Drill Bit Size Charts

 

This drill bit size chart provides a list of sizes in several measurement systems, including fractional, metric, wire gauge number, and letter.

 


 

Fractional Drill Bit Size Chart


 

 


 

Drill sizeDiameter (in)Diameter (mm)
1/64 in0.01560.3969
1/32 in0.03130.7938
3/64 in0.04691.1906
1/16 in0.06251.5875
5/64 in0.07811.9844
3/32 in0.09382.3813
7/64 in0.10942.7781
1/8 in0.1253.175
9/64 in0.14063.5719
5/32 in0.15633.9688
11/64 in0.17194.3656
3/16 in0.18754.7625
13/64 in0.20315.1594
7/32 in0.21885.5563
15/64 in0.23445.9531
1/4 in0.256.35
17/64 in0.26566.7469
9/32 in0.28137.1438
19/64 in0.29697.5406
5/16 in0.31257.9375
21/64 in0.32818.3344
11/32 in0.34388.7313
23/64 in0.35949.1281
3/8 in0.3759.525
25/64 in0.39069.9219
13/32 in0.406310.3188
27/64 in0.421910.7156
7/16 in0.437511.1125
29/64 in0.453111.5094
15/32 in0.468811.9063
31/64 in0.484412.3031
1/2 in0.512.7
33/64 in0.515613.0969
17/32 in0.531313.4938
35/64 in0.546913.8906
9/16 in0.562514.2875
37/64 in0.578114.6844
19/32 in0.593815.0813
39/64 in0.609415.4781
5/8 in0.62515.875
41/64 in0.640616.2719
43/64 in0.671917.0656
11/16 in0.687517.4625
45/64 in0.703117.8594
23/32 in0.718818.2563
47/64 in0.734418.6531
3/4 in0.7519.05
49/64 in0.765619.4469
25/32 in0.781319.8438
51/64 in0.796920.2406
13/16 in0.812520.6375
53/64 in0.828121.0344
27/32 in0.843821.4313
55/64 in0.859421.8281
7/8 in0.87522.225
57/64 in0.890622.6219
29/32 in0.906323.0188
21/23 in0.91323.1913
59/64 in0.921923.4156
15/16 in0.937523.8125
61/64 in0.953124.2094
31/32 in0.968824.6063
63/64 in0.984425.0031
1 in125.4
1 1/64 in1.015625.7969
1 1/32 in1.031326.1938
1 3/64 in1.046926.5906
1 1/16 in1.062526.9875
1 5/64 in1.078127.3844
1 3/32 in1.093827.7813
1 7/64 in1.109428.1781
1 1/8 in1.12528.575
1 9/64 in1.140628.9719
1 5/32 in1.156329.3688
1 11/64 in1.171929.7656
1 3/16 in1.187530.1625
1 13/64 in1.203130.5594
1 7/32 in1.218830.9563
1 15/64 in1.234431.3531
1 1/4 in1.2531.75
1 17/64 in1.265632.1469
1 9/32 in1.281332.5438
1 19/64 in1.296932.9406
1 5/16 in1.312533.3375
1 21/64 in1.328133.7344
1 11/32 in1.343834.1313
1 23/64 in1.359434.5281
1 3/8 in1.37534.925
1 25/64 in1.390635.3219
1 13/32 in1.406335.7188
1 27/64 in1.421936.1156
1 7/16 in1.437536.5125
1 29/64 in1.453136.9094
1 15/32 in1.468837.3063
1 31/64 in1.484437.7031
1 1/2 in1.538.1


 

 


 

Metric Drive Size Chart


 

 


 

