Conversion Calculators
Length Converter
Convert length and distance between metric and imperial units: millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Quick guide
Enter a value and choose the units to convert from and to: millimeters, centimeters, meters, kilometers, inches, feet, yards, or miles. Conversions use exact international factors, with one inch defined as 25.4 mm.
Read the full explanationHow It Works
All length units convert through meters using exact international factors — one inch is defined as exactly 25.4 millimeters.
Formula Used
value × from-factor ÷ to-factor (base unit: meter).
Example Calculation
100 m = 328.084 ft; 5 mi = 8.047 km.
Practical Use Cases
- Convert heights and distances between systems.
- Work with maps, travel, and DIY measurements.
- Check track and field distances.