Imperial units of length
The calculator converts SI (metric) units of length to imperial units of length
Common units of length (imperial to metric)
Common units of length
 
Unit

Abbreviation 
Approximate conversion to metric system

Exact conversion to metric system
 


2.54 cm

 



 



 



 




Common units of length (metric to imperial)
Common units of length
 
Unit

Abbreviation 
Approximate conversion to imperial system

Exact conversion to metric system
 

cm  0.394 in 
0.393701 in  

m  3.281 ft  3.28084 ft  

km  0.62 mi  0.621371 mi  
Conversions between inches, feet, yards and miles:
 A foot is 12 (dozen) inches
 A yard is 36 inches or 3 feet
 A mile is 63 360 inches or 5280 feet or 1760 yards
Nautical units of length
Nautical units are also units of length, but are generally used for nautical or air transport.
A nautical minute corresponds to one minute of latitude.
Nautical units
 
Unit

Abbreviation

Approximate conversion to metric system 
Exact conversion to metric system  
fathom 
fm, fth

1.83 m

1.8288 m
 
cable (common) 
cbl

185 m

185.3184 m
 
cable (U.S. navy) 
cbl

219 m

219.456 m
 
nautical mile 
mi,m

1.85 km

1852 m
 
sea league 

5.56 km

5556 m

Imperial units of length questions and answers
Where are imperial units used?
Officially the imperial system is used by the USA, Myanmar and Liberia. However both Myanmar and Liberia are in on their way to switching to imperial. The UK officially uses the metric system, however people still use some units such as miles, pounds, gallon and pints, among others in every day life.
What were imperial units based on?
Originally the imperial system was based on the human body (e.g. inches were a thumb), but this does not work because obviously not every thumb is the same.