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Drill Size Chart & Lookup

Search and compare source-audited metric, fractional-inch, number, and letter drill designations in one reference instead of separate thin pages for every size.

Part of Workshop Calc ↗
Primary display unit

Includes metric drills from 0.2 to 20.0 mm, 1/64-inch fractions through 1 inch, #80–#1, and A–Z. Dimensions are nominal; verify the drill maker's tolerance before critical work.

Matching stock drills

369 / 369

Stock drill size equivalents
SizeFamilymminch
Metric0.20.0079
Metric0.30.0118
Number0.3430.0135
Number0.3680.0145
Fractional inch0.3970.0156
Metric0.40.0157
Number0.4060.016
Number0.4570.018
Metric0.50.0197
Number0.5080.02
Number0.5330.021
Number0.5720.0225
Metric0.60.0236
Number0.610.024
Number0.6350.025
Number0.660.026
Metric0.70.0276
Number0.7110.028
Number0.7420.0292
Number0.7870.031
Fractional inch0.7940.0313
Metric0.80.0315
Number0.8130.032
Number0.8380.033
Number0.8890.035
Metric0.90.0354
Number0.9140.036
Number0.940.037
Number0.9650.038
Number0.9910.039
Metric10.0394
Number1.0160.04
Number1.0410.041
Number1.0670.042
Number1.0920.043
Metric1.10.0433
Number1.1810.0465
Fractional inch1.1910.0469
Metric1.20.0472
Metric1.30.0512
Number1.3210.052
Number1.3970.055
Metric1.40.0551
Metric1.50.0591
Number1.5110.0595
Fractional inch1.5880.0625
Metric1.60.063
Number1.6130.0635
Metric1.70.0669
Number1.7020.067
Number1.7780.07
Metric1.80.0709
Number1.8540.073
Metric1.90.0748
Number1.930.076
Fractional inch1.9840.0781
Number1.9940.0785
Metric20.0787
Number2.0570.081
Number2.0830.082
Metric2.10.0827
Number2.1840.086
Metric2.20.0866
Number2.2610.089
Metric2.30.0906
Number2.3750.0935
Fractional inch2.3810.0938
Metric2.40.0945
Number2.4380.096
Number2.4890.098
Metric2.50.0984
Number2.5270.0995
Number2.5780.1015
Metric2.60.1024
Number2.6420.104
Metric2.70.1063
Number2.7050.1065
Fractional inch2.7780.1094
Number2.7940.11
Metric2.80.1102
Number2.8190.111
Number2.870.113
Metric2.90.1142
Number2.9460.116
Metric30.1181
Number3.0480.12
Metric3.10.122
Fractional inch3.1750.125
Metric3.20.126
Number3.2640.1285
Metric3.30.1299
Metric3.40.1339
Number3.4540.136
Metric3.50.1378
Number3.5690.1405
Fractional inch3.5720.1406
Metric3.60.1417
Number3.6580.144
Metric3.70.1457
Number3.7340.147
Number3.7970.1495
Metric3.80.1496
Number3.8610.152
Metric3.90.1535
Number3.9120.154
Fractional inch3.9690.1563
Number3.9880.157
Metric40.1575
Number4.0390.159
Number4.0890.161
Metric4.10.1614
Metric4.20.1654
Number4.2160.166
Metric4.30.1693
Number4.3050.1695
Fractional inch4.3660.1719
Number4.3940.173
Metric4.40.1732
Number4.4960.177
Metric4.50.1772
Number4.5720.18
Metric4.60.1811
Number4.6230.182
Number4.6990.185
Metric4.70.185
Fractional inch4.7630.1875
Metric4.80.189
Number4.8010.189
Number4.8510.191
Metric4.90.1929
Number4.9150.1935
Number4.9780.196
Metric50.1969
Number5.0550.199
Metric5.10.2008
Number5.1050.201
Fractional inch5.1590.2031
Number5.1820.204
Metric5.20.2047
Number5.220.2055
Metric5.30.2087
Number5.3090.209
Metric5.40.2126
Number5.410.213
Metric5.50.2165
Fractional inch5.5560.2188
Metric5.60.2205
Number5.6130.221
Metric5.70.2244
Number5.7910.228
Metric5.80.2283
Metric5.90.2323
Letter5.9440.234
Fractional inch5.9530.2344
Metric60.2362
Letter6.0450.238
Metric6.10.2402
Letter6.1470.242
Metric6.20.2441
Letter6.2480.246
Metric6.30.248
Fractional inch6.350.25
Letter6.350.25
Metric6.40.252
Metric6.50.2559
Letter6.5280.257
Metric6.60.2598
Letter6.6290.261
Metric6.70.2638
Fractional inch6.7470.2656
Letter6.7560.266
Metric6.80.2677
Metric6.90.2717
Letter6.9090.272
Metric70.2756
Letter7.0360.277
Metric7.10.2795
Letter7.1370.281
Fractional inch7.1440.2813
Metric7.20.2835
Metric7.30.2874
Letter7.3660.29
Metric7.40.2913
Letter7.4930.295
Metric7.50.2953
Fractional inch7.5410.2969
Metric7.60.2992
Letter7.6710.302
Metric7.70.3031
Metric7.80.3071
Metric7.90.311
Fractional inch7.9380.3125
Metric80.315
Letter8.0260.316
Metric8.10.3189
Metric8.20.3228
Letter8.2040.323
Metric8.30.3268
Fractional inch8.3340.3281
Metric8.40.3307
Letter8.4330.332
Metric8.50.3346
Metric8.60.3386
Letter8.6110.339
Metric8.70.3425
Fractional inch8.7310.3438
Metric8.80.3465
