Free Online Length Converter β Convert Any Distance Unit Instantly
Convert between meters, feet, inches, kilometers, miles, yards, centimeters, and more with this fast, accurate length conversion tool. Supports 12 units across metric, imperial, and scientific systems.
Convert Your Length Measurement
How to Use This Length Converter
Enter Your Value
Type the numeric value you want to convert into the input field. Use decimals for precision if needed.
Select the Source Unit
Choose the unit you are converting from using the From Unit dropdown menu. Options include meters, feet, kilometers, miles, and more.
Select the Target Unit
Choose the unit you want to convert to using the To Unit dropdown menu. Pick any of the 12 supported length units.
Click Convert
Press the Convert button or hit Enter to see the result instantly. The converted value appears below with full precision.
Copy or Reset
Use the Copy Result button to copy the converted value to your clipboard, or click Clear to start a new conversion.
Key Features of Length Converter
100% Free Length Conversion
Convert between any length units without limits, signups, or hidden charges β completely free forever.
Supports 12 Length Units
From nanometers to light years, covering metric, imperial, nautical, and scientific measurement systems.
Instant Real-Time Results
Conversions calculate in under a millisecond with a full reference table showing all unit equivalents at once.
Swap Units in One Click
Quickly reverse the conversion direction with the swap button β no need to re-select units manually.
Privacy-Safe Browser Tool
Every calculation runs locally in your browser. Zero data transmission, zero tracking, zero server involvement.
Mobile-Friendly Responsive Design
Optimized for smartphones, tablets, and desktops with touch-friendly controls and adaptive layouts.
How This Length Converter Works
Result = Input Value Γ (Source Unit in Meters Γ· Target Unit in Meters)Each unit has a fixed conversion factor to meters (the SI base unit). The tool converts your input to meters first, then from meters to the target unit.
Conversion Reference Factors (to 1 Meter)
Example: Converting 5 feet to centimeters: 5 Γ 0.3048 = 1.524 meters, then 1.524 Γ 100 = 152.4 centimeters. This is the standard approach used internationally wherever precise length conversion is required.
Assumptions: All conversion factors follow the International System of Units (SI) and the international yard and pound agreement of 1959. The light year value uses the IAU definition of 9,460,730,472,580,800 meters exactly.
Practical Examples
Height Conversion for Indian Passport
Input: 5 feet 6 inches (66 inches total)
Result: 167.64 centimeters
Use Case: Indian passport and Aadhaar applications require height in centimeters. Convert your height measured in feet-inches to the required cm format.
Road Distance: Delhi to Mumbai
Input: 1,400 kilometers
Result: 869.919 miles
Use Case: Useful when planning a road trip and comparing distances with international references or using GPS apps that display miles.
Fabric Measurement for Tailoring
Input: 2.5 yards
Result: 228.6 centimeters (2.286 meters)
Use Case: Fabric in India is often sold in meters, but patterns from the US or UK specify yards. Convert accurately before purchasing cloth.
Marathon Distance in Different Units
Input: 26.2188 miles (marathon distance)
Result: 42.195 kilometers
Use Case: Runners training for marathons internationally can convert the official marathon distance between imperial and metric for pace calculations.
What Is a Length Converter?
A length converter is a measurement tool that transforms a distance or length value from one unit of measurement to another. Whether you need to convert meters to feet for a construction project, kilometers to miles for travel planning, or inches to centimeters for online shopping, this tool handles it instantly with precise, standardized conversion factors.
This tool is designed for students solving physics and math problems, professionals in engineering and construction who work across metric and imperial systems, shoppers comparing product dimensions listed in unfamiliar units, travelers navigating between countries that use different measurement systems, and anyone who needs a quick, reliable conversion without manual calculation.
India officially uses the metric system, but imperial measurements remain common in everyday life β height is frequently stated in feet and inches, screen sizes are in inches, and property dimensions sometimes use yards or square feet. This converter bridges that gap, handling 12 units from the microscopic (nanometers) to the astronomical (light years).
Sources & Methodology
All conversion factors in this tool are based on the International System of Units (SI) maintained by the Bureau International des Poids et Mesures (BIPM). The inch, foot, yard, and mile conversions follow the international yard and pound agreement of 1959, which defines the yard as exactly 0.9144 meters. The nautical mile is defined as exactly 1,852 meters by international convention. The light year uses the International Astronomical Union (IAU) definition based on the speed of light in vacuum.
Frequently Asked Questions
Yes, this length converter is 100% free to use with no hidden charges, no signup required, and no premium tiers. You can perform unlimited conversions without any restrictions.
Absolutely. All conversions happen directly in your browser using JavaScript. No data is sent to any server, no cookies are stored, and no personal information is collected. Your input values never leave your device.
This converter uses internationally standardized conversion factors defined by the International System of Units (SI). Results are accurate to at least 10 decimal places internally, with display rounded to 6 significant figures for readability.
The tool supports 12 units: millimeter, centimeter, meter, kilometer, inch, foot, yard, mile, nautical mile, micrometer, nanometer, and light year. This covers everyday measurements, scientific scales, and astronomical distances.
Yes, you can freely convert between metric units like meters, centimeters, and kilometers and imperial units like feet, inches, yards, and miles. The converter handles cross-system conversions seamlessly.
First convert your measurement entirely to inches (multiply feet by 12 and add remaining inches), then enter that total in the converter with Inch as the source unit and Centimeter as the target unit. For example, 5 feet 8 inches equals 68 inches, which converts to 172.72 cm.
Yes, the length converter is fully responsive and works on all devices including smartphones, tablets, and desktop computers. The interface adjusts automatically to your screen size for comfortable use.
A nautical mile equals 1,852 meters and is used in maritime and aviation navigation. A regular (statute) mile equals 1,609.344 meters. One nautical mile is approximately 1.151 regular miles. The nautical mile is based on one minute of latitude on Earth.