Kilometers to Meters Converter
Convert kilometers to meters — multiply by a thousand. 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 kilometers 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 |
| 0.4 km | 400 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 |
| 21.0975 km | 21,097.5 m | kilometers to meters |
| 42.195 km | 42,195 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 1,000.
What is a marathon in meters?
42,195 m — the distance is defined exactly.
What is 400 m?
0.4 km — one lap of a standard athletics track.
What is 1 km in miles?
0.621 miles.
What is a myriameter?
An obsolete unit of 10 km. It appears in old French and German texts.
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.