Authoritative definitions of the International System of Units and SI prefixes.
Unit converters
Length & distance
Enter your values below for a clear, instant result.
Length & distanceInstant result
Decimals
Formula result = input × 1 ÷ 1000. 1 m = 0.001 km
Common examples
One value, several units
Kilometres0.001 km
Centimetres100 cm
Millimetres1,000 mm
Miles0.0006 mi
Yards1.0936 yd
Feet3.2808 ft
Inches39.3701 in
Nautical miles0.0005 nmi
Conversion table
| m | km |
|---|---|
| 1 m | 0.001 km |
| 2 m | 0.002 km |
| 5 m | 0.005 km |
| 10 m | 0.01 km |
| 25 m | 0.025 km |
| 50 m | 0.05 km |
| 100 m | 0.1 km |
Conversion chart
1 m0.001 km
5 m0.005 km
10 m0.01 km
25 m0.025 km
50 m0.05 km
Worked example
1 metre equals 3.28084 feet.
Unit definition
Metres (m) SI base unit of length.
Unit history
The metre originated in the French metric system in the 1790s. Since 1983 it has been defined through the fixed speed of light.
Step by step
1. Parse the value, including fractions.
2. Convert m to metre.
3. Convert the base value to km and apply your display precision.
Understand the result before using it
Length & distance changes a one-dimensional distance from one unit to another without changing the physical length. The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 1 ÷ 1000
Assumptions
- The source and target selections represent the same physical quantity or supported notation.
- The entered value is valid for the selected relationship and uses the source unit shown.
- Published unit definitions and conventional conversion factors apply under their stated conditions.
Worked example
1 metre equals 3.28084 feet.
When to use it
Good uses
- Translate a length & distance value found in a document, specification, recipe, or measurement.
- Compare values reported in different unit systems.
- Check a manual conversion and control the displayed precision.
Limitations
Common mistakes to avoid
- Unit conversion does not account for measurement uncertainty, instrument calibration, or context outside the unit definition.
- Do not add meaningful digits beyond the precision of the original measurement.
- Confirm regulated, safety-critical, laboratory, and contractual values against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
What does the Length & distance converter do?
Length & distance changes a one-dimensional distance from one unit to another without changing the physical length. It does not change the physical quantity represented by the input.
What formula does the Length & distance converter use?
result = input × 1 ÷ 1000
Why can a Length & distance converter result be rounded?
UnitMora calculates with JavaScript double-precision numbers, then formats the result using your selected decimal or significant-figure setting. The unrounded value may contain more digits than are displayed.
What is the most common length & distance conversion mistake?
The most common mistake is selecting a similarly named but different unit or treating a rounded measurement as exact.
Clear answers, without the guesswork
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2Review the calculation
The formula and context explain how the result was reached.
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