Length

Metric and imperial length units.

Unit converter

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Common references

1 mm = 0.1 cm
1 cm = 0.01 m
1 m = 0.001 km
1 in ≈ 2.54 cm
1 ft = 12 in
1 yd = 3 ft
1 mi ≈ 1.609 km

About the Length converter

Length is a common conversion in daily work and study. This converter supports 8 units, including Millimeter (mm), Centimeter (cm), Meter (m), Kilometer (km), Inch (in), Foot (ft). Pick the from/to units, enter a value, and get the result instantly.

Conversions follow standard factors and display up to 12 decimal places. The common reference table below lists the most-used baseline values for quick comparison.

Which unit system do these conversions follow?

Everyday conversions for length, mass and related quantities follow the International System of Units (SI), maintained through the General Conference on Weights and Measures. NIST publishes an English reference. Celsius and Fahrenheit also differ by an offset, not only by a scale factor.

“The International System of Units (SI), commonly known as the metric system, is the international standard for measurement.”

Frequently Asked Questions

Is this converter free?

Yes, it is completely free. The site shares a daily quota of 20 conversions across all tools.

Which Length units are supported?

It supports 8 units, including Millimeter (mm), Centimeter (cm), Meter (m), Kilometer (km), Inch (in), Foot (ft). Any pair can be selected in the from/to dropdowns.

How accurate are the results?

Results use standard conversion factors and display up to 12 decimal places, enough for almost all use cases.