Length Converter

Convert between metres, centimetres, millimetres, kilometres, inches, feet, yards, and miles. Uses standard definitions; results update as you type.

Result
3.2808399 ft

Informational only; verify critical results independently.

How to use

  1. Enter the length value in the first field. Use a decimal point or comma; both work.
  2. Choose the “from” unit (the unit of the value you entered): mm, cm, m, km, in, ft, yd, or mi.
  3. Choose the “to” unit (the unit you want the result in). It can be the same as “from” to verify.
  4. The result updates as you type. Large or small numbers are shown with appropriate precision.
  5. Metric units: mm (millimetre), cm (centimetre), m (metre), km (kilometre). Imperial/US: in (inch), ft (foot), yd (yard), mi (mile).
  6. Conversions use standard definitions: 1 in = 25.4 mm exactly; 1 ft = 0.3048 m; 1 yd = 0.9144 m; 1 mi = 1609.344 m.
  7. Use for DIY, travel, sports, or any length in daily or professional use. No data is sent to our servers.

Examples

  • 1 metre to feet
    Input: Value 1, From m, To ft
    Output: ≈ 3.28 ft
  • 5 miles to kilometres
    Input: Value 5, From mi, To km
    Output: ≈ 8.05 km
  • 100 cm to inches
    Input: Value 100, From cm, To in
    Output: ≈ 39.37 in
  • 6 feet to metres
    Input: Value 6, From ft, To m
    Output: ≈ 1.83 m
  • 1 yard to metres
    Input: Value 1, From yd, To m
    Output: ≈ 0.914 m
  • 10 mm to inches
    Input: Value 10, From mm, To in
    Output: ≈ 0.39 in
  • Marathon: 42.195 km to miles
    Input: Value 42.195, From km, To mi
    Output: ≈ 26.22 mi
  • 1000 m to km
    Input: Value 1000, From m, To km
    Output: 1 km

FAQ

Which units are supported?
Metric: millimetre (mm), centimetre (cm), metre (m), kilometre (km). Imperial/US: inch (in), foot (ft), yard (yd), mile (mi).
Are the conversions exact?
We use the standard, exact definitions (e.g. 1 in = 25.4 mm). Results are exact; display may round to a readable number of decimals.
US vs UK miles and yards?
We use the international definitions: 1 yd = 0.9144 m, 1 mi = 1609.344 m. US and UK statute miles are the same for length.
Can I convert area or volume?
No. This tool is length only. Converting area (e.g. square feet to square metres) requires a separate area converter because the conversion factor is squared.
Why does it show so many decimals?
Small units (e.g. mm to in) can produce long decimals. We show up to a sensible number of digits; you can round for practical use.
Is it suitable for surveying or construction?
It’s fine for everyday and many professional estimates. For legally or contractually critical values, confirm with authoritative sources or survey data.
What about nautical miles?
We don’t include nautical miles in this tool. 1 nautical mile = 1852 m; you can convert to metres first then to other units if needed.
Does it work offline?
Once the page is loaded, all conversion runs in your browser, so it works without a connection after that.

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