KM to Meters Converter
Convert kilometers to meters — a thousand to the kilometer. Results update as you type; exact factors shown.
One kilometer is 1,000 meters — see the exact factor, not a rounded rule of thumb.
How the km to meters converter works
Every length is converted through the meter, the SI base unit of length. The inch has been defined as exactly 25.4 mm since the 1959 international yard and pound agreement, so a foot is exactly 0.3048 m, a yard 0.9144 m and a statute mile 1,609.344 m. The nautical mile is 1,852 m by international definition.
The US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common length conversions
| From | To | Units |
|---|---|---|
| 0.1 km | 100 m | kilometers to meters |
| 0.5 km | 500 m | kilometers to meters |
| 1 km | 1,000 m | kilometer to meters |
| 1.6 km | 1,600 m | kilometers to meters |
| 2 km | 2,000 m | kilometers to meters |
| 5 km | 5,000 m | kilometers to meters |
| 10 km | 10,000 m | kilometers to meters |
| 21.1 km | 21,100 m | kilometers to meters |
| 42.2 km | 42,200 m | kilometers to meters |
| 50 km | 50,000 m | kilometers to meters |
| 100 km | 100,000 m | kilometers to meters |
| 1,000 km | 1,000,000 m | kilometers to meters |
Units in this converter and their exact factors
| Unit | Symbol | One unit in meters |
|---|---|---|
| millimeter | mm | 0.001 meter |
| centimeter | cm | 0.01 meter |
| meter | m | 1 meter |
| kilometer | km | 1,000 meter |
| inch | in | 0.0254 meter |
| foot | ft | 0.3048 meter |
| yard | yd | 0.9144 meter |
| mile | mi | 1,609.344 meter |
| nautical mile | nmi | 1,852 meter |
FAQFrequently asked questions about length conversion
How many meters in a kilometer?
Exactly a thousand.
How far is a 5K in meters?
5,000 m.
How long is a marathon?
42,195 meters.
How do I convert quickly?
Move the decimal point three places right.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.