Calculators

Take advantage of our convenient conversion charts and calculators below.

Decimal Equivalent Chart

DRILL SIZE	MM	DECIMAL EQUIVALENT	DRILL SIZE	MM	DECIMAL EQUIVALENT	DRILL SIZE	MM	DECIMAL EQUIVALENT
	0.1	0.0039		4	0.1575		14	0.5512
	0.2	0.0079	21	4.04	0.159	9/16	14.29	0.5625
	0.25	0.0098	20	4.09	0.161	37/64	14.68	0.5781
	0.3	0.0118	19	4.22	0.166		15	0.5906
80	0.34	0.0135	18	4.31	0.1695	19/32	15.08	0.5938
79	0.37	0.0145	11/64	4.37	0.1719	39/64	15.48	0.6094
1/64	0.4	0.0156	17	4.39	0.173	5/8	15.88	0.625
78	0.41	0.016	16	4.5	0.177		16	0.6299
77	0.46	0.018	15	4.57	0.18	41/64	16.27	0.6406
	0.5	0.0197	14	4.62	0.182	21/32	16.67	0.6562
76	0.51	0.02	13	4.7	0.185		17	0.6693
75	0.53	0.021	3/16	4.76	0.1875	43/64	17.07	0.6719
74	0.57	0.0225	12	4.8	0.189	11/16	17.46	0.6875
	0.6	0.0236	11	4.85	0.191	45/64	17.86	0.7031
73	0.61	0.024	10	4.91	0.1935		18	0.7087
72	0.64	0.025	9	4.98	0.196	23/32	18.26	0.7188
71	0.66	0.026		5	0.1968	47/64	18.65	0.7344
	0.7	0.0276	8	5.05	0.199		19	0.748
70	0.71	0.028	7	5.11	0.201	3/4	19.05	0.75
69	0.74	0.0292	13/64	5.16	0.2031	49/64	19.45	0.7656
	0.75	0.0295	6	5.18	0.204	25/32	19.84	0.7812
68	0.79	0.031	5	5.22	0.2055		20	0.7874
1/32	0.79	0.0313	4	5.31	0.209	51/64	20.24	0.7969
	0.8	0.0315	3	5.41	0.213	13/16	20.64	0.8125
67	0.81	0.032	7/32	5.56	0.2188		21	0.8268
66	0.84	0.033	2	5.61	0.221	53/64	21.03	0.8281
65	0.89	0.035	1	5.79	0.228	27/32	21.43	0.8438
	0.9	0.0354	A	5.94	0.234	55/64	21.84	0.8594
64	0.91	0.036	15/64	5.95	0.2344		22	0.8661
63	0.94	0.037		6	0.2362	7/8	22.23	0.875
62	0.97	0.038	B	6.05	0.238	57/64	22.62	0.8906
61	0.99	0.039	C	6.15	0.242		23	0.9055
	1	0.0394	D	6.25	0.246	29/32	23.02	0.9062
60	1.02	0.04	1/4	6.35	0.25	59/64	23.42	0.9219
59	1.04	0.0401	E	6.35	0.25	15/16	23.81	0.9375
58	1.07	0.042	F	6.53	0.2507		24	0.9449
57	1.09	0.043	G	6.63	0.261	61/64	24.21	0.9531
56	1.18	0.0465	17/64	6.75	0.2656	31/32	24.61	0.9688
3/64	1.19	0.0469	H	6.76	0.266		25	0.9842
55	1.32	0.052	I	6.91	0.272	63/64	25	0.9844
54	1.4	0.055		7	0.2756	1"	25.4	1
53	1.51	0.0595	J	7.04	0.277
1/16	1.59	0.0625	K	7.14	0.281
52	1.61	0.0635	9/32	7.14	0.2812
51	1.7	0.067	L	7.37	0.29
50	1.78	0.07	M	7.49	0.295
49	1.85	0.073	19/64	7.54	0.2969
48	1.93	0.076	N	7.67	0.302
5/64	1.98	0.0781	5/16	7.94	0.3125
47	1.99	0.0785		8	0.315
	2	0.0787	0	8.03	0.316
46	2.06	0.081	p	8.2	0.323
45	2.08	0.082	21/64	8.33	0.3281
44	2.18	0.086	Q	8.43	0.332
43	2.26	0.089	R	8.61	0.339
42	2.37	0.0935	11/32	8.73	0.3438
3/32	2.38	0.0938	s	8.84	0.348
41	2.44	0.096		9	0.3543
40	2.5	0.098	T	9.09	0.358
39	2.53	0.0995	23/64	9.13	0.3594
38	2.58	0.1015	u	9.35	0.368
37	2.64	0.104	3/8	9.53	0.375
36	2.71	0.1065	V	9.56	0.377
7/64	2.78	0.1094	w	9.8	0.386
35	2.79	0.11	25/64	9.92	0.3906
34	2.82	0.11		10	0.3937
33	2.87	0.113	X	10.08	0.397
32	2.95	0.116	y	10.26	0.404
	3	0.1181	13/32	10.32	0.4062
31	3.05	0.12	z	10.49	0.413
1/8	3.18	0.125	27/64	10.72	0.4219
30	3.26	0.1285		11	0.4331
29	3.45	0.136	7/16	11.11	0.4375
28	3.57	0.1405	29/64	11.51	0.4531
9/64	3.57	0.1406	15/32	11.91	0.4688
27	3.66	0.144		12	0.4724
26	3.73	0.147	31/64	12.3	0.4844
25	3.8	0.1495	1/2	12.7	0.5
24	3.86	0.152		13	0.5118
23	3.91	0.154	33/64	13.1	0.5156
5/32	3.97	0.1562	17/32	13.49	0.5132
22	3.99	0.157	35/64	13.89	0.5469