Letter8.8390.348
Metric8.90.3504
Metric90.3543
Letter9.0930.358
Metric9.10.3583
Fractional inch9.1280.3594
Metric9.20.3622
Metric9.30.3661
Letter9.3470.368
Metric9.40.3701
Metric9.50.374
Fractional inch9.5250.375
Letter9.5760.377
Metric9.60.378
Metric9.70.3819
Metric9.80.3858
Letter9.8040.386
Metric9.90.3898
Fractional inch9.9220.3906
Metric100.3937
Letter10.0840.397
Metric10.10.3976
Metric10.20.4016
Letter10.2620.404
Metric10.30.4055
Fractional inch10.3190.4063
Metric10.40.4094
Letter10.490.413
Metric10.50.4134
Metric10.60.4173
Metric10.70.4213
Fractional inch10.7160.4219
Metric10.80.4252
Metric10.90.4291
Metric110.4331
Metric11.10.437
Fractional inch11.1130.4375
Metric11.20.4409
Metric11.30.4449
Metric11.40.4488
Metric11.50.4528
Fractional inch11.5090.4531
Metric11.60.4567
Metric11.70.4606
Metric11.80.4646
Metric11.90.4685
Fractional inch11.9060.4688
Metric120.4724
Metric12.10.4764
Metric12.20.4803
Metric12.30.4843
Fractional inch12.3030.4844
Metric12.40.4882
Metric12.50.4921
Metric12.60.4961
Fractional inch12.70.5
Metric12.70.5
Metric12.80.5039
Metric12.90.5079
Metric130.5118
Fractional inch13.0970.5156
Metric13.10.5157
Metric13.20.5197
Metric13.30.5236
Metric13.40.5276
Fractional inch13.4940.5313
Metric13.50.5315
Metric13.60.5354
Metric13.70.5394
Metric13.80.5433
Fractional inch13.8910.5469
Metric13.90.5472
Metric140.5512
Metric14.10.5551
Metric14.20.5591
Fractional inch14.2880.5625
Metric14.30.563
Metric14.40.5669
Metric14.50.5709
Metric14.60.5748
Fractional inch14.6840.5781
Metric14.70.5787
Metric14.80.5827
Metric14.90.5866
Metric150.5906
Fractional inch15.0810.5938
Metric15.10.5945
Metric15.20.5984
Metric15.30.6024
Metric15.40.6063
Fractional inch15.4780.6094
Metric15.50.6102
Metric15.60.6142
Metric15.70.6181
Metric15.80.622
Fractional inch15.8750.625
Metric15.90.626
Metric160.6299
Metric16.10.6339
Metric16.20.6378
Fractional inch16.2720.6406
Metric16.30.6417
Metric16.40.6457
Metric16.50.6496
Metric16.60.6535
Fractional inch16.6690.6563
Metric16.70.6575
Metric16.80.6614
Metric16.90.6654
Metric170.6693
Fractional inch17.0660.6719
Metric17.10.6732
Metric17.20.6772
Metric17.30.6811
Metric17.40.685
Fractional inch17.4630.6875
Metric17.50.689
Metric17.60.6929
Metric17.70.6969
Metric17.80.7008
Fractional inch17.8590.7031
Metric17.90.7047
Metric180.7087
Metric18.10.7126
Metric18.20.7165
Fractional inch18.2560.7188
Metric18.30.7205
Metric18.40.7244
Metric18.50.7283
Metric18.60.7323
Fractional inch18.6530.7344
Metric18.70.7362
Metric18.80.7402
Metric18.90.7441
Metric190.748
Fractional inch19.050.75
Metric19.10.752
Metric19.20.7559
Metric19.30.7598
Metric19.40.7638
Fractional inch19.4470.7656
Metric19.50.7677
Metric19.60.7717
Metric19.70.7756
Metric19.80.7795
Fractional inch19.8440.7813
Metric19.90.7835
Metric200.7874
Fractional inch20.2410.7969
Fractional inch20.6380.8125
Fractional inch21.0340.8281
Fractional inch21.4310.8438
Fractional inch21.8280.8594
Fractional inch22.2250.875
Fractional inch22.6220.8906
Fractional inch23.0190.9063
Fractional inch23.4160.9219
Fractional inch23.8130.9375
Fractional inch24.2090.9531
Fractional inch24.6060.9688
Fractional inch25.0030.9844
Fractional inch25.41
Primary references

ASME B94.11M is the governing size-and-tolerance reference. The NBS and FAA publications are independent historical/conversion checks, not substitutes for a current drawing or supplier specification.

Estimate only:Confirm the actual drill diameter, tolerance, and process requirement before machining.

02 / Method & limits

Make the calculation checkable.

Reference method

Each designation maps to a nominal diameter; inch values use the exact 25.4 mm/in definition before display rounding.

Lookup example

Search a target diameter and compare the nearest published metric, fractional, number, and letter sizes.

Reference limits

  • Every series must be complete for its declared range.
  • Nominal size does not replace measured tool diameter or tolerance data.

03 / Related tools

MachiningTap Drill CalculatorEstimate tap-drill diameter and compare nearby standard drill sizes.ConversionUnit & Fraction ConverterConvert workshop units, decimals, fractional inches, and metric dimensions.