Online Length Unit Converter
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About the Online Length Unit Converter
Tool Introduction
This tool supports real-time conversion between 27 common length units from the metric system, traditional Chinese shizhi, British/US systems, and astronomical units. Whether for daily life conversion (meter ↔ shichi), engineering drawing dimensions (millimeter ↔ inch), architectural design (shizhang ↔ meter), or astronomical distance estimation (light-year ↔ kilometer), enter a value to get an accurate result immediately.
Metric units (International System of Units)
Nanometer (nm), micrometer (μm), millimeter (mm), centimeter (cm), decimeter (dm), meter (m), kilometer (km). Decimal-based international standard units, widely used in science, engineering, and daily life. 1 kilometer = 1000 meters, 1 meter = 100 centimeters = 1000 millimeters.
Traditional Chinese shizhi units
Shili, shizhang, shichi, shicun, shifen, shili, shihao. Traditional Chinese weights and measures continue to this day: 1 shili = 500 meters, 1 shizhang = 10/3 meters ≈ 3.333 meters, 1 shichi = 1/3 meter ≈ 0.333 meters, 1 shicun = 1/30 meter ≈ 0.0333 meters. Shizhi units use the decimal system (1 zhang = 10 chi, 1 chi = 10 cun, 1 cun = 10 fen) and are still widely used in traditional industries, Chinese medicine prescriptions, fabric cutting, calligraphy, and painting.
British/US units
Mil, inch (in), foot (ft), yard (yd), rod, chain, furlong, mile (mi), fathom, nautical mile (nmi), league. British units are widely used in engineering, construction, navigation, and aviation in the UK and US. 1 inch = 25.4 millimeters, 1 foot = 12 inches = 0.3048 meters, 1 mile = 5280 feet = 1609.344 meters, 1 nautical mile = 1852 meters, 1 fathom = 6 feet.
Astronomical units
Astronomical unit (AU): 1 AU ≈ 1.49598×10¹¹ meters, the average distance from Earth to the Sun. Light-year (ly): 1 ly ≈ 9.4607×10¹⁵ meters, the distance light travels in a vacuum in one year. These units are often used to describe distances between planets, stars, and galaxies.
Privacy and Security
All conversion logic is performed locally in your browser; no values are uploaded to a server. You can use it with confidence, without worrying about data leaks.
Tips
1. After entering any value, all units are automatically converted in real time; 2. Click the circular button in the middle to swap the source and target units with one click; 3. The common conversions section provides typical scenarios for one-click switching; 4. The conversion result can be copied as a pure number by clicking the clipboard icon, or as the full "value + unit" expression; 5. The reference table is grouped by unit type for quick location.