Kilometres per hour
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Kilometres per hour is a unit of measurement, which measures speed or velocity. The unit symbol is km/h or km·h−1. By definition, an object travelling at a speed of 1 km/h in a straight line for 1 hour moves 1 kilometre. The unit is the most commonly used unit of speed worldwide, more common than the SI unit of speed, metres per second.
Conversions
- 3.6 km/h ≡ 1 m/s, the SI unit of speed, metre per second
- 1 km/h ≈ 0.277 78 m/s
- 1 km/h ≈ 0.621 37 mph ≈ 0.911 34 feet per second
- 1 knot ≡ 1.852 km/h (exactly)
- 1 mile = 1.609344 km (~1.61 km)
- n km/h ≈ (1.61 * n) mph (where n is a quantity of speed in km/h)
- 1 mph = ~1.6 km/h
Kilometres Per Hour Media
Speed limit sign in the Republic of Ireland, using "km/h."
Speed limit units on traffic signs around the world:* Kilometres per hour (km/h)* Miles per hour (mph)* Both* none known
100 km/h sign following the most common implementation of the Vienna Convention style (Hungary)
Swedish 30 km/h speed limit – the yellow background provides a contrast in case snow covers the background against which one perceives the road sign.
Since the text "km/h" on this Irish speed limit sign is a symbol, not an abbreviation, it represents both "kilometres per hour" (English) and "ciliméadar san uair" (Irish)
60 km/h speed limit in Arabic numerals (below) and Arabic script (above) (UAE)
Waterways speed limit of 9 km/h (Finland)
50 km/h sign in Mexico
