1.3 mm	Metric	0.0512	1.300
#55	Number	0.0520	1.321
#54	Number	0.0550	1.397
1.4 mm	Metric	0.0551	1.400
1.5 mm	Metric	0.0591	1.500
#53	Number	0.0595	1.511
1/16"	Fractional	0.0625	1.587
1.6 mm	Metric	0.0630	1.600
#52	Number	0.0635	1.613
1.7 mm	Metric	0.0669	1.700
#51	Number	0.0670	1.702
#50	Number	0.0700	1.778
1.8 mm	Metric	0.0709	1.800
#49	Number	0.0730	1.854
1.9 mm	Metric	0.0748	1.900
#48	Number	0.0760	1.930
5/64"	Fractional	0.0781	1.984
#47	Number	0.0785	1.994
2.0 mm	Metric	0.0787	2.000
#46	Number	0.0810	2.057
#45	Number	0.0820	2.083
2.1 mm	Metric	0.0827	2.100
#44	Number	0.0860	2.184
2.2 mm	Metric	0.0866	2.200
#43	Number	0.0890	2.261
2.3 mm	Metric	0.0906	2.300
#42	Number	0.0935	2.375
3/32"	Fractional	0.0938	2.381
2.4 mm	Metric	0.0945	2.400
#41	Number	0.0960	2.438
#40	Number	0.0980	2.489
2.5 mm	Metric	0.0984	2.500
#39	Number	0.0995	2.527
#38	Number	0.1015	2.578
2.6 mm	Metric	0.1024	2.600
#37	Number	0.1040	2.642
2.7 mm	Metric	0.1063	2.700
#36	Number	0.1065	2.705
7/64"	Fractional	0.1094	2.778
#35	Number	0.1100	2.794
2.8 mm	Metric	0.1102	2.800
#34	Number	0.1110	2.819
#33	Number	0.1130	2.870
2.9 mm	Metric	0.1142	2.900
#32	Number	0.1160	2.946
3.0 mm	Metric	0.1181	3.000
#31	Number	0.1200	3.048
3.1 mm	Metric	0.1220	3.100
1/8"	Fractional	0.1250	3.175
3.2 mm	Metric	0.1260	3.200
#30	Number	0.1285	3.264
3.3 mm	Metric	0.1299	3.300
3.4 mm	Metric	0.1339	3.400
#29	Number	0.1360	3.454
3.5 mm	Metric	0.1378	3.500
#28	Number	0.1405	3.569
9/64"	Fractional	0.1406	3.572
3.6 mm	Metric	0.1417	3.600
#27	Number	0.1440	3.658
3.7 mm	Metric	0.1457	3.700
#26	Number	0.1470	3.734
#25	Number	0.1495	3.797
3.8 mm	Metric	0.1496	3.800
#24	Number	0.1520	3.861
3.9 mm	Metric	0.1535	3.900
#23	Number	0.1540	3.912
5/32"	Fractional	0.1563	3.969
#22	Number	0.1570	3.988
4.0 mm	Metric	0.1575	4.000
#21	Number	0.1590	4.039
#20	Number	0.1610	4.089
4.1 mm	Metric	0.1614	4.100
4.2 mm	Metric	0.1654	4.200
#19	Number	0.1660	4.216
4.3 mm	Metric	0.1693	4.300
#18	Number	0.1695	4.305
11/64"	Fractional	0.1719	4.366
#17	Number	0.1730	4.394
4.4 mm	Metric	0.1732	4.400
#16	Number	0.1770	4.496
4.5 mm	Metric	0.1772	4.500
#15	Number	0.1800	4.572
4.6 mm	Metric	0.1811	4.600
#14	Number	0.1820	4.623
#13	Number	0.1850	4.699
4.7 mm	Metric	0.1850	4.700
3/16"	Fractional	0.1875	4.762
4.8 mm	Metric	0.1890	4.800
#12	Number	0.1890	4.801
#11	Number	0.1910	4.851
4.9 mm	Metric	0.1929	4.900
#10	Number	0.1935	4.915
#9	Number	0.1960	4.978
5.0 mm	Metric	0.1969	5.000
#8	Number	0.1990	5.055
5.1 mm	Metric	0.2008	5.100
#7	Number	0.2010	5.105
13/64"	Fractional	0.2031	5.159
