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Metric Conversion Table

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Square Millimeters to Square Inches / Circular Mils

Square Millimeters Square Inches Circular Mils Square Millimeters Square Inches Circular Mils Square Millimeters Square Inches Circular Mils
1,000 1.550 1,974,000 - - - - - -
975 1.511 1,924,700 95 0.1472 187,530 9.5 0.01472 18,753
950 1.472 1,875,300 90 0.1395 177,660 9.0 0.01395 17,766
925 1.434 1,826,000 85 0.1317 167,790 8.5 0.01317 16,779
900 1.395 1,776,600 80 0.1240 157,920 8.0 0.01240 15,792
875 1.356 1,727,300 75 0.1163 148,050 7.5 0.01163 14,805
850 1.317 1,677,900 70 0.1085 138,180 7.0 0.01085 13,818
825 1.240 1,579,200 60 0.0930 118,440 6.0 0.00930 11,844
775 1.201 1,529,900 55 0.0853 108,570 5.5 0.00853 10,857
750 1.163 1,480,500 50 0.0775 98,700 5.0 0.00775 9,870
725 1.124 1,431,200 45 0.0698 88,830 4.75 0.00736 9,377
700 1.085 1,381,800 40 0.0620 78,960 4.50 0.00698 8,883
675 1.046 1,332,500 35 0.0542 69,090 4.25 0.00659 8,390
650 1.008 1,283,100 30 0.0465 59,220 4.00 0.00620 7,896
625 0.969 1,233,800 25 0.0388 49,350 3.75 0.00581 7,403
600 0.930 1,184,400 20 0.0310 39,480 3.50 0.00542 6,909
575 0.891 1,135,100 19.5 0.0302 38,490 3.25 0.00504 6,416
550 0.891 1,085,700 19.0 0.0294 37,510 3.00 0.00465 5,922
525 0.814 1,036,400 18.5 0.0287 35,530 2.75 0.00426 4,935
500 0.775 987,000 18.0 0.0279 35,530 2.50 0.00388 4,935
475 0.736 937,700 17.5 0.0271 34,550 2.25 0.00349 4,442
450 0.698 888,300 17.0 0.0264 33,560 2.00 0.00310 3,948
425 0.659 839,000 16.5 0.0256 32,560 1.75 0.00271 3,455
400 0.620 789,600 16.0 0.0248 31,580 1.50 0.00233 2,961
375 0.581 740,300 15.5 0.0240 30,600 1.25 0.00194 2,468
350 0.542 690,900 15.0 0.0233 29,610 1.00 0.00155 1,974
325 0.504 641,600 14.5 0.0225 28,620 0.90 0.00140 1,777
300 0.465 592,200 14.0 0.0217 27,640 0.80 0.00124 1,579
275 0.426 542,900 13.5 0.0209 26,650 0.75 0.00116 1,481
250 0.388 493,500 13.0 0.0201 26,650 0.70 0.00109 1,481
225 0.349 444,200 12.5 0.0194 24,680 0.60 0.000930 1,184
200 0.310 394,800 12.0 0.0186 23,690 0.50 0.000775 987
175 0.291 345,500 11.5 0.0178 22,700 - - -
150 0.233 296,100 11.0 0.0171 21,700 - - -
125 0.1938 246,800 10.5 0.0163 20,730 - - -
100 0.1550 197,400 10.0 0.0155 19,740 - - -

*Based on 1000 sq. mm = 1,974,000 circular mils.

 

Length Area Volume Mass
Inch x 25.40 = Millimeters Sq. Inch x 6.452 = Sq. Centimeter Cu. Inch x 16.39 = Cu. Centimeter Ounce x 28.35 = Gram
Millimeters x 0.03937 = Inches Sq. Centimeter x 0.1550 = Sq. Inch Cu. Centimeter x 0.06102 = Cu. Inch Gram x 0.03527 = Ounce
Feet x 0.3048 = Meters Sq. Foot x 0.0929 = Sq. Meter Cu. Foot x 0.02832 = Cu. Meter Pound x 0.4536 = Kilogram
Meters x 3.281 = Kilometers Sq. Meter x 10.76 = Sq. Foot Cu. Meter x 35.31 = Cu. Foot Kilogram x 2.205 = Pound
Miles x 1.609 = Kilometers Sq. Mile x 2.590 = Sq. Kilometer - Kilogram/km x 0.6214 = Pounds/kft
Kilometers x 0.6214 = Miles Sq. Kilometer x 0.3861 = Sq. Mile - Pounds/kft x 1.4881 = Kilogram/km
OHMS/km x 0.3048 = OHMS/kft Circular Mil x 0.7854 = Sq. Mil - -

Circular Mil Area (CMA) = (average strand size in Mils)2 x 1,000,000 x total number of strands

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