ARMY TM 9-2815-260-24 AIR FORCE TO 38G1-126-2 MARINE CORPS TM 09244A/09245A-24 F-4 TABLE F-1.  METRIC CONVERSION Part I.  Fractional Equivalent Fractional Inches Decimal Inches mm 1/16 .0625 1.587 1/8 .1250 3.175 3/16 .1875 4.762 1/4 .2500 6.350 5/16 .3125 7.937 3/8 .3750 9.525 7/16 .4375 11.112 1/2 .5000 12.700 9/16 .5625 14.287 5/8 .6250 15.875 11/16 .6875 17.462 3/4 .7500 19.050 13/16 .8125 20.637 7/8 .8750 22.225 15/16 .9375 23.812 1 1 25.400 Part II.  Inches to Centimeters Inches cm 1 2.540 2 5.080 3 7.620 4 10.160 5 12.700 6 15.240 7 17.780 8 20.320 9 22.860 10 25.400 20 50.800 30 76.200 40 101.600 50 127.000 60 152.400 70 177.800 80 203.200 90 228.600 100 254.000