Drill Bit Size Calculator

Match drill bit sizes to inch fractions, decimal equivalents, and screw gauges for woodworking and metalworking.

Drill Bit Size Calculator

Fraction

5/32"

Decimal

0.15625"

Millimeters

3.97 mm

Screw Size

#6

Complete Drill Bit Size Chart

FractionDecimalMMScrew
1/16"0.0625"1.59#0
3/32"0.09375"2.38#1
1/8"0.125"3.18#4
5/32"0.15625"3.97#6
3/16"0.1875"4.76#8
7/32"0.21875"5.56#10
1/4"0.25"6.35#12
5/16"0.3125"7.945/16
3/8"0.375"9.533/8
7/16"0.4375"11.117/16
1/2"0.5"12.71/2

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