#6	Number	0.2040	5.182
5.2 mm	Metric	0.2047	5.200
#5	Number	0.2055	5.220
5.3 mm	Metric	0.2087	5.300
#4	Number	0.2090	5.309
5.4 mm	Metric	0.2126	5.400
#3	Number	0.2130	5.410
5.5 mm	Metric	0.2165	5.500
7/32"	Fractional	0.2188	5.556
5.6 mm	Metric	0.2205	5.600
#2	Number	0.2210	5.613
5.7 mm	Metric	0.2244	5.700
#1	Number	0.2280	5.791
5.8 mm	Metric	0.2283	5.800
5.9 mm	Metric	0.2323	5.900
A	Letter	0.2340	5.944
15/64"	Fractional	0.2344	5.953
6.0 mm	Metric	0.2362	6.000
B	Letter	0.2380	6.045
6.1 mm	Metric	0.2402	6.100
C	Letter	0.2420	6.147
6.2 mm	Metric	0.2441	6.200
D	Letter	0.2460	6.248
6.3 mm	Metric	0.2480	6.300
1/4"	Fractional	0.2500	6.350
E	Letter	0.2500	6.350
6.4 mm	Metric	0.2520	6.400
6.5 mm	Metric	0.2559	6.500
F	Letter	0.2570	6.528
6.6 mm	Metric	0.2598	6.600
G	Letter	0.2610	6.629
6.7 mm	Metric	0.2638	6.700
17/64"	Fractional	0.2656	6.747
H	Letter	0.2660	6.756
6.8 mm	Metric	0.2677	6.800
6.9 mm	Metric	0.2717	6.900
I	Letter	0.2720	6.909
7.0 mm	Metric	0.2756	7.000
J	Letter	0.2770	7.036
7.1 mm	Metric	0.2795	7.100
K	Letter	0.2810	7.137
9/32"	Fractional	0.2813	7.144
7.2 mm	Metric	0.2835	7.200
7.3 mm	Metric	0.2874	7.300
L	Letter	0.2900	7.366
7.4 mm	Metric	0.2913	7.400
M	Letter	0.2950	7.493
7.5 mm	Metric	0.2953	7.500
19/64"	Fractional	0.2969	7.541
7.6 mm	Metric	0.2992	7.600
N	Letter	0.3020	7.671
7.7 mm	Metric	0.3031	7.700
7.8 mm	Metric	0.3071	7.800
7.9 mm	Metric	0.3110	7.900
5/16"	Fractional	0.3125	7.938
8.0 mm	Metric	0.3150	8.000
O	Letter	0.3160	8.026
8.1 mm	Metric	0.3189	8.100
8.2 mm	Metric	0.3228	8.200
P	Letter	0.3230	8.204
8.3 mm	Metric	0.3268	8.300
21/64"	Fractional	0.3281	8.334
8.4 mm	Metric	0.3307	8.400
Q	Letter	0.3320	8.433
8.5 mm	Metric	0.3346	8.500
8.6 mm	Metric	0.3386	8.600
R	Letter	0.3390	8.611
8.7 mm	Metric	0.3425	8.700
11/32"	Fractional	0.3438	8.731
8.8 mm	Metric	0.3465	8.800
S	Letter	0.3480	8.839
8.9 mm	Metric	0.3504	8.900
9.0 mm	Metric	0.3543	9.000
T	Letter	0.3580	9.093
9.1 mm	Metric	0.3583	9.100
23/64"	Fractional	0.3594	9.128
9.2 mm	Metric	0.3622	9.200
9.3 mm	Metric	0.3661	9.300
U	Letter	0.3680	9.347
9.4 mm	Metric	0.3701	9.400
9.5 mm	Metric	0.3740	9.500
3/8"	Fractional	0.3750	9.525
V	Letter	0.3770	9.576
9.6 mm	Metric	0.3780	9.600
9.7 mm	Metric	0.3819	9.700
9.8 mm	Metric	0.3858	9.800
W	Letter	0.3860	9.804
9.9 mm	Metric	0.3898	9.900
25/64"	Fractional	0.3906	9.922
10.0 mm	Metric	0.3937	10.000
X	Letter	0.3970	10.084
Y	Letter	0.4040	10.262
13/32"	Fractional	0.4063	10.319
Z	Letter	0.4130	10.490
10.5 mm	Metric	0.4134	10.500
27/64"	Fractional	0.4219	10.716
11.0 mm	Metric	0.4331	11.000
