Length and distance converter

Metric system — international decimal system of units based on the metre as the main unit of length.

American/English system — system of measures used in the USA and some other countries, based on English units.

British imperial system — system of measures used in the British Empire, differing from the American system in some values.

International nautical units — units used in international maritime navigation, based on the meridian arc length.

US nautical units — nautical units used in the USA, differing from international standards.

British nautical units — historical nautical units used in the British Navy.

Russian system of measures — system of measures traditionally used in Rus and the Russian Empire before the metric system.

Chinese units — traditional Chinese units of length used before the metric system.

Japanese units — traditional Japanese units of length partially derived from the Chinese system.

Arabic units — traditional Arabic units of length used in the medieval Islamic world.

Ancient Greek units — units of length used in Ancient Greece.

Ancient Roman units — units of length used in Ancient Rome.