Machinery's Handbook, 31st Edition
2850
Square Measure and Conversion Factors Units of Area Table 16. Square Measure and Conversion Factors Metric System US System
1 square kilometer (km 2 ) = 100 hectares 1,000,000 square meters 0.3861 square mile 247.1 acres 1 hectare (ha) = 0.01 square kilometer 100 ares 10,000 square meters 2.471 acres 107,639 square feet 1 are (a) = 0.0001 square kilometer 100 square meters 0.0247 acre 1076.4 square feet 1 square meter (m 2 ) = 0.000001 square kilometer 100 square decimeters 10000 square centimeters 1,000,000 square millimeters 10.764 square feet 1.196 square yards 1 square decimeter (dm 2 ) = 100 square centimeters 1 square centimeter (cm 2 ) = 0.0001 square meter 100 square millimeters 0.001076 square foot 0.155 square inch 1 square millimeter (mm 2 ) = 0.01 square centimeter 1,000,000 square microns 0.00155 square inch 1 square micrometer (micron) ( μ m 2 ) = 1 3 10 − 12 square meter 0.000001 square millimeter 1 3 10 − 9 square inch 1549.997 square micro-inch
1 square mile (mi 2 ) = 640 acres 6400 square chains
2.5899 square kilometers 10 square chains 4840 square yards 43,560 square feet a square, 208.71 feet on a side 0.4046856 hectare 40.47 ares 4046.856 square meters
1 acre =
1 square chain = 16 square rods 484 square yards 4356 square feet 1 square rod = 30.25 square yards 272.25 square feet 625 square links 1 square yard (yd 2 ) = 9 square feet 1296 square inches
0.83612736 square meter 8361.2736 square centimeter 836,127.36 square millimeter 0.111111 square yard 144 square inches 0.09290304 square meter 929.0304 square centimeters 92,903.04 square millimeters 0.0007716 square yard 0.006944 square foot 0.00064516 square meter 6.4516 square centimeters 645.16 square millimeters 0.000001 square inch 0.00064516 square millimeter
1 square foot (ft 2 ) =
1 square inch (in 2 ) =
1 square mil (mil 2 ) =
1 square micro-inch ( μ in 2 ) = 1 3 10 − 12 square inch
0.00064516 square micrometer (micron)
Note : Figures in Bold indicate exact conversion values Measure Used for Diameters and Areas of Electric Wires
1 circular inch =
1 circular mil =
area of 1-inch diameter circle π ∕ 4 square inch 0.7854 square inch 5.067 square centimeters 1,000,000 circular mils
area of 0.001-inch diameter circle π ∕ 4 square mil
1 square inch =
1.2732 circular inches 1,273,239 circular mils
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