Length Converter

Length Converter

Local Processing

Convert between metric and imperial length units including millimeter, centimeter, meter, kilometer, inch, foot, yard, and mile.

How It Works & Processing Standards

Convert between the units listed below using m as the base unit.

um1 um = 0.000001 m
mm1 mm = 0.001 m
cm1 cm = 0.01 m
km1 km = 1000 m
in1 in = 0.0254 m
ft1 ft = 0.3048 m
yd1 yd = 0.9144 m
mi1 mi = 1609.344 m
nmi1 nmi = 1852 m

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Converts metric (µm, mm, cm, m, km), imperial (in, ft, yd, mi) and nautical miles using exact international definitions such as 1 in = 2.54 cm.

How to Use Length Converter

  1. 1
    Enter a valueDecimals and negative numbers (for temperature, say) are accepted.
  2. 2
    Choose unitsPick the unit you have and the unit you want. The swap button reverses the direction.
  3. 3
    Read, copy or shareResults show up to six decimal places. Copy them or create a share link with the same value.

Examples

180 cm in feet
Input: 180 cm → ft
Result: 5.905512
A marathon in miles
Input: 42.195 km → mi
Result: 26.218757

Common Use Cases

  • Reading inch or foot sizes from overseas stores in cm
  • Comparing running or cycling distances in km and miles
  • Nautical or aviation distances in km

Frequently Asked Questions (FAQ)

Is 5.9 feet the same as 5 feet 9 inches?

No. 0.9 ft is about 10.8 in, so 5.9 ft is about 5 ft 11 in.

How long is a nautical mile?

Exactly 1.852 km.

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