Length Converter
Convert between metric and imperial length units — meters, kilometers, centimeters, millimeters, inches, feet, yards, miles, and nautical miles.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
5 km = 5000 m
1 Kilometer = 1000 Meters
1 Meter = 0.001 Kilometers
5 km in every supported unit
What is a Length Converter?
A length converter translates a distance measured in one unit into its equivalent in another — for example, turning kilometers into miles, or inches into centimeters. Because the world uses two parallel systems (the metric system almost everywhere, and the imperial/US customary system in the United States, Liberia, and Myanmar), converting between them accurately requires precise multipliers rather than rough estimates.
Every unit below is defined relative to the meter, the SI base unit of length, so any conversion — metric to metric, imperial to imperial, or across systems — reduces to a single multiplication.
Conversion chart: Kilometer to Meters
Conversion table
| Kilometer (km) | Meter (m) |
|---|---|
| 0.01 km | 10 m |
| 0.1 km | 100 m |
| 1 km | 1000 m |
| 2 km | 2000 m |
| 3 km | 3000 m |
| 5 km | 5000 m |
| 10 km | 10000 m |
| 20 km | 20000 m |
| 50 km | 50000 m |
| 100 km | 100000 m |
| 1000 km | 1000000 m |
Supported Units
| Unit | Symbol | In Meters |
|---|---|---|
| Millimeter | mm | 0.001 m |
| Centimeter | cm | 0.01 m |
| Meter | m | 1 m |
| Kilometer | km | 1000 m |
| Inch | in | 0.0254 m |
| Foot | ft | 0.3048 m |
| Yard | yd | 0.9144 m |
| Mile | mi | 1609.344 m |
| Nautical Mile | nmi | 1852 m |
About These Parameters
- Value
- The number you want to convert, expressed in the "From" unit. Accepts decimals.
- From Unit
- The unit your input value is currently measured in.
- To Unit
- The unit you want the result converted into. Use the swap button to flip From and To instantly.
How Length Conversion Works
The Formula
Every unit here is defined by a fixed multiplier relative to the meter. To convert a value from one unit to another:
result = value × (factor of "From" unit ÷ factor of "To" unit)
For Kilometer → Meter: multiply by 1000. For example, 5 km × 1000 = 5000 m.
Metric vs. Imperial
The metric units on this page (millimeter through kilometer) all scale by powers of ten, so converting between them is just moving a decimal point. Imperial/US customary units (inch, foot, yard, mile) use irregular multiples — 12 inches to a foot, 3 feet to a yard, 1,760 yards to a mile — inherited from centuries of regional standards before the metric system existed.
Why Precision Matters
Length conversions look simple but small rounding errors compound over large distances or repeated calculations — this is why, for example, NASA's Mars Climate Orbiter was lost in 1999 after one team used metric units and another used imperial units without converting. Every multiplier used on this page is the exact, internationally defined conversion factor, not a rounded approximation.
Example
5 km equals 5000 m. For scale, that's about 2941.18× the height of an average adult (1.7 m, or 0.0017 km).
Frequently Asked Questions
Why does the US still use feet and miles?
The US never mandated metrication despite the Metric Conversion Act of 1975 declaring it the preferred system; adoption remained voluntary, so imperial units stayed dominant in everyday life, construction, and road signage, while science and medicine in the US use metric units almost exclusively.
What's the difference between a mile and a nautical mile?
A statute mile (1,609.344 m) is a land-distance unit; a nautical mile (1,852 m) is based on one minute of latitude and is used for sea and air navigation because it relates directly to a ship or aircraft's position on a chart.
How accurate are these conversions?
Every conversion factor used here is the exact, internationally standardized value (e.g. 1 inch = exactly 2.54 cm, fixed by international agreement in 1959) — results are limited only by floating-point display precision, not by rounded conversion constants.