Speed Converter

Convert between speed units

Amount

From

To

0.621371 mph

rate：1 km/h = 0.62137119 mph

Decimals 6 Thousands separator Scientific notation

Results in all units

1 km/h

Unit	Symbol	Value
Metric
Meters/second	m/s	0.277778
Kilometers/hour	km/h	1
Centimeters/second	cm/s	27.777778
Millimeters/second	mm/s	277.777778
Kilometers/second	km/s	0.000278
Meters/minute	m/min	16.666667
Imperial / Nautical
Miles/hour	mph	0.621371
Feet/second	ft/s	0.911344
Feet/minute	ft/min	54.680665
Inches/second	in/s	10.936133
Yards/second	yd/s	0.303781
Knots	kn	0.539957
Special
Mach (sea level)	Ma	0.000816
Speed of light	c	9.265669e-10

Popular Speed Conversions

Recent Conversions

Clear

No conversions yet. Your conversions will be recorded here (stored locally in your browser only).

Trending Conversions

Just Converted

78 Kilometers/second → 15,354,330.7087 Feet/minute 🚀 Speed 20 Inches/second → 50.8 Centimeters/second 🚀 Speed 30 Feet/second → 32.9184 Kilometers/hour 🚀 Speed 2 Kilometers/hour → 109.3613 Feet/minute 🚀 Speed 75 Millimeters/second → 14.7638 Feet/minute 🚀 Speed 97 Mach (sea level) → 1,980,487.8 Meters/minute 🚀 Speed 82 Millimeters/second → 2.7352e-10 Speed of light 🚀 Speed 69