Length Converters
Convert between metric and imperial length units: centimeters, inches, meters, feet, kilometers, miles, millimeters, and yards.
All length converters
CM to Inches
1 cm = 0.393701 in
Inches to CM
1 in = 2.54 cm
Meters to Feet
1 m = 3.28084 ft
Feet to Meters
1 ft = 0.3048 m
KM to Miles
1 km = 0.621371 mi
Miles to KM
1 mi = 1.60934 km
MM to Inches
1 mm = 0.0393701 in
Inches to MM
1 in = 25.4 mm
Yards to Meters
1 yd = 0.9144 m
Meters to Yards
1 m = 1.09361 yd
Feet to Inches
1 ft = 12 in
Inches to Feet
1 in = 0.0833333 ft
About length units
Length measures distance, and two systems dominate everyday use. The metric system (millimeter, centimeter, meter, kilometer) is decimal — each step is a factor of ten — and is the standard almost everywhere for science, engineering, and daily life. The imperial and US customary system (inch, foot, yard, mile) survives in the United States and, for specific uses like road distances and personal height, in the United Kingdom.
Since the International Yard and Pound Agreement of 1959, the two systems are locked together exactly: one inch is defined as 2.54 centimeters, one yard as 0.9144 meters. Every converter on this page uses those exact legal definitions, so results are limited only by display rounding — never by an approximate factor.