This is the length and distance all-in-one calculator. Choose the desired length unit you want to convert, fill in the number and you will immediattely get the conversion to mm, cm, m, km, inches, feet, yards, miles and nautical miles. And recently I even added light-years.
In the US the use yards and miles. In most European countries they use meters and kilometers. At sea the use naitical miles. If you need to knwow how many mm one inch is or how many meters one nautical mile is this is the right place. Find a suitable conversion table or calculator above and you will soon have the answer.