Length Unit ConverterInstant two-way conversion between cm, inch, meter, km and more

Why use a real-time, two-way length converter?

Metric units like centimeters, meters and kilometers still coexist worldwide with imperial units like inches, feet, yards and miles. Whether you're checking furniture dimensions from an overseas store, converting a suitcase's inch spec, or comparing a child's height to international charts, mentally converting cm to inches or meters to feet is error-prone. This tool lets you pick a unit and type a value on either side — the other side updates instantly, no "calculate" button required.

Whenever you change a unit, the tool automatically saves your last-used pair to the browser's localStorage, so the next visit starts right where you left off.

Common length conversion factors

• 1 centimeter (cm) = 10 millimeters (mm)
• 1 meter (m) = 100 centimeters (cm)
• 1 kilometer (km) = 1,000 meters (m)
• 1 inch (in) = 2.54 centimeters (cm)
• 1 foot (ft) = 12 inches (in) = 30.48 centimeters
• 1 yard (yd) = 3 feet (ft) = 0.9144 meters
• 1 mile = 1,760 yards (yd) = 1.609344 kilometers

Where metric and imperial units come from

The modern meter is defined by international agreement as part of the International System of Units (SI), while inches, feet, yards and miles belong to the imperial system, still widely used in the US and parts of the UK (home dimensions, height/weight, road distances). Knowing the exact ratios helps when shopping internationally, traveling abroad, or reading English technical specs.

Typical use cases

US-market monitors, furniture and clothing are often labeled in inches, while many other countries use centimeters and meters for room measurements and renovation planning; treadmill displays, maps and flight distances may mix miles and kilometers. Switch either side to any of the 8 supported units to cover everyday and professional conversion needs.