Kilometer per hour (km/h)
Exactly 1000 meters per 3600 seconds.
What is a kilometer per hour?
- Symbol
- km/h
- Quantity
- Speed
- Unit system
- metric
- Definition
- Exactly 1000 meters per 3600 seconds.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used for road speed limits and vehicle speeds in most countries.
Kilometer per hour in other speed units
- 1 km/h ≈ 27.77777778 cm/sCentimeter per second
- 1 km/h ≈ 0.2777777778 m/sKilometer per hour to Meter per second converter
- 1 km/h ≈ 0.0002777777778 km/sKilometer per second
- 1 km/h ≈ 0.6213711922 mphKilometer per hour to Mile per hour converter
- 1 km/h ≈ 0.9113444153 ft/sFoot per second
- 1 km/h ≈ 0.5399568035 knKilometer per hour to Knot converter
- 1 km/h ≈ 9.265669311e-10 cSpeed of light in vacuum
Kilometer per hour quick reference
| Kilometer per hour | Meter per second | Mile per hour | Knot |
|---|---|---|---|
| 1 km/h | ≈ 0.2777777778 m/s | ≈ 0.6213711922 mph | ≈ 0.5399568035 kn |
| 10 km/h | ≈ 2.777777778 m/s | ≈ 6.213711922 mph | ≈ 5.399568035 kn |
| 100 km/h | ≈ 27.77777778 m/s | ≈ 62.13711922 mph | ≈ 53.99568035 kn |
| 1000 km/h | ≈ 277.7777778 m/s | ≈ 621.3711922 mph | ≈ 539.9568035 kn |
Where the kilometer per hour fits
The next smaller speed unit is the centimeter per second (cm/s). 1 km/h ≈ 27.77777778 cm/s, and 1 cm/s = 0.036 km/h.
The next larger speed unit is the foot per second (ft/s). 1 km/h ≈ 0.9113444153 ft/s, and 1 ft/s = 1.09728 km/h.
Frequently asked questions
- How many meters per second are in one kilometer per hour?
- One kilometer per hour ≈ 0.2777777778 m/s (meters per second).
- How many miles per hour are in one kilometer per hour?
- One kilometer per hour ≈ 0.6213711922 mph (miles per hour).
- How many knots are in one kilometer per hour?
- One kilometer per hour ≈ 0.5399568035 kn (knots).