Decimal Equivalents for Drill Sizes


inch decimal equivalents
metric sizes
fractional sizes
number sizes
letter sizes



Decimal Equivalents from # 80 to 1", .0135" to 1.000"

Drill Decimal Drill Decimal Drill Decimal Drill Decimal Drill Decimal
80 .0135" 70 .0280" 60 .0400" 51 .0670" 3/32 .0938"
79 .0145" 69 .0292" 59 .0410" 50 .0700" 41 .0960"
1/64 .0156" 68 .0310" 58 .0420" 49 .0730" 40 .0980"
78 .0160" 1/32 .0313" 57 .0430" 48 .0760" 39 .0995"
77 .0180" 67 .0320" 56 .0465" 5/64 .0781" 38 .1015"
76 .0200" 66 .0330" 3/64 .0469" 47 .0785" 37 .1040"
75 .0210" 65 .0350" 55 .0520" 46 .0810" 36 .1065"
74 .0225" 64 .0360" 54 .0550" 45 .0820" 7/64 .1094"
73 .0240" 63 .0370" 53 .0595" 44 .0860" 35 .1100"
72 .0250" 62 .0380" 1/16 .0625" 43 .0890" 34 .1110"
71 .0260" 61 .0390" 52 .0635" 42 .0935" 33 .1130"


Drill Decimal Drill Decimal Drill Decimal Drill Decimal Drill Decimal
32 .1160" 23 .1540" 14 .1820" 5 .2055" E .2500"
31 .1200" 5/32 .1562" 13 .1850" 4 .2090" 1/4 .2500"
1/8 .1250" 22 .1570" 3/16 .1875" 3 .2130" F .2570"
30 .1285" 21 .1590" 12 .1890" 7/32 .2188" G .2610"
29 .1360" 20 .1610" 11 .1910" 2 .2210" 17/64 .2656"
28 .1405" 19 .1660" 10 .1935" 1 .2280" H .2660"
9/64 .1406" 18 .1695" 9 .1960" A .2340" I .2720"
27 .1440" 11/64 .1719" 8 .1990" 15/64 .2344" J .2770"
26 .1470" 17 .1730" 7 .2010" B .2380" K .2810"
25 .1495" 16 .1770" 13/64 .2031" C .2420" 9/32 .2812"
24 .1520" 15 .1800" 6 .2040" D .2460" L .2900"


Drill Decimal Drill Decimal Drill Decimal Drill Decimal Drill Decimal
M .2950" 23/64 .3594" 29/64 .4531" 41/64 .6406" 53/64 .8281"
19/64 .2969" U .3680" 15/32 .4688" 21/32 .6562" 27/32 .8438"
N .3020" 3/8 .3750" 31/64 .4844" 43/64 .6719" 55/64 .8594"
5/16 .3125" V .3770" 1/2 .5000" 11/16 .6875" 7/8 .8750"
O .3160" W .3860" 33/64 .5156" 45/64 .7031" 57/64 .8906"
P .3230" 25/64 .3906" 17/32 .5313" 23/32 .7188" 29/32 .9062"
21/64 .3281" X .3970" 35/64 .5469" 47/64 .7344" 59/64 .9219"
Q .3320" Y .4040" 9/16 .5625" 3/4 .7500" 15/16 .9375"
R .3390" 13/32 .4062" 37/64 .5781" 49/64 .7656" 61/64 .9531"
11/32 .3438" Z .4130 19/32 .5938" 25/32 .7812" 31/32 .9688"
S .3480" 27/64 .4219" 39/64 .6094" 51/64 .7969" 63/64 .9844"
T .3580" 7/16 .4375" 5/8 .6250" 13/16 .8125" 1 1.000"

 



Millimeter Sizes

Decimal Equivalents

mm Decimal mm Decimal mm Decimal mm Decimal mm Decimal
.35 .0138" .90 .0354" 1.45 .0571" 2.00 .0787" 2.55 .1004"
.40 .0157" .95 .0374" 1.50 .0591" 2.05 .0807" 2.60 .1024"
.45 .0177" 1.0 .0394" 1.55 .0610" 2.10 .0827" 2.65 .1043"
.50 .0197" 1.05 .0413" 1.60 .0630" 2.15 .0846" 2.70 .1063"
.55 .0217" 1.10 .0433" 1.65 .0650" 2.20 .0866" 2.75 .1083"
.60 .0236" 1.15 .0453" 1.70 .0669" 2.25 .0886'' 2.80 .1102"
.65 .0256" 1.20 .0472" 1.75 .0689" 2.30 .0906" 2.85 .1142"
.70 .0276" 1.25 .0492" 1.80 .0709" 2.35 .0925" 2.90 .1181"
.75 .0295" 1.30 .0512" 1.85 .0728" 2.40 .0945" 3.00 .1181"
.80 .0315" 1.35 .0531" 1.90 .0748" 2.45 .0965" 3.10 .1220"
.85 .0335" 1.40 .0551" 1.95 .0768" 2.50 .0984" 3.20 .1260"