Tap Drill Chart

TAP SIZE	DRILL SIZE	PROBABLE % THREAD	TAP SIZE	DRILL SIZE	PROBABLE % THREAD	TAP SIZE	DRILL SIZE	PROBABLE % THREAD
0-80	3/64	71-81	M6x1	10	76-84	1-8	7/8	73-77
M1.6x.35	1.25mm	67-77	1/4-20	7	70-75	1-12	59/64	67-72
1-64	53	59-67	1/4-28	3	72-80	1-14	15/16	61-67
M2 x .4	1/16	72-79	5/16-18	F	72-77	1-1/8-7	63/64	72-76
1-72	53	67-75	5/16-24	I	67-75	1-1/8-12	1-3/64	66-72
2-56	51	62-69	M8 x 1.25	6.7mm	74-80	M30 x 3.5	1-3/64	75
2-64	50	70-79	3/8-16	5/16	72-77	1-1/4-7	1-7/64	76
M2.5 x .45	2.05mm	69-77	3/8-24	Q	71-79	1-1/4-12	1-11/64	72
3-48	5/64	70-77	M10 x 1.5	8.4mm	76-82	1-3/8-6	1-7/32	72
3-56	46	69-78	7/16-14	u	70-75	1-3/8-12	1-19/64	72
4-40	44	65-71	7/16-20	25/64	65-72	M36x4	1-1/4	82
4-48	42	61-88	M12x1.75	13/32	69-74	1-1/2-6	1-11/32	72
M3 x.5	40	70-79	1/2-13	27/64	73-78	1-1/2-12	1-27/64	72
5-40	39	65-72	1/2-20	29/64	65-72
5-44	38	63-71	M14x2	15/32	76-81
M3.5 x .6	33	72-81	9/16-12	31/64	68-72
6-32	36	71-78	9/16-18	33/64	58-65
6-40	33	69-77	5/8-11	17/32	75-79
M4x .7	3.25mm	74-82	5/8-18	37/64	58-65
8-32	29	62-69	M16x2	35/64	76-81
8-36	29	70-78	3/4-10	21/32	68-72
10-24	25	69-75	3/4-16	11/16	71-77
10-32	21	68-76	M20 x2.5	11/16	74-78
MS x.8	4.2mm	69-77	7/8-9	49/64	72-76
12-24	17	66-72	7/8-14	13/16	62-67
12-28	15	70-78	M24x3	53/64	72-76

