Length Converter

Free Online Length Converter

This tool supports conversion between common length units including meter, kilometer, centimeter, millimeter, mile, yard, foot, inch, nautical mile, micrometer, and nanometer. Enter a value in any unit to see results in all other units in real time. All data is processed locally in your browser — nothing is uploaded to any server, fully protecting your privacy.

Features

• Supports 11 common length unit conversions
• Covers metric, imperial, and nautical units
• All units displayed simultaneously with real-time sync
• Automatic scientific notation for very large or small values
• One-click copy of conversion results
• Pure frontend offline processing, protects user privacy

Common Conversion Formulas

• 1 km = 1000 m
• 1 mi = 1.609344 km
• 1 ft = 0.3048 m
• 1 in = 2.54 cm
• 1 nmi = 1852 m

Common Reference Values

• 1 mile ≈ 1.609 kilometers
• 1 foot ≈ 30.48 centimeters
• 1 inch ≈ 2.54 centimeters
• 1 nautical mile ≈ 1.852 kilometers
• Speed of light ≈ 3×10⁸ m/s

How to Use

1. 1Click on any unit card's input field
2. 2Enter a value, other units update in real time
3. 3Click the copy button to copy conversion results