 



mm Decimal mm Decimal mm Decimal mm Decimal mm Decimal
3.25 .1280" 4.1 .1614" 4.9 .1929" 5.75 .2264" 6.6 .2598"
3.30 .1299" 4.2 .1654" 5 .1969" 5.8 .2283" 6.7 .2638"
3.40 .1339" 4.25 .1673" 5.1 .2008" 5.9 .2323" 6.75 .2657"
3.50 .1378" 4.3 .1693" 5.2 .2047" 6 .2362" 6.8 .2677"
3.6 .1417" 4.4 .1732" 5.25 .2067" 6.1 .2402" 6.9 .2717"
3.7 .1457" 4.5 .1772" 5.3 .2087" 6.2 .2441" 7 .2756"
3.75 .1476" 4.6 .1811" 5.4 .2126" 6.25 .2461" 7.1 .2795"
3.8 .1496" 4.7 .1850" 5.5 .2165" 6.3 .2480" 7.2 .2835"
3.9 .1535" 4.75 .1870" 5.6 .2205" 6.4 .2520" 7.25 .2854"
4 .1575" 4.8 .1890" 5.7 .2244" 6.5 .2559" 7.3 .2874"



mm Decimal mm Decimal mm Decimal mm Decimal mm Decimal
7.4 .2913" 8.25 .3248" 9.1 .3583" 9.9 .3898" 14.5 .5709"
7.5 .2953" 8.3 .3268" 9.2 .3622" 10 .3937" 15 .5906"
7.6 .2992" 8.4 .3307" 9.25 .3642" 10.5 .4134" 15.5 .6102"
7.7 .3031" 8.5 .3346" 9.3 .3661" 11 .4331" 16 .6229"
7.75 .3051" 8.6 .3386" 9.4 .3701" 11.5 .4528" 16.5 .6496"
7.8 .3071" 8.7 .3425" 9.5 .3740" 12 .4724" 17 .6693"
7.9 .3110" 8.75 .3445" 9.6 .3780" 12.5 .4921" 17.5 .6890"
8 .3150" 8.8 .3465" 9.7 .3819" 13 .5118" 18 .7087"
8.1 .3189" 8.9 .3504" 9.75 .3839" 13.5 .5315" 18.5 .7283"
8.2 .3228" 9 .3543" 9.8 .3858" 14 .5512" 19 .7480"



mm Decimal mm Decimal mm Decimal
19.5 .7677" 21.5 .8465" 23.5 .9252"
20 .7874" 22 .8661" 24 .9449"
20.5 .8071" 22.5 .8858" 24.5 .9646"
21 .8268" 23 .9055" 25 .9843"

 



FRACTIONAL DECIMAL EQUIVALENTS
1/64 0.015625 17/64 0.265625 33/64 0.515625 49/64 0.765625
1/32 0.03125 9/32 0.28125 17/32 0.53125 25/32 0.78125
3/64 0.046875 19/64 0.296875 35/64 0.546875 51/64 0.796875
1/16 0.0625 5/16 0.3125 9/16 0.5625 13/16 0.8125
5/64 0.078125 21/64 0.328125 37/64 0.578125 53/64 0.828125
3/32 0.09375 11/32 0.34375 19/32 0.59375 27/32 0.84375
7/64 0.109375 23/64 0.359375 39/64 0.609375 55/64 0.859375
1/8 0.125 3/8 0.375 5/8 0.625 7/8 0.875
9/64 0.140625 25/64 0.390625 41/64 0.640625 57/64 0.890625
5/32 0.15625 13/32 0.40625 21/32 0.65625 29/32 0.90625
11/64 0.171875 27/64 0.421875 43/64 0.671875 59/64 0.921875
3/16 0.1875 7/16 0.4375 11/16 0.6875 15/16 0.9375
13/64 0.203125 29/64 0.453125 45/64 0.703125 61/64 0.953125
7/32 0.21875 15/32 0.46875 23/32 0.71875 31/32 0.96875
15/64 0.234375 31/64 0.484375 47/64 0.734375 63/64 0.984375
1/4 0.250 1/2 0.500 3/4 0.750 1 1.000



 

NUMBER DRILL SIZES
No. Size of No. in Decimals No. Size of No. in Decimals No. Size of No. in Decimals No. Size of No. in Decimals
1 0.2280 21 0.1590 41 0.0960 61 0.0390
2 0.2210 22 0.1570 42 0.0935 62 0.0380
3 0.2130 23 0.1540 43 0.0890 63 0.0370
4 0.2090 24 0.1520 44 0.0860 64 0.0360
5 0.2055 25 0.1495 45 0.0820 65 0.0350
6 0.2040 26 0.1470 46 0.0810 66 0.0330
7 0.2010 27 0.1440 47 0.0785 67 0.0320
8 0.1990 28 0.1405 48 0.0760 68 0.0310
9 0.1960 29 0.1360 49 0.0730 69 0.02925
10 0.1935 30 0.1285 50 0.0700 70 0.0280
11 0.1910 31 0.1200 51 0.0670 71 0.0260
12 0.1890 32 0.1160 52 0.0635 72 0.0250
13 0.1850 33 0.1130 53 0.0595 73 0.0240
14 0.1820 34 0.1110 54 0.0550 74 0.0225
15 0.1800 35 0.1100 55 0.0520 75 0.0210
16 0.1770 36 0.1065 56 0.0465 76 0.0200
17 0.1730 37 0.1040 57 0.0430 77 0.0180
18 0.1695 38 0.1015 58 0.0420 78 0.0160
19 0.1660 39 0.0995 59 0.0410 79 0.0145
20 0.1610 40 0.0980 60 0.0400 80 0.0135

 



LETTER DRILL SIZE
A 0.234 N 0.302
B 0.238 O 0.316
C 0.242 P 0.323
D 0.246 Q 0.332
E 0.250 R 0.339
F 0.257 S 0.348
G 0.261 T 0.358
H 0.266 U 0.368
I 0.272 V 0.377
J 0.277 W 0.386
K 0.281 X 0.397
L 0.290 Y 0.404
M 0.295 Z 0.413




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