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ANSI (Imperial) and ISO Metric Drill Sizes
The first column gives the ANSI Number or Letter drill size and the second column gives the exact size in inches. The third column gives the closest available ISO Metric drill size (or fractional inch size) and finally the fourth column then gives the exact size in inches of this drill.

Example
#31 - The exact size is 0.1200 inches.
The closest ISO size is 3.00mm or 0.1181 inches.
Number or Letter SizeDiameter (Inches) Nearest Approved SizeDiameter (Inches)
800.0135 0.35mm0.0138
790.0145 0.38mm0.0150
780.0160 0.40mm0.0157
770.0180 0.45mm0.0177
760.0200 0.50mm0.0197
750.0210 0.52mm0.0205
740.0225 0.58mm0.0228
730.0240 0.60mm0.0236
720.0250 0.65mm0.0256
710.0260 0.65mm0.0256
700.0280 0.70mm0.0276
690.0292 0.75mm0.0295
680.0310 1/32"0.3120
670.0320 0.82mm0.0323
660.0330 0.85mm0.0335
650.0350 0.90mm0.0354
640.0360 0.92mm0.0362
630.0370 0.95mm0.0374
620.0380 0.98mm0.0386
610.0390 1.00mm0.0394
600.0400 1.00mm0.0394
590.0410 1.05mm0.0413
580.0420 1.05mm0.0413
570.0430 1.10mm0.0433
560.0465 3/64"0.0469
550.0520 1.30mm0.0512
540.0550 1.40mm0.0551
530.0595 1.50mm0.0591
520.0635 1.60mm0.0630
510.0670 1.70mm0.0669
500.0700 1.80mm0.0709
490.0730 1.85mm0.0728
480.0760 1.95mm0.0768
470.0785 2.00mm0.0787
460.0810 2.05mm0.0807
450.0820 2.10mm0.0827
440.0860 2.20mm0.0866
430.0890 2.25mm0.0886
420.0935 3/32"0.0938
410.0960 2.45mm0.0965
400.0980 2.50mm0.0984
390.0995 2.55mm0.1004
380.1015 2.60mm0.1024
370.1040 2.65mm0.1043
360.1065 2.70mm0.1063
350.1100 2.80mm0.1102
340.1110 2.80mm0.1102
330.1130 2.85mm0.1122
320.1160 2.95mm0.1161
310.1200 3.00mm0.1181
300.1285 3.30mm0.1299
290.1360 3.50mm0.1378
280.1405 9/64"0.1406
270.1440 3.70mm0.1457
260.1470 3.70mm0.1457
250.1495 3.80mm0.1496
240.1520 3.90mm0.1535
230.1540 3.90mm0.1535
220.1570 4.00mm0.1575
210.1590 4.10mm0.1614
200.1610 4.10mm0.1614
190.1660 4.20mm0.1654
180.1695 4.30mm0.1693
170.1730 4.40mm0.1732
160.1770 4.50mm0.1772
150.1800 4.60mm0.1811
140.1820 4.60mm0.1811
130.1850 4.70mm0.1850
120.1890 4.80mm0.1890
110.1910 4.90mm0.1929
100.1935 4.90mm0.1929
90.1960 5.00mm0.1969
80.1990 5.10mm0.2008
70.2010 5.10mm0.2008
60.2040 5.20mm0.2047
50.2055 5.20mm0.2047
40.2090 5.30mm0.2087
30.2130 5.40mm0.2126
20.2210 5.60mm0.2205
10.2280 5.80mm0.2283
A0.2340 15/64"0.2344
B0.2380 6.00mm0.2362
C0.2420 6.10mm0.2402
D0.2460 6.20mm0.2441
E0.2500 1/4"0.2500
F0.2570 6.50mm0.2559
G0.2610 6.60mm0.2598
H0.2660 17/64"0.2656
I0.2720 6.90mm0.2717
J0.2770 7.00mm0.2756
K0.2810 9/32"0.2812
L0.2900 7.40mm0.2913
M0.2950 7.50mm0.2953
N0.3020 7.70mm0.3031
O0.3160 8.00mm0.3150
P0.3230 8.20mm0.3228
Q0.3320 8.40mm0.3307
R0.3390 8.60mm0.3386
S0.3480 8.80mm0.3465
T0.3580 9.10mm0.3583
U0.3680 9.30mm0.3661
V0.3770 3/8"0.3750
W0.3860 9.80mm0.3858
X0.3970 10.10mm0.3976
Y0.4040 10.30mm0.4055
Z0.4130 10.50mm0.4134