Kilometer per Hour (km/h)
Kilometres per hour is the road speed unit in Canada, Australia, India, Europe and most of the world. Highway limits are typically 100–130 km/h.
Symbol: km/h
Quantity: speed (distance per time)
SI relation: 1 km/h = 0.2777777777778 m/s (exact)
Derivation: 1 km/h = 1000 m ÷ 3600 s = 1/3.6 m/s exactly.
Exact: yes, by definition
Typical uses
- Road speed limits and car speedometers
- Weather (wind speed in many countries)
- Cycling and running pace
Convert kilometers per hour to other units
| Conversion | 1 km/h equals | Reverse |
|---|---|---|
| kilometer per hour to meter per second | 0.2777777778 m/s | meter per second to kilometer per hour |
| kilometer per hour to mile per hour | 0.6213711922 mph | mile per hour to kilometer per hour |
| kilometer per hour to foot per second | 0.9113444153 ft/s | foot per second to kilometer per hour |
| kilometer per hour to knot | 0.5399568035 kn | knot to kilometer per hour |
Open the Speed Converter to convert any value between all units.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (radian) and Table 8 (non-SI units accepted for use with the SI).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Kilometer per Hour (km/h). Retrieved October 25, 2026, from https://scientificconverters.com/units/kilometer-per-hour/
IEEE
Scientific Converters, "Kilometer per Hour (km/h)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/kilometer-per-hour/