Drill/Bolt Conversion Chart

I use this often enough when I need to replace a bolt, drill a hole and I just need to get close enough.

Useful Size	Base 10 size	Metric
#107	0.0019	0.04826
0.05 mm	0.002	0.0508
#106	0.0023	0.05842
#105	0.0027	0.06858
#104	0.0031	0.07874
#103	0.0035	0.0889
#102	0.0039	0.09906
0.1 mm	0.0039	0.09906
#101	0.0043	0.10922
#100	0.0047	0.11938
#99	0.0051	0.12954
#98	0.0055	0.1397
#97	0.0059	0.14986
#96	0.0063	0.16002
#95	0.0067	0.17018
#94	0.0071	0.18034
#93	0.0075	0.1905
0.2 mm	0.0079	0.20066
#92	0.0079	0.20066
#91	0.0083	0.21082
#90	0.0087	0.22098
#89	0.0091	0.23114
#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
0.3 mm	0.0118	0.29972
#83	0.012	0.3048
#82	0.0125	0.3175
#81	0.013	0.3302
#80	0.0135	0.3429
#79	0.0145	0.3683
1/64 in	0.0156	0.39624
0.4 mm	0.0158	0.40132
#78	0.016	0.4064
#77	0.018	0.4572
0.5 mm	0.0197	0.50038
#76	0.02	0.508
#75	0.021	0.5334
#74	0.0225	0.5715
0.6 mm	0.0236	0.59944
#73	0.024	0.6096
#72	0.025	0.635
#71	0.026	0.6604
0.7 mm	0.0276	0.70104
#70	0.028	0.7112
#69	0.0292	0.74168
#68	0.031	0.7874
1/32 in	0.0313	0.79502
0.8 mm	0.0315	0.8001
#67	0.032	0.8128
#66	0.033	0.8382
#65	0.035	0.889
0.9 mm	0.0354	0.89916
#64	0.036	0.9144
#63	0.037	0.9398
#62	0.038	0.9652
#61	0.039	0.9906
1 mm	0.0394	1.00076
#60	0.04	1.016
#59	0.041	1.0414
#58	0.042	1.0668
#57	0.043	1.0922
1.1 mm	0.0433	1.09982
#56	0.0465	1.1811
3/64 in	0.0469	1.19126
1.2 mm	0.0472	1.19888
1.3 mm	0.0512	1.30048
#55	0.052	1.3208
#54	0.055	1.397
1.4 mm	0.0551	1.39954
1.5 mm	0.0591	1.50114
#53	0.0595	1.5113
1/16 in	0.0625	1.5875
1.6 mm	0.063	1.6002
#52	0.0635	1.6129
1.7 mm	0.0669	1.69926
#51	0.067	1.7018
#50	0.07	1.778
1.8 mm	0.0709	1.80086
#49	0.073	1.8542
1.9 mm	0.0748	1.89992
#48	0.076	1.9304
5/64 in	0.0781	1.98374
#47	0.0785	1.9939
2 mm	0.0787	1.99898
#46	0.081	2.0574
#45	0.082	2.0828
2.1 mm	0.0827	2.10058
#44	0.086	2.1844
2.2 mm	0.0866	2.19964
#43	0.089	2.2606
2.3 mm	0.0906	2.30124
#42	0.0935	2.3749
3/32 in	0.0938	2.38252
2.4 mm	0.0945	2.4003
#41	0.096	2.4384
#40	0.098	2.4892
2.5 mm	0.0984	2.49936
#39	0.0995	2.5273
#38	0.1015	2.5781
2.6 mm	0.1024	2.60096
#37	0.104	2.6416
2.7 mm	0.1063	2.70002
#36	0.1065	2.7051
7/64 in	0.1094	2.77876
#35	0.11	2.794
2.8 mm	0.1102	2.79908
#34	0.111	2.8194
#33	0.113	2.8702
2.9 mm	0.1142	2.90068
#32	0.116	2.9464
3 mm	0.1181	2.99974
#31	0.12	3.048
3.1 mm	0.1221	3.10134
1/8 in	0.125	3.175
3.2 mm	0.126	3.2004
#30	0.1285	3.2639
3.3 mm	0.1299	3.29946
3.4 mm	0.1339	3.40106
#29	0.136	3.4544
3.5 mm	0.1378	3.50012
#28	0.1405	3.5687
9/64 in	0.1406	3.57124
3.6 mm	0.1417	3.59918
#27	0.144	3.6576
3.7 mm	0.1457	3.70078
#26	0.147	3.7338
#25	0.1495	3.7973
3.8 mm	0.1496	3.79984
#24	0.152	3.8608
3.9 mm	0.1535	3.8989
#23	0.154	3.9116
5/32 in	0.1563	3.97002
