This Table lists the American Standard Number, Letter, & Fractional Drill Sizes
With their Decimal Equivalents

Click here for Metric sizes

Drill size	Decimal	Drill size	Decimal	Drill size	Decimal
80	.0135	1/8	.1250	O	.3160
79	.0145	30	.1285	P	.3230
1/64	.0156	29	.1360	21/64	.3281
78	.0160	28	.1405	Q	.3320
77	.0180	9/64	.1406	R	.3390
76	.0200	27	.1440	11/32	.3437
75	.0210	26	.1470	S	.3480
74	.0225	25	.1495	T	.3580
73	.0240	24	.1520	23/64	.3594
72	.0250	23	.1540	U	.3680
71	.0260	5/32	.1562	3/8	.3750
70	.0280	22	.1570	V	.3770
69	.0292	21	.1590	W	.3860
68	.0310	20	.1610	25/64	.3906
1/32	.0313	19	.1660	X	.3970
67	.0320	18	.1695	Y	.4040
66	.0330	11/64	.1719	13/32	.4062
65	.0350	17	.1730	Z	.4130
64	.0360	16	.1770	27/64	.4219
63	.0370	15	.1800	7/16	.4375
62	.0380	14	.1820	29/64	.4531
61	.0390	13	.1850	15/32	.4687
60	.0400	3/16	.1875	31/64	.4844
59	.0410	12	.1890	½	.5000
58	.0420	11	.1910	33/64	.5156
57	.0430	10	.1935	17/32	.5312
56	.0465	9	.1960	35/64	.5469
3/64	.0469	8	.1990	9/16	.5625
55	.0520	7	.2010	37/64	.5781
54	.0550	13/64	.2031	19/32	.5937
53	.0595	6	.2040	39/64	.6094
1/16	.0625	5	.2055	5/8	.6250
52	.0635	4	.2090	41/64	.6406
51	.0670	3	.2130	21/32	.6562
50	.0700	7/32	.2187	43/64	.6719
49	.0730	2	.2210	11/16	.6875
48	.0760	1	.2280	45/64	.7031
5/64	.0781	A	.2340	23/32	.7187
47	.0785	15/64	.2344	47/64	.7344
46	.0810	B	.2380	¾	.7500
45	.0820	C	.2420	49/64	.7656
44	.0860	D	.2460	25/32	.7812
43	.0890	E	.2500	51/64	.7969
42	.0935	¼	.2500	13/16	.8125
3/32	.0937	F	.2570	53/64	.8281
41	.0960	G	.2610	27/32	.8437
40	.0980	17/64	.2656	55/64	.8594
39	.0995	H	.2660	7/8	.8750
3/32	.0937	F	.2570	53/64	.8281
37	.1040	J	.2770	29/32	.9062
36	.1065	K	.2811	59/64	.9219
7/64	.1093	9/32	.2812	15/16	.9375
35	.1015	I	.2720	57/64	.8906
34	.1110	M	.2950	31/32	.9687
33	.1130	19/64	.2968	63/64	.9844
32	.1160	N	.3020	1	1.000
31	.1200	5/16	.3125