Measurement Conversion

On this page we have provided a handy chart for converting fractional inches / decimal inches / millimeters. This chart is handy when installing lights and accessories on your Truck, Trailer, Implements or Construction Equipment.

Measurement Conversion Chart (Drill Bit Chart)

Fractional Inch Decimal Inch Millimeters Fractional Inch Decimal Inch Millimeters Fractional Inch Decimal Inch Millimeters
0.010 0.25 0.669 17 7 7.000 177.8
0.020 0.5 11/16 0.688 17.463 7-7/8 7.874 200
1/32 0.031 0.794 0.700 17.78 8 8.000 203.2
0.039 1 0.709 18 8.858 225
0.050 1.27 3/4 0.750 19 9 9.000 228.6
1/16 0.063 1.588 0.787 20 9.843 250
0.079 2 4/5 0.800 20.32 10 10.000 254
0.100 2.54 13/16 0.813 20.638 10.827 275
0.118 3 0.827 21 11 11.000 279.4
1/8 0.125 3.175 0.850 21.59 11.811 300
0.150 3.81 0.866 22 12 12.000 304.80
0.157 4 7/8 0.875 22.225 12.795 325
3/16 0.188 4.763 0.900 22.86 13 13.000 330.2
0.197 5 0.906 23 13.780 350
1/5 0.200 5.08 15/16 0.938 23.813 14 14.000 355.6
0.236 6 0.945 24 14.764 375
1/4 0.250 6.35 0.950 24.13 15 15.000 381
0.276 7 0.984 25 15-3/4 15.748 400
0.300 7.62 1 1.000 25.40 16 16.000 406.4
5/16 0.313 7.938 1-1/4 1.250 31.75 16.732 425
0.315 8 1-1/2 1.500 38.1 17 17.000 431.8
1/3 0.333 8.466 1-3/4 1.750 44.45 17.717 450
0.350 8.89 1.969 50 18 18.000 457.2
0.354 9 2 2.000 50.8 18.701 475
3/8 0.375 9.525 2-1/4 2.250 57.15 19.685 500
0.394 10 2-1/2 2.500 63.5 21 21.000 533.4
2/5 0.400 10.16 2-3/4 2.750 69.85 21.654 550
0.433 11 2.953 75 23.622 600
7/16 0.438 11.113 3 3.000 76.2 24 24.000 609.6
0.450 11.43 3-1/4 3.250 82.55 25.591 650
0.472 12 3-1/2 3.500 88.9 27.559 700
1/2 0.500 12.7 3-3/4 3.750 95.25 29.528 750
0.512 13 3-15/16 3.937 100 30 30.000 762
0.550 13.97 4 4.000 100.6 31-1/2 31.496 800
0.551 14 4-1/4 4.250 107.95 33.465 850
9/16 0.563 14.288 4-1/2 4.500 114.3 35.433 900
0.591 15 4-3/4 4.750 120.65 36 36.000 914.4
3/5 0.600 15.24 4.921 125 37.402 950
5/8 0.625 15.875 5 5.000 127 Inches Feet Meters
0.630 16 5.906 150 39.3701 3.28084 1 meter
0.650 16.5 6 6.000 152.4 196.850 16.4042 5 meters
2/3 0.666 16.933 6.890 175 393.701 32.8084 10 meters