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Drill Size Conversion Table

This table is the chart for converting and identifying various drill bit sizes. Because of differences in numbering systems, some conversions are approximated but are within .0001 inch. If all else fails, you may want to use our Tap Drill Size Calculator. The information available from our sources is usually sufficient for all computer related drill or screw requirements world wide.

Fract.
(in)
DecimalWire No.
/Letter
Metric
(mm)
Fract.
(in)
DecimalWire No.
/Letter
Metric
(mm)
Fract.
(in)
DecimalWire No.
/Letter
Metric
(mm)
 0.0098 0.25  0.106536   0.3480S 
 0.0118 0.30 7/640.1094    0.3543 9.00
 0.013580   0.110035   0.3580T 
 0.0138 0.35  0.1102 2.80 23/640.3594  
 0.014579   0.111034   0.3680U 
1/640.0156    0.113033   0.3740 9.50
 0.0157 0.40  0.1142 2.90 3/80.3750  
 0.016078   0.116032   0.3770V 
 0.0177 0.45  0.1181 3.00  0.3860W 
 0.018077   0.120031  25/640.3906  
 0.0197 0.50 1/80.1250    0.3937 10.00
 0.020076   0.128530   0.3970X 
 0.021075   0.136029   0.4040Y 
 0.0217 0.55  0.1378 3.50 13/320.4063  
 0.022574   0.140528   0.4130Z 
 0.0236 0.60 9/640.1406    0.4134 10.50
 0.024073   0.144027  27/640.4219  
 0.025072   0.147026   0.4331 11.00
 0.0256 0.65  0.149525  7/160.4375  
 0.026071   0.152024   0.4528 11.50
 0.0276 0.70  0.154023  29/640.4531  
 0.028070  5/320.1563   15/320.4688  
 0.029269   0.157022   0.4724 12.00
 0.0295 0.75  0.1575 4.00 31/640.4844  
 0.031068   0.159021   0.4921 12.50
1/320.0313    0.161020  1/20.5000  
 0.0315 0.80  0.166019   0.5118 13.00
 0.032067   0.169518  33/640.5156  
 0.033066  11/640.1719   17/320.5313  
 0.0335 0.85  0.173017   0.5315 13.50
 0.035065   0.177016  35/640.5469  
 0.0354 0.90  0.1772 4.50  0.5512 14.00
 0.036064   0.180015  9/160.5625  
 0.037063   0.182014   0.5709 14.50
 0.0374 0.95  0.185013  37/640.5781  
 0.038062  3/160.1875    0.5905 15.00
 0.039061   0.189012  19/320.5938  
 0.0394 1.00  0.191011  39/640.6094  
 0.040060   0.193510   0.6102 15.50
 0.041059   0.19609  5/80.6250  
 0.042058   0.1968 5.00  0.6299 16.00
 0.043057   0.19908  41/640.6406  
 0.0433 1.10  0.20107   0.6496 16.50
 0.046556  13/640.2031   21/320.6563  
3/640.0469    0.20406   0.6693 17.00
 0.0472 1.20  0.20555  43/640.6719  
 0.0512 1.30  0.20904  11/160.6875  
 0.052055   0.21303   0.6890 17.50
 0.055054   0.2165 5.50 45/640.7031  
 0.0551 1.40 7/320.2188    0.7087 18.00
 0.0591 1.50  0.22102  23/320.7188  
 0.059553   0.22801   0.7283 18.50
1/160.0625    0.2340A  47/640.7344  
 0.0630 1.60 15/640.2344    0.7480 19.00
 0.063552   0.2362 6.00 3/40.7500  
 0.0669 1.70  0.2380B  49/640.7656  
 0.067051   0.2420C   0.7677 19.50
 0.070050   0.2460D  25/320.7813  
 0.0709 1.80 1/40.2500E   0.7874 20.00
 0.073049   0.2559 6.50 51/640.7969  
 0.0748 1.90  0.2570F   0.8071 20.50
 0.076048   0.2610G  13/160.8125  
5/640.0781   17/640.2656    0.8268 21.00
 0.078547   0.2660H  53/640.8281  
 0.0787 2.00  0.2720I  27/320.8438  
 0.081046   0.2756 7.00  0.8465 21.50
 0.082045   0.2770J  55/640.8594  
 0.0827 2.10  0.2810K   0.8661 22.00
 0.086044  9/320.2813   7/80.8750  
 0.0866 2.20  0.2900L   0.8858 22.50
 0.089043   0.2950M  57/640.8906  
 0.0906 2.30  0.2953 7.50  0.9055 23.00
 0.093542  19/640.2969   29/320.9063  
3/320.0938    0.3020N  59/640.9219  
 0.0945 2.40 5/160.3125    0.9252 23.50
 0.096041   0.3150 8.00 15/160.9375  
 0.098040   0.3160O   0.9449 24.00
 0.0984 2.50  0.3230P  61/640.9531  
 0.099539  21/640.3281    0.9646 24.50
 0.101538   0.3320Q  31/320.9688  
 0.1024 2.60  0.3346 8.50  0.9842 25.00
 0.104037   0.3390R  63/640.9844  
 0.1063 2.70 11/320.3438   11.0000  
Fract.
(in)
DecimalWire No.
/Letter
Metric
(mm)
Fract.
(in)
DecimalWire No.
/Letter
Metric
(mm)
Fract.
(in)
DecimalWire No.
/Letter
Metric
(mm)
Version 1.0.1


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