Speed Converter

Convert between km/h, mph, m/s, knots, ft/s, and Mach — all results shown simultaneously.

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Formula: BIPM / NISTLast verified July 2026

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Referencia rápida — conversiones de Kilometres/hour

km/h	m/s	mph	kn	ft/s
1	0.27777778	0.62137119	0.53995727	0.91134442
5	1.388889	3.106856	2.699786	4.556722
10	2.777778	6.213712	5.399573	9.113444
25	6.944444	15.53428	13.498932	22.78361
50	13.888889	31.06856	26.997863	45.567221
100	27.777778	62.137119	53.995727	91.134442

Ejemplos prácticos

Speed limit: 100 km/h in mph

The most common highway speed limit in Europe is 100 km/h = 62.14 mph. The UK limit is 70 mph = 112.65 km/h. UAE highways are typically 120 km/h = 74.56 mph.

Aircraft cruising speed in Mach

A commercial airliner cruises at around 900 km/h = 250 m/s = 559 mph ≈ Mach 0.85. Mach 1 (the speed of sound at sea level) = 340.29 m/s = 1,225 km/h = 761 mph.

Usain Bolt's top speed

During the 2009 World Championships 100m final, Bolt reached a peak speed of 44.72 km/h = 27.79 mph = 12.42 m/s. That is approximately 0.037 Mach at sea level.

Preguntas frecuentes

lectura de 4 min

How many mph in 100 km/h?▾

62.1371 mph. A useful approximation is to multiply km/h by 0.621 for mph. Conversely, to go from mph to km/h, multiply by 1.609.

What is a knot?▾

A knot is one nautical mile per hour = 1.852 km/h = 1.151 mph. It is used in aviation and maritime contexts because one nautical mile corresponds to one arc-minute of latitude, making navigation calculations simpler on charts.

What is Mach 1?▾

Mach 1 is the speed of sound in dry air at sea level at 20°C — approximately 340.29 m/s = 1,225 km/h = 761 mph. The exact value depends on temperature and altitude; at 30,000 ft (cold, thin air) it is lower — around 295 m/s.

What is the fastest speed ever recorded for a human-made object?▾

The Parker Solar Probe reached approximately 692,000 km/h (430,000 mph) in its close approach to the Sun — around Mach 635. The fastest crewed aircraft was the SR-71 Blackbird at Mach 3.3 = 3,540 km/h = 2,200 mph.

How do I convert km/h to m/s?▾

Divide by 3.6. So 90 km/h ÷ 3.6 = 25 m/s. To go the other way, multiply m/s × 3.6 to get km/h. This works because 1 km = 1,000 m and 1 hour = 3,600 s: km/h × (1000/3600) = m/s.

What speed does UAE law set for highways?▾

UAE federal law sets most urban speed limits at 60–80 km/h and highway limits at 100–120 km/h. Salik-equipped roads may allow up to 120 km/h; specific routes like Sheikh Zayed Road allow 100 km/h in urban sections. Always check posted limits as radars enforce strict tolerances.

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