SPEC A150
January, 2008
Metric Conversion Factors
To Convert From Inches Millimeters
To Millimeters Inches
Multiply By 25.4 0.03937
Length
Inches Centimeters
Centimeters Inches
2.54 0.3937
Feet Meters
Meters Feet
0.3048 3.2808
kilofeet (1000 ft) kilometers Square Inches Square Millimeters
kilometers kilofeet (1000 ft) Square Millimeters Square Inches
0.3048 3.2808 645.16 0.00155
Square Inches Square Centimeters
Square Centimeters Square Inches
6.4516 0.155
Area
Square Inches Circular Mils
Circular Mils Square Inches
1,273,240 7.854 x 10-7
Circular Mils Square Millimeters
Square Millimeters Circular Mils
5.066 x 104 1973.51
Weight
Square Feet Square Meters Pounds Kilograms
Square Meters Square Feet Kilograms Pounds
0.0929 10.764 0.4536 2.2046
Pound/Kilofeet Kilograms/Kilometer Ohms/Kilofeet Ohms/Kilometer
Kilograms/Kilometer Pounds/Kilofeet Ohms/Kilometer Ohms/Kilofeet
1.4882 0.6720 3.2808 0.3048
Electrical
Microfarads/Kilofeet Microfarads/Kilometer
Microfarads/Kilometer Microfarads/Kilofeet
3.2808 0.3048
Mechanical
Insulation Resistance: Megohms—Kilofeet Megohms—Kilometer Pounds/Square Inch Kilo Pascal* Pounds (force)
Megohms—Kilometer Megohms—Kilofeet Kilo Pascal* Pounds/Square Inch Newtons
0.3048 3.2808 6.895 0.1432 4.448
* 1 Pascal = 1 newton/m2
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