Drill sizeDiameter (in)Diameter (mm)
0.05 mm0.0020.05
0.1 mm0.00390.1
0.2 mm0.00790.2
0.3 mm0.01180.3
0.4 mm0.01580.4
0.5 mm0.01970.5
0.6 mm0.02360.6
0.7 mm0.02760.7
0.8 mm0.03150.8
0.9 mm0.03540.9
1 mm0.03941
1.1 mm0.04331.1
1.2 mm0.04721.2
1.3 mm0.05121.3
1.4 mm0.05511.4
1.5 mm0.05911.5
1.6 mm0.0631.6
1.7 mm0.06691.7
1.8 mm0.07091.8
1.9 mm0.07481.9
2 mm0.07872
2.1 mm0.08272.1
2.2 mm0.08662.2
2.3 mm0.09062.3
2.4 mm0.09452.4
2.5 mm0.09842.5
2.6 mm0.10242.6
2.7 mm0.10632.7
2.8 mm0.11022.8
2.9 mm0.11422.9
3 mm0.11813
3.1 mm0.12213.1
3.2 mm0.1263.2
3.3 mm0.12993.3
3.4 mm0.13393.4
3.5 mm0.13783.5
3.6 mm0.14173.6
3.7 mm0.14573.7
3.8 mm0.14963.8
3.9 mm0.15353.9
4 mm0.15754
4.1 mm0.16144.1
4.2 mm0.16544.2
4.3 mm0.16934.3
4.4 mm0.17324.4
4.5 mm0.17724.5
4.6 mm0.18114.6
4.7 mm0.1854.7
4.8 mm0.1894.8
4.9 mm0.19294.9
5 mm0.19695
5.1 mm0.20085.1
5.2 mm0.20475.2
5.3 mm0.20875.3
5.4 mm0.21265.4
5.5 mm0.21655.5
5.6 mm0.22055.6
5.7 mm0.22445.7
5.8 mm0.22845.8
5.9 mm0.23235.9
6 mm0.23626
6.1 mm0.24026.1
6.2 mm0.24416.2
6.3 mm0.2486.3
6.4 mm0.2526.4
6.5 mm0.25596.5
6.6 mm0.25986.6
6.7 mm0.26386.7
6.8 mm0.26776.8
6.9 mm0.27176.9
7 mm0.27567
7.1 mm0.27957.1
7.2 mm0.28357.2
7.3 mm0.28747.3
7.4 mm0.29137.4
7.5 mm0.29537.5
7.6 mm0.29927.6
7.7 mm0.30327.7
7.8 mm0.30717.8
7.9 mm0.3117.9
8 mm0.3158
8.1 mm0.31898.1
8.2 mm0.32288.2
8.3 mm0.32688.3
8.4 mm0.33078.4
8.5 mm0.33478.5
8.6 mm0.33868.6
8.7 mm0.34258.7
8.8 mm0.34658.8
8.9 mm0.35048.9
9 mm0.35439
9.1 mm0.35839.1
9.2 mm0.36229.2
9.3 mm0.36619.3
9.4 mm0.37019.4
9.5 mm0.3749.5
9.6 mm0.3789.6
9.7 mm0.38199.7
9.8 mm0.38589.8
9.9 mm0.38989.9
10 mm0.393710
10.5 mm0.413410.5
11 mm0.433111
11.5 mm0.452811.5
12 mm0.472412
12.5 mm0.492112.5
13 mm0.511813
13.5 mm0.531513.5
14 mm0.551214
14.5 mm0.570914.5
15 mm0.590615
15.5 mm0.610215.5
16 mm0.629916
16.5 mm0.649616.5
17 mm0.669317
17.5 mm0.68917.5
18 mm0.708718
18.5 mm0.728418.5
19 mm0.74819
19.5 mm0.767719.5
20 mm0.787420
20.5 mm0.807120.5
21 mm0.826821
21.5 mm0.846521.5
22 mm0.866122
22.5 mm0.885822.5
23 mm0.905523
23.5 mm0.925223.5
24 mm0.944924
24.5 mm0.964624.5
25 mm0.984325
25.5 mm1.003925.5
26 mm1.023626
26.5 mm1.043326.5
27 mm1.06327
27.5 mm1.082727.5
28 mm1.102428
28.5 mm1.122128.5
29 mm1.141729
29.5 mm1.161429.5
30 mm1.181130
30.5 mm1.200830.5
31 mm1.220531
31.5 mm1.240231.5
32 mm1.259832
32.5 mm1.279532.5
33 mm1.299233
33.5 mm1.318933.5
34 mm1.338634
34.5 mm1.358334.5
35 mm1.37835
35.5 mm1.397635.5
36 mm1.417336
36.5 mm1.43736.5
37 mm1.456737
37.5 mm1.476437.5
38 mm1.496138


 

Letter Drill Bit Sizes


 

DrillInchmm
A0.2345.94
B0.2386.05
C0.2426.15
D0.2466.25
E0.256.35
F0.2576.53
G0.2616.63
H0.2666.76
I0.2726.91
J0.2777.04
K0.2817.14
L0.297.37
M0.2957.49
N0.3027.67
O0.3168.03
P0.3238.2
Q0.3328.43
R0.3398.61
S0.3488.84
T0.3589.09
U0.3689.35
V0.3779.58
W0.3869.8
X0.39710.08
Y0.40410.26
Z0.41310.49


 

Wire Gauge Size Chart


 

Drill sizeDiameter (in)Diameter (mm)
#1070.00190.0483
#1060.00230.0584
#1050.00270.0686
#1040.00310.0787
#1030.00350.0889
#1020.00390.0991
#1010.00430.1092
#1000.00470.1194
#990.00510.1295
#980.00550.1397
#970.00590.1499
#960.00630.16
#950.00670.1702
#940.00710.1803
#930.00750.1905
#920.00790.2007
#910.00830.2108
#900.00870.221
#890.00910.2311
#880.00950.2413
#870.010.254
#860.01050.2667
#850.0110.2794
#840.01150.2921
#830.0120.3048
#820.01250.3175
#810.0130.3302
#800.01350.3429
#790.01450.368
#780.0160.4064
#770.0180.4572
#760.020.508
#750.0210.5334
#740.02250.5715
#730.0240.6096
#720.0250.635
#710.0260.6604
#700.0280.7112
#690.02920.7417
#680.0310.7874
#670.0320.8128
#660.0330.8382
#650.0350.889
#640.0360.9144
#630.0370.9398
#620.0380.9652
#610.0390.9906
#600.041.016
#590.0411.0414
#580.0421.0668
#570.0431.0922
#560.04651.1811
#550.0521.3208
#540.0551.397
#530.05951.5113
#520.06351.6129
#510.0671.7018
#500.071.778
#490.0731.8542
#480.0761.9304
#470.07851.9939
#460.0812.0574
#450.0822.0828
#440.0862.1844
#430.0892.2606
#420.09352.3749
#410.0962.4384
#400.0982.4892
#390.09952.5273
#380.10152.5781
#370.1042.6416
#360.10652.7051
#350.112.794
#340.1112.8194
#330.1132.8702
#320.1162.9464
#310.123.048
#300.12853.2639
#290.1363.4544
#280.14053.5687
#270.1443.6576
#260.1473.7338
#250.14953.7973
#240.1523.8608
#230.1543.9116
#220.1573.9878
#210.1594.0386
#200.1614.0894
#190.1664.2164
#180.16954.3053
#170.1734.3942
#160.1774.4958
#150.184.572
#140.1824.6228
#130.1854.699
#120.1894.8006
#110.1914.8514
#100.19354.9149
#90.1964.9784
#80.1995.0546
#70.2015.1054
#60.2045.1816
#50.20555.2197
#40.2095.3086
#30.2135.4102
#20.2215.6134
#10.2285.7912


 

 


 

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