Reference Charts
Fractions to decimals to millimeters conversion chart
Use the chart to convert fractions of an inch to decimals and millimeters.
| Fraction | Decimals | Millimeters |
|---|---|---|
| Fraction | Decimals | Millimeters |
| 1/64 | .0156 | .3969 |
| 1/32 | .0313 | .7938 |
| 3/64 | .0469 | 1.1906 |
| 1/16 | .0625 | 1.5875 |
| 5/64 | .0781 | 1.9844 |
| 3/32 | .0938 | 2.3813 |
| 7/64 | .1094 | 2.7781 |
| 1/8 | .125 | 3.1750 |
| 9/64 | .1406 | 3.5719 |
| 5/32 | .1563 | 3.9688 |
| 11/64 | .1719 | 4.3656 |
| 3/16 | .1875 | 4.7625 |
| 13/64 | .2031 | 5.1594 |
| 7/32 | .2188 | 5.5563 |
| 15/64 | .2344 | 5.9531 |
| 1/4 | .250 | 6.3500 |
| 17/64 | .2656 | 6.7469 |
| 9/32 | .2813 | 7.1438 |
| 19/64 | .2969 | 7.5406 |
| 5/16 | .3125 | 7.9375 |
| 21/64 | .3281 | 8.3344 |
| 11/32 | .3438 | 8.7313 |
| 23/64 | .3594 | 9.1281 |
| 3/8 | .375 | 9.5250 |
| 25/64 | .3906 | 9.9219 |
| 13/32 | .4063 | 10.3188 |
| 27/64 | .4219 | 10.7156 |
| 7/16 | .4375 | 11.1125 |
| 29/64 | .4531 | 11.5094 |
| 15/32 | .4688 | 11.9063 |
| 31/64 | .4844 | 12.3031 |
| 1/2 | .500 | 12.7000 |
| Fraction | Decimals | Millimeters |
|---|---|---|
| Fraction | Decimals | Millimeters |
| 33/64 | .5156 | 13.0969 |
| 17/32 | .5313 | 13.4938 |
| 35/64 | .5499 | 13.8906 |
| 9/16 | .5625 | 14.2875 |
| 37/64 | .5781 | 14.6844 |
| 19/32 | .5938 | 15.0813 |
| 39/64 | .6094 | 15.4781 |
| 5/8 | .625 | 15.8750 |
| 41/64 | .6406 | 16.2719 |
| 21/32 | .6563 | 16.6688 |
| 43/64 | .6719 | 17.0656 |
| 11/16 | .6875 | 17.4625 |
| 45/64 | .7031 | 17.8594 |
| 23/32 | .7188 | 18.2563 |
| 47/64 | .7344 | 18.6531 |
| 3/4 | .750 | 19.0500 |
| 49/64 | .7656 | 19.4469 |
| 25/32 | .7813 | 19.8438 |
| 51/64 | .7969 | 20.2406 |
| 13/16 | .8125 | 20.6375 |
| 53/64 | .8281 | 21.0344 |
| 27/32 | .8438 | 21.4313 |
| 55/64 | .8594 | 21.8281 |
| 7/8 | .875 | 22.2250 |
| 57/64 | .8906 | 22.6219 |
| 29/32 | .9063 | 23.0188 |
| 59/64 | .9219 | 23.4156 |
| 15/16 | .9375 | 23.8125 |
| 61/64 | .9531 | 24.2094 |
| 31/32 | .9688 | 24.6063 |
| 63/64 | .9844 | 25.0031 |
| 1 | 1.00 | 25.400 |
Use the chart to determine the thickness in inches and the weight for various gauges.