#22	0.157	3.9878
4 mm	0.1575	4.0005
#21	0.159	4.0386
#20	0.161	4.0894
4.1 mm	0.1614	4.09956
4.2 mm	0.1654	4.20116
#19	0.166	4.2164
4.3 mm	0.1693	4.30022
#18	0.1695	4.3053
11/64 in	0.1719	4.36626
#17	0.173	4.3942
4.4 mm	0.1732	4.39928
#16	0.177	4.4958
4.5 mm	0.1772	4.50088
#15	0.18	4.572
4.6 mm	0.1811	4.59994
#14	0.182	4.6228
#13	0.185	4.699
4.7 mm	0.185	4.699
3/16 in	0.1875	4.7625
4.8 mm	0.189	4.8006
#12	0.189	4.8006
#11	0.191	4.8514
4.9 mm	0.1929	4.89966
#10	0.1935	4.9149
#9	0.196	4.9784
5 mm	0.1969	5.00126
#8	0.199	5.0546
5.1 mm	0.2008	5.10032
#7	0.201	5.1054
13/64 in	0.2031	5.15874
#6	0.204	5.1816
5.2 mm	0.2047	5.19938
#5	0.2055	5.2197
5.3 mm	0.2087	5.30098
#4	0.209	5.3086
5.4 mm	0.2126	5.40004
#3	0.213	5.4102
5.5 mm	0.2165	5.4991
7/32 in	0.2188	5.55752
5.6 mm	0.2205	5.6007
#2	0.221	5.6134
5.7 mm	0.2244	5.69976
#1	0.228	5.7912
5.8 mm	0.2284	5.80136
5.9 mm	0.2323	5.90042
A	0.234	5.9436
15/64 in	0.2344	5.95376
6 mm	0.2362	5.99948
B	0.238	6.0452
6.1 mm	0.2402	6.10108
C	0.242	6.1468
6.2 mm	0.2441	6.20014
D	0.246	6.2484
6.3 mm	0.248	6.2992
1/4 in	0.25	6.35
E	0.25	6.35
6.4 mm	0.252	6.4008
6.5 mm	0.2559	6.49986
F	0.257	6.5278
6.6 mm	0.2598	6.59892
G	0.261	6.6294
6.7 mm	0.2638	6.70052
17/64 in	0.2656	6.74624
H	0.266	6.7564
6.8 mm	0.2677	6.79958
6.9 mm	0.2717	6.90118
I	0.272	6.9088
7 mm	0.2756	7.00024
J	0.277	7.0358
7.1 mm	0.2795	7.0993
K	0.281	7.1374
9/32 in	0.2813	7.14502
7.2 mm	0.2835	7.2009
7.3 mm	0.2874	7.29996
L	0.29	7.366
7.4 mm	0.2913	7.39902
M	0.295	7.493
7.5 mm	0.2953	7.50062
19/64 in	0.2969	7.54126
7.6 mm	0.2992	7.59968
N	0.302	7.6708
7.7 mm	0.3032	7.70128
7.8 mm	0.3071	7.80034
7.9 mm	0.311	7.8994
5/16 in	0.3125	7.9375
8 mm	0.315	8.001
O	0.316	8.0264
8.1 mm	0.3189	8.10006
8.2 mm	0.3228	8.19912
P	0.323	8.2042
8.3 mm	0.3268	8.30072
21/64 in	0.3281	8.33374
8.4 mm	0.3307	8.39978
Q	0.332	8.4328
8.5 mm	0.3347	8.50138
8.6 mm	0.3386	8.60044
R	0.339	8.6106
8.7 mm	0.3425	8.6995
11/32 in	0.3438	8.73252
8.8 mm	0.3465	8.8011
S	0.348	8.8392
8.9 mm	0.3504	8.90016
9 mm	0.3543	8.99922
T	0.358	9.0932
9.1 mm	0.3583	9.10082
23/64 in	0.3594	9.12876
9.2 mm	0.3622	9.19988
9.3 mm	0.3661	9.29894
U	0.368	9.3472
9.4 mm	0.3701	9.40054
9.5 mm	0.374	9.4996
3/8 in	0.375	9.525
V	0.377	9.5758
9.6 mm	0.378	9.6012
9.7 mm	0.3819	9.70026
9.8 mm	0.3858	9.79932
W	0.386	9.8044
9.9 mm	0.3898	9.90092
25/64 in	0.3906	9.92124
10 mm	0.3937	9.99998
X	0.397	10.0838
Y	0.404	10.2616
13/32 in	0.4063	10.32002
Z	0.413	10.4902
10.5 mm	0.4134	10.50036
27/64 in	0.4219	10.71626
11 mm	0.4331	11.00074
7/16 in	0.4375	11.1125
11.5 mm	0.4528	11.50112
29/64 in	0.4531	11.50874
15/32 in	0.4688	11.90752
12 mm	0.4724	11.99896
31/64 in	0.4844	12.30376
12.5 mm	0.4921	12.49934
1/2 in	0.5	12.7
13 mm	0.5118	12.99972
