CalculateMeasure

Length Converter

Convert a length or distance between common metric, U.S. customary, imperial, and nautical units using verified conversion factors.

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Converted Length
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How the Conversion Works

Each value is converted to meters as a base unit and then from meters to the selected output unit. This avoids maintaining a separate formula for every unit pair.

Common Exact Conversions

  • 1 inch = 2.54 centimeters
  • 1 foot = 0.3048 meters
  • 1 yard = 0.9144 meters
  • 1 mile = 1.609344 kilometers
  • 1 nautical mile = 1,852 meters

Sources & Methodology

U.S. customary conversion factors follow the National Institute of Standards and Technology (NIST) Guide to the SI. The international yard is exactly 0.9144 meter and the international foot is exactly 0.3048 meter; the nautical mile is 1,852 meters.

Calculator guide

About the Length Converter

Length conversion expresses the same physical distance in a different unit using fixed conversion factors.

What to keep in mind

  • Identify the source and target units before converting.
  • Rounding can slightly change displayed values.
  • Keep extra precision during intermediate calculations when accuracy matters.

Formula & methodology

Convert between meters, feet, inches, centimeters, miles, kilometers, yards, and more.

Review standard: Level A · Standard formula. How calculator reviews work.

CalculateMeasure performs the arithmetic locally in your browser. The displayed result depends on the values and units you enter.

Authoritative reference

NIST publishes conversion factors between SI and commonly used non-SI units.

NIST Guide to the SI — Conversion Factors ↗

Source links support the formula or conversion methodology. CalculateMeasure remains responsible for its implementation and testing.

Frequently asked questions

What does this calculator calculate?

Length conversion expresses the same physical distance in a different unit using fixed conversion factors.

Can I use the result for an important decision?

Use the result as a calculation aid and verify the inputs, assumptions, and applicable professional or regulatory requirements before relying on it for an important decision.

Does CalculateMeasure store the values I enter?

This calculator performs its arithmetic in your browser. The calculator itself does not need to send your entered values to a server to produce the result.