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 one km/h in a straight line for one hour moves one 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