33/64 in	0.5156	13.09624
17/32 in	0.5313	13.49502
13.5 mm	0.5315	13.5001
35/64 in	0.5469	13.89126
14 mm	0.5512	14.00048
9/16 in	0.5625	14.2875
14.5 mm	0.5709	14.50086
37/64 in	0.5781	14.68374
15 mm	0.5906	15.00124
19/32 in	0.5938	15.08252
39/64 in	0.6094	15.47876
15.5 mm	0.6102	15.49908
5/8 in	0.625	15.875
16 mm	0.6299	15.99946
41/64 in	0.6406	16.27124
16.5 mm	0.6496	16.49984
17 mm	0.6693	17.00022
43/64 in	0.6719	17.06626
11/16 in	0.6875	17.4625
17.5 mm	0.689	17.5006
45/64 in	0.7031	17.85874
18 mm	0.7087	18.00098
23/32 in	0.7188	18.25752
18.5 mm	0.7284	18.50136
47/64 in	0.7344	18.65376
19 mm	0.748	18.9992
3/4 in	0.75	19.05
49/64 in	0.7656	19.44624
19.5 mm	0.7677	19.49958
25/32 in	0.7813	19.84502
20 mm	0.7874	19.99996
51/64 in	0.7969	20.24126
20.5 mm	0.8071	20.50034
13/16 in	0.8125	20.6375
21 mm	0.8268	21.00072
53/64 in	0.8281	21.03374
27/32 in	0.8438	21.43252
21.5 mm	0.8465	21.5011
55/64 in	0.8594	21.82876
22 mm	0.8661	21.99894
7/8 in	0.875	22.225
22.5 mm	0.8858	22.49932
57/64 in	0.8906	22.62124
23 mm	0.9055	22.9997
29/32 in	0.9063	23.02002
21/23 in	0.913	23.1902
59/64 in	0.9219	23.41626
23.5 mm	0.9252	23.50008
15/16 in	0.9375	23.8125
24 mm	0.9449	24.00046
61/64 in	0.9531	24.20874
24.5 mm	0.9646	24.50084
31/32 in	0.9688	24.60752
25 mm	0.9843	25.00122
63/64 in	0.9844	25.00376
1 in	1	25.4
25.5 mm	1.0039	25.49906
1 1/64 in	1.0156	25.79624
26 mm	1.0236	25.99944
1 1/32 in	1.0313	26.19502
26.5 mm	1.0433	26.49982
1 3/64 in	1.0469	26.59126
1 1/16 in	1.0625	26.9875
27 mm	1.063	27.0002
1 5/64 in	1.0781	27.38374
27.5 mm	1.0827	27.50058
1 3/32 in	1.0938	27.78252
28 mm	1.1024	28.00096
1 7/64 in	1.1094	28.17876
28.5 mm	1.1221	28.50134
1 1/8 in	1.125	28.575
1 9/64 in	1.1406	28.97124
29 mm	1.1417	28.99918
1 5/32 in	1.1563	29.37002
29.5 mm	1.1614	29.49956
1 11/64 in	1.1719	29.76626
30 mm	1.1811	29.99994
1 3/16 in	1.1875	30.1625
30.5 mm	1.2008	30.50032
1 13/64 in	1.2031	30.55874
1 7/32 in	1.2188	30.95752
31 mm	1.2205	31.0007
1 15/64 in	1.2344	31.35376
31.5 mm	1.2402	31.50108
1 1/4 in	1.25	31.75
32 mm	1.2598	31.99892
1 17/64 in	1.2656	32.14624
32.5 mm	1.2795	32.4993
1 9/32 in	1.2813	32.54502
1 19/64 in	1.2969	32.94126
33 mm	1.2992	32.99968
1 5/16 in	1.3125	33.3375
33.5 mm	1.3189	33.50006
1 21/64 in	1.3281	33.73374
34 mm	1.3386	34.00044
1 11/32 in	1.3438	34.13252
34.5 mm	1.3583	34.50082
1 23/64 in	1.3594	34.52876
1 3/8 in	1.375	34.925
35 mm	1.378	35.0012
1 25/64 in	1.3906	35.32124
35.5 mm	1.3976	35.49904
1 13/32 in	1.4063	35.72002
36 mm	1.4173	35.99942
1 27/64 in	1.4219	36.11626
36.5 mm	1.437	36.4998
1 7/16 in	1.4375	36.5125
1 29/64 in	1.4531	36.90874
37 mm	1.4567	37.00018
1 15/32 in	1.4688	37.30752
37.5 mm	1.4764	37.50056
1 31/64 in	1.4844	37.70376
38 mm	1.4961	38.00094
1 1/2 in	1.5	38.1