Decimal Equivalent Chart

DRILL SIZE	MM	DECIMAL EQUIVALENT
	0.1	0.0039
	0.2	0.0079
	0.25	0.0098
	0.3	0.0118
80	0.34	0.0135
79	0.37	0.0145
1/64	0.4	0.0156
78	0.41	0.016
77	0.46	0.018
	0.5	0.0197
76	0.51	0.02
75	0.53	0.021
74	0.57	0.0225
	0.6	0.0236
73	0.61	0.024
72	0.64	0.025
71	0.66	0.026
	0.7	0.0276
70	0.71	0.028
69	0.74	0.0292
	0.75	0.0295
68	0.79	0.031
1/32	0.79	0.0313
	0.8	0.0315
67	0.81	0.032
66	0.84	0.033
65	0.89	0.035
	0.9	0.0354
64	0.91	0.036
63	0.94	0.037
62	0.97	0.038
61	0.99	0.039
	1	0.0394
60	1.02	0.04
59	1.04	0.0401
58	1.07	0.042
57	1.09	0.043
56	1.18	0.0465
3/64	1.19	0.0469
55	1.32	0.052
54	1.4	0.055
53	1.51	0.0595
1/16	1.59	0.0625
52	1.61	0.0635
51	1.7	0.067
50	1.78	0.07
49	1.85	0.073
48	1.93	0.076
5/64	1.98	0.0781
47	1.99	0.0785
	2	0.0787
46	2.06	0.081
45	2.08	0.082
44	2.18	0.086
43	2.26	0.089
42	2.37	0.0935
3/32	2.38	0.0938
41	2.44	0.096
40	2.5	0.098
39	2.53	0.0995
38	2.58	0.1015
37	2.64	0.104
36	2.71	0.1065
7/64	2.78	0.1094
35	2.79	0.11
34	2.82	0.11
33	2.87	0.113
32	2.95	0.116
	3	0.1181
31	3.05	0.12
1/8	3.18	0.125
30	3.26	0.1285
29	3.45	0.136
28	3.57	0.1405
9/64	3.57	0.1406
27	3.66	0.144
26	3.73	0.147
25	3.8	0.1495
24	3.86	0.152
23	3.91	0.154
5/32	3.97	0.1562
22	3.99	0.157
	4	0.1575
21	4.04	0.159
20	4.09	0.161
19	4.22	0.166
18	4.31	0.1695
11/64	4.37	0.1719
17	4.39	0.173
16	4.5	0.177
15	4.57	0.18
14	4.62	0.182
13	4.7	0.185
3/16	4.76	0.1875
12	4.8	0.189
11	4.85	0.191
10	4.91	0.1935
9	4.98	0.196
	5	0.1968
8	5.05	0.199
7	5.11	0.201
13/64	5.16	0.2031
6	5.18	0.204
5	5.22	0.2055
4	5.31	0.209
3	5.41	0.213
7/32	5.56	0.2188
2	5.61	0.221
1	5.79	0.228
A	5.94	0.234
15/64	5.95	0.2344
	6	0.2362
B	6.05	0.238
C	6.15	0.242
D	6.25	0.246
1/4	6.35	0.25
E	6.35	0.25
F	6.53	0.2507
G	6.63	0.261
17/64	6.75	0.2656
H	6.76	0.266
I	6.91	0.272
	7	0.2756
J	7.04	0.277
K	7.14	0.281
9/32	7.14	0.2812
L	7.37	0.29
M	7.49	0.295
19/64	7.54	0.2969
N	7.67	0.302
5/16	7.94	0.3125
	8	0.315
0	8.03	0.316
p	8.2	0.323
21/64	8.33	0.3281
Q	8.43	0.332
R	8.61	0.339
11/32	8.73	0.3438
s	8.84	0.348
	9	0.3543
T	9.09	0.358
23/64	9.13	0.3594
u	9.35	0.368
3/8	9.53	0.375
V	9.56	0.377
w	9.8	0.386
25/64	9.92	0.3906
	10	0.3937
X	10.08	0.397
y	10.26	0.404
13/32	10.32	0.4062
z	10.49	0.413
27/64	10.72	0.4219
	11	0.4331
7/16	11.11	0.4375
29/64	11.51	0.4531
15/32	11.91	0.4688
	12	0.4724
31/64	12.3	0.4844
1/2	12.7	0.5
	13	0.5118
33/64	13.1	0.5156
17/32	13.49	0.5132
35/64	13.89	0.5469
	14	0.5512
9/16	14.29	0.5625
37/64	14.68	0.5781
	15	0.5906
19/32	15.08	0.5938
39/64	15.48	0.6094
5/8	15.88	0.625
	16	0.6299
41/64	16.27	0.6406
21/32	16.67	0.6562
	17	0.6693
43/64	17.07	0.6719
11/16	17.46	0.6875
45/64	17.86	0.7031
	18	0.7087
23/32	18.26	0.7188
47/64	18.65	0.7344
	19	0.748
3/4	19.05	0.75
49/64	19.45	0.7656
25/32	19.84	0.7812
	20	0.7874
51/64	20.24	0.7969
13/16	20.64	0.8125
	21	0.8268
53/64	21.03	0.8281
27/32	21.43	0.8438
55/64	21.84	0.8594
	22	0.8661
7/8	22.23	0.875
57/64	22.62	0.8906
	23	0.9055
29/32	23.02	0.9062
59/64	23.42	0.9219
15/16	23.81	0.9375
	24	0.9449
61/64	24.21	0.9531
31/32	24.61	0.9688
	25	0.9842
63/64	25	0.9844
1"	25.4	1

