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Length Converter

Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, nautical miles, and light years instantly. Type a value in any unit to see all conversions at once.

Enter a value above to see all unit conversions.

Common Length Conversions

1 inch = 2.54 cm
1 foot = 30.48 cm
1 yard = 0.9144 m
1 mile = 1.609 km
1 km = 0.621 miles
1 nautical mile = 1.852 km
1 meter = 3.281 feet
1 cm = 0.394 inches

How to Use the Length Converter

  1. 1
    Enter a Value
    Type any length value into the input field. You can enter decimals or very large numbers.
  2. 2
    Select Your Unit
    Choose the unit you are converting from using the dropdown — metric or imperial.
  3. 3
    See All Conversions
    All 10 units update instantly. The selected unit card is highlighted for easy reference.
  4. 4
    Change Units Freely
    Switch to any other unit at any time — the input value is always re-converted from the selected base unit.

Frequently Asked Questions

There are exactly 2.54 centimeters in one inch. This is a defined conversion — 1 inch = 2.54 cm exactly. So to convert inches to cm, multiply by 2.54. To convert cm to inches, divide by 2.54.

One mile equals exactly 1.609344 kilometers. To convert miles to km, multiply by 1.609344. To convert km to miles, multiply by 0.621371. For example, 100 km = 62.1 miles, and 60 mph = 96.6 km/h.

One meter equals approximately 3.28084 feet. Conversely, one foot equals exactly 0.3048 meters. So a 6-foot person is about 1.83 meters tall, and a 100-meter sprint is about 328 feet.

A nautical mile is a unit of length used in navigation and aviation, equal to exactly 1,852 meters (or about 1.151 statute miles). It is based on the circumference of the Earth — one nautical mile equals one minute of arc of latitude.

One light year is approximately 9.461 × 10¹² kilometers (about 9.46 trillion km). It is the distance light travels in one year at a speed of 299,792 km/s. The nearest star to our solar system, Proxima Centauri, is about 4.24 light years away.

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