Length Converter
Convert between metric and imperial length units instantly. Supports millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles.
Enter a value, select your units, and get an instant conversion with a full reference table.
Result
Quick Reference: 1 m in All Units
How to Use This Tool
- Enter the length value you want to convert.
- Select the unit you are converting from in the "From" dropdown.
- Select the unit you want to convert to in the "To" dropdown.
- Read the converted result and comparison instantly.
- Use "Swap Units" to quickly reverse the From and To units.
- Check the Quick Reference table to see your value converted into every supported unit at once.
Formula & How It Works
Length Conversion Formula
result = value × (fromFactor ÷ toFactor)Every unit has a conversion factor expressed in meters. The value is normalized to meters (value × fromFactor), then divided by the target unit's factor to get the final result.
Miles to Kilometers
km = miles × (1609.344 ÷ 1000)1 mile is defined as exactly 1609.344 meters, so converting to kilometers means multiplying by the mile factor and dividing by 1000 (meters per kilometer).
Nautical Miles
1 nautical mile = 1852 metersA nautical mile is based on one minute of arc of latitude and is used in aviation and maritime navigation.
Practical Examples & Common Use Cases
Converting miles to kilometers for a road trip
5 miles × (1609.344 ÷ 1000) = 5 × 1.609344 = 8.04672 km.
Converting a height in centimeters to feet
180 cm × (0.01 ÷ 0.3048) = 180 × 0.032808 ≈ 5.906 ft (about 5 ft 11 in).
Converting nautical miles to statute miles for flight planning
100 nautical miles × (1852 ÷ 1609.344) ≈ 115.08 miles.
Frequently Asked Questions
There are approximately 3.28084 feet in one meter. Conversely, one foot equals exactly 0.3048 meters. This relationship was internationally agreed upon in 1959.
Multiply the number of kilometers by 0.621371 to get miles. For a quick estimate, you can multiply by 0.6. For example, 10 km is approximately 6.21 miles.
A nautical mile equals 1,852 meters (approximately 1.151 regular miles). It is based on one minute of arc of latitude along any meridian and is used in air and sea navigation.
The metric system was developed in France during the 1790s for scientific consistency. Imperial units evolved from older English measurement traditions. Most countries now use metric, but the US, Liberia, and Myanmar still primarily use imperial units.
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