7/16"	Fractional	0.4375	11.112
11.5 mm	Metric	0.4528	11.500
29/64"	Fractional	0.4531	11.509
15/32"	Fractional	0.4688	11.906
12.0 mm	Metric	0.4724	12.000
31/64"	Fractional	0.4844	12.303
12.5 mm	Metric	0.4921	12.500
1/2"	Fractional	0.5000	12.700
13.0 mm	Metric	0.5118	13.000
33/64"	Fractional	0.5156	13.097
17/32"	Fractional	0.5313	13.494
13.5 mm	Metric	0.5315	13.500
35/64"	Fractional	0.5469	13.891
14.0 mm	Metric	0.5512	14.000
9/16"	Fractional	0.5625	14.287
14.5 mm	Metric	0.5709	14.500
37/64"	Fractional	0.5781	14.684
15.0 mm	Metric	0.5906	15.000
19/32"	Fractional	0.5938	15.081
39/64"	Fractional	0.6094	15.478
15.5 mm	Metric	0.6102	15.500
5/8"	Fractional	0.6250	15.875
16.0 mm	Metric	0.6299	16.000
41/64"	Fractional	0.6406	16.272
16.5 mm	Metric	0.6496	16.500
21/32"	Fractional	0.6563	16.669
17.0 mm	Metric	0.6693	17.000
43/64"	Fractional	0.6719	17.066
11/16"	Fractional	0.6875	17.462
17.5 mm	Metric	0.6890	17.500
45/64"	Fractional	0.7031	17.859
18.0 mm	Metric	0.7087	18.000
23/32"	Fractional	0.7188	18.256
18.5 mm	Metric	0.7283	18.500
47/64"	Fractional	0.7344	18.653
19.0 mm	Metric	0.7480	19.000
3/4"	Fractional	0.7500	19.050
49/64"	Fractional	0.7656	19.447
19.5 mm	Metric	0.7677	19.500
25/32"	Fractional	0.7813	19.844
20.0 mm	Metric	0.7874	20.000
51/64"	Fractional	0.7969	20.241
13/16"	Fractional	0.8125	20.637
53/64"	Fractional	0.8281	21.034
27/32"	Fractional	0.8438	21.431
55/64"	Fractional	0.8594	21.828
7/8"	Fractional	0.8750	22.225
57/64"	Fractional	0.8906	22.622
29/32"	Fractional	0.9063	23.019
59/64"	Fractional	0.9219	23.416
15/16"	Fractional	0.9375	23.813
61/64"	Fractional	0.9531	24.209
31/32"	Fractional	0.9688	24.606
63/64"	Fractional	0.9844	25.003
1"	Fractional	1.0000	25.400

Number and letter drill decimals follow ASME B94.11M as tabulated in Drill bit sizes. Fractional and metric rows are exact conversions (1 in = 25.4 mm). Metric sizes are listed every 0.1 mm to 10 mm, then every 0.5 mm.

HOW THE SYSTEMS FIT

Four drill series, one diameter scale.

Number drills run backwards: #80 is the smallest at 0.0135 in and #1 the largest at 0.2280 in. Letter drills continue upward from A (0.2340 in) to Z (0.4130 in). Together they fill the gaps between fractional sizes, which is why tap drill charts call for drills like #7 or F.

A drilled hole usually comes out slightly larger than the drill, depending on the material, drill condition and setup. For a tight fit, drill undersize and ream.

Drilling for a thread? Use the tap drill chart. Converting a fraction? Open the decimal to fraction chart.