Tap Drill Chart

TAP SIZE	DRILL SIZE	PROBABLE % THREAD
0-80	3/64	71-81
M1.6x.35	1.25mm	67-77
1-64	53	59-67
M2 x .4	1/16	72-79
1-72	53	67-75
2-56	51	62-69
2-64	50	70-79
M2.5 x .45	2.05mm	69-77
3-48	5/64	70-77
3-56	46	69-78
4-40	44	65-71
4-48	42	61-88
M3 x.5	40	70-79
5-40	39	65-72
5-44	38	63-71
M3.5 x .6	33	72-81
6-32	36	71-78
6-40	33	69-77
M4x .7	3.25mm	74-82
8-32	29	62-69
8-36	29	70-78
10-24	25	69-75
10-32	21	68-76
MS x.8	4.2mm	69-77
12-24	17	66-72
12-28	15	70-78
M6x1	10	76-84
1/4-20	7	70-75
1/4-28	3	72-80
5/16-18	F	72-77
5/16-24	I	67-75
M8 x 1.25	6.7mm	74-80
3/8-16	5/16	72-77
3/8-24	Q	71-79
M10 x 1.5	8.4mm	76-82
7/16-14	u	70-75
7/16-20	25/64	65-72
M12x1.75	13/32	69-74
1/2-13	27/64	73-78
1/2-20	29/64	65-72
M14x2	15/32	76-81
9/16-12	31/64	68-72
9/16-18	33/64	58-65
5/8-11	17/32	75-79
5/8-18	37/64	58-65
M16x2	35/64	76-81
3/4-10	21/32	68-72
3/4-16	11/16	71-77
M20 x2.5	11/16	74-78
7/8-9	49/64	72-76
7/8-14	13/16	62-67
M24x3	53/64	72-76
1-8	7/8	73-77
1-12	59/64	67-72
1-14	15/16	61-67
1-1/8-7	63/64	72-76
1-1/8-12	1-3/64	66-72
M30 x 3.5	1-3/64	75
1-1/4-7	1-7/64	76
1-1/4-12	1-11/64	72
1-3/8-6	1-7/32	72
1-3/8-12	1-19/64	72
M36x4	1-1/4	82
1-1/2-6	1-11/32	72
1-1/2-12	1-27/64	72