Kilometer (km)
One thousand meters.
What is a kilometer?
- Symbol
- km
- Quantity
- Length
- Unit system
- SI
- Definition
- One thousand meters.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used for road distances, speed limits (km/h) and geography in most countries.
Kilometer in other length units
- 1 km = 1000000000000 nmNanometer
- 1 km = 1000000000 µmMicrometer
- 1 km = 1000000 mmMillimeter
- 1 km = 100000 cmCentimeter
- 1 km = 1000 mMeter
- 1 km = 10000000000000 ÅÅngström
- 1 km ≈ 39370078.74 milMil (thou)
- 1 km ≈ 39370.07874 inInch
- 1 km ≈ 3280.839895 ftFoot
- 1 km ≈ 1093.613298 ydYard
- 1 km ≈ 0.6213711922 miKilometer to Mile converter
- 1 km ≈ 0.5399568035 nmiKilometer to Nautical mile converter
Kilometer quick reference
| Kilometer | Mile | Nautical mile | Meter |
|---|---|---|---|
| 1 km | ≈ 0.6213711922 mi | ≈ 0.5399568035 nmi | = 1000 m |
| 10 km | ≈ 6.213711922 mi | ≈ 5.399568035 nmi | = 10000 m |
| 100 km | ≈ 62.13711922 mi | ≈ 53.99568035 nmi | = 100000 m |
| 1000 km | ≈ 621.3711922 mi | ≈ 539.9568035 nmi | = 1000000 m |
Where the kilometer fits
The next smaller length unit is the meter (m). 1 km = 1000 m, and 1 m = 0.001 km.
The next larger length unit is the mile (mi). 1 km ≈ 0.6213711922 mi, and 1 mi = 1.609344 km.
Frequently asked questions
- How many miles are in one kilometer?
- One kilometer ≈ 0.6213711922 mi (miles).
- How many nautical miles are in one kilometer?
- One kilometer ≈ 0.5399568035 nmi (nautical miles).
- How many meters are in one kilometer?
- One kilometer = 1000 m (meters).