| Gauge Number |
Nominal Thickness |
Tolerance Hr-Hr P&O |
Tolerance Cold Roll |
Lbs. Per Sq. Ft. |
|---|---|---|---|---|
| Min. - Max. | Min. - Max. | |||
| 1" | 1.000 | .990 - 1.03 | 40.84 | |
| 3/4 | .7500 | .740 - .780 | 30.63 | |
| 5/8 | .6250 | .615 - .655 | 25.52 | |
| 1/2 | .5000 | .490 - .530 | 20.42 | |
| 3/8 | .3750 | .365 - .405 | 15.31 | |
| 5/16 | .3125 | .302 - .342 | 12.76 | |
| 1/4 | .2500 | .240 - .280 | 10.21 | |
| 3/16 | .1875 | .177 - .217 | 7.66 | |
| Sheet Tolerances | ||||
| 4 | .224 | .217 - .233 | 9.375 | |
| 5 | .209 | .202 - .218 | 8.750 | |
| 6 | .194 | .186 - .203 | 8.125 | |
| 7 | .179 | .171 - .187 | 7.500 | |
| 8 | .164 | .156 - .172 | 6.875 | |
| 9 | .149 | .141 - .157 | 6.250 | |
| 10 | .134 | .126 - .142 | .128 - .140 | 5.625 |
| 11 | .119 | .112 - .128 | .114 - .126 | 5.000 |
| 12 | .104 | .097 - .113 | .099 - .111 | 4.375 |
| 13 | .089 | .083 - .097 | .085 - .095 | 3.750 |
| 14 | .074 | .068 - .082 | .070 - .080 | 3.125 |
| 15 | .067 | .060 - .074 | .062 - .072 | 2.812 |
| 16 | .059 | .053 - .067 | .055 - .065 | 2.500 |
| 17 | .054 | .048 - .060 | .050 - .058 | 2.250 |
| 18 | .048 | .042 - .054 | .044 - .052 | 2.000 |
| 19 | .041 | .038 - .046 | 1.750 | |
| 20 | .036 | .033 - .039 | 1.500 | |
| 21 | .032 | .030 - .036 | 1.375 | |
| 22 | .030 | .027 - .033 | 1.250 | |
| 23 | .026 | .024 - .030 | 1.125 | |
| 24 | .024 | .021 - .027 | 1.000 | |
| 25 | .020 | .018 - .024 | .875 | |
| 26 | .018 | .016 - .020 | .750 | |
| 27 | .016 | .014 - .018 | .688 | |
| 28 | .015 | .013 - .017 | .625 | |
Use the chart to convert standard gauge numbers in decimals of an inch for sheet steel, strip and tubing, aluminum and stainless steel.
| Gauge | Strip & Tubing | US Standard | Sheet Steel | Steel Wire | Galvanized |
|---|---|---|---|---|---|
| Stainless | |||||
| 6/0 5/0 4/0 3/0 2/0 |
---- .500 .454 .425 .380 |
.4687 .4375 .4062 .3750 .3437 |
---- ---- ---- ---- ---- |
.4615 .4305 .3938 .3626 .3310 |
|
| 0 1 2 3 4 5 |
.340 .300 .284 .259 .238 .220 |
.3125 .2812 .2656 .2500 .2344 .2187 |
---- ---- ---- .2391 .2242 .2092 |
.3065 .2830 .2625 .2437 .2253 .2070 |
|
| 6 7 8 9 10 11 |
.203 .180 .165 .148 .134 .120 |
.2031 .1875 .1719 .1562 .1406 .1250 |
.1943 .1793 .1644 .1495 .1345 .1196 |
.1920 .1770 .1620 .1483 .1350 .1205 |
.1681 .1532 .1382 .1233 |
| 12 13 14 15 16 17 |
.109 .095 .083 .072 .065 .058 |
.1094 .0937 .0781 .0703 .0625 .0562 |
.1046 .0897 .0747 .0673 .0598 .0538 |
.1055 .0915 .0830 .0720 .0625 .0540 |
.1084 .0934 .0785 .0710 .0635 .0575 |
| 18 19 20 21 22 23 |
.049 .042 .035 .032 .028 .025 |
.0500 .0437 .0375 .0344 .0312 .0281 |
.0478 .0418 .0359 .0329 .0299 .0269 |
.0475 .0410 .0348 .0348 .0286 .0258 |
.0516 .0456 .0396 .0396 .0336 .0306 |
| 24 25 26 27 28 29 |
.022 .020 .018 .016 .014 .013 |
.0250 .0219 .0187 .0172 .0156 .0141 |
.0239 .0209 .0179 .0164 .0149 .0135 |
.0230 .0204 .0181 .0173 .0162 .0150 |
.0276 .0247 .0127 .0202 .0187 .0172 |
| 30 31 32 33 34 35 36 37 38 |
.012 .010 .009 .008 .007 .005 .004 ---- ---- |
.0125 .0109 .0102 .0094 .0086 .0078 .0070 .0066 .0062 |
.0120 .0105 .0097 .0090 .0082 .0075 .0067 .0064 .0060 |
.0140 .0132 .0128 .0118 .0104 .0095 .0090 .0085 .0080 |
.0157 .0142 .0134 |