1 angstrom¹(light wave measurement)

0.1 millimicron
0.000 1 micron
0.000 000 1 millimeter
0.000 000 004 inch

1 cable's length

120 fathoms
720 feet
219.456 meters

1 centimeter

0.3937 inch

1 chain (Gunter's or
  surveyor's)

66 feet
20.1168 meters

1 decimeter

3.937 inches

1 dekameter

32.808 feet

1 fathom

6 feet
1.8288 meters

1 foot

0.3048 meter

1 furlong

10 chains (surveyor's)
660 feet
220 yards
¹/8 statute mile
201.168 meters

1 inch

2.54 centimeters

1 kilometer

0.621 mile

1 league (land)

3 statute miles
4.828 kilometers

1 link (Gunter's or
  surveyor's)

7.92 inches
0.201 168 meter

1 meter

39.37 inches
1.094 yards

1 micron

0.001 millimeter
0.000 039 37 inch

1 mil

0.001 inch
0.025 4 millimeter

1 mile (statute or
  land)

5,280 feet
1.609 kilometers

1 mile (nautical
  international)

1.852 kilometers
1.151 statute miles
0.999 U.S. nautical miles

1 millimeter

0.03937 inch

1 millimicron (m+GRKm)

0.001 micron
0.000 000 039 37 inch

1 nanometer

0.001 micrometer or
0.000 000 039 37 inch

1 point (typography)

0.013 837 inch
¹/72 inch (approximately)
0.351 millimeter

1 rod, pole, or perch

16¹/2 feet
5.0292 meters

1 yard

0.9144 meter

1 acre

43,560 square feet
4,840 square yards
0.405 hectare

1 are

119.599 square yards
0.025 acre

1 hectare

2.471 acres

1 square centimeter

0.155 square inch

1 square decimeter

15.5 square inches

1 square foot

929.030 square centimeters

1 square inch

6.4516 square centimeters

1 square kilometer

0.386 square mile
247.105 acres

1 square meter

1.196 square yards
10.764 square feet

1 square mile

258.999 hectares

1 square millimeter

0.002 square inch

1 square rod, square pole or square perch

25.293 square meters

1 square yard

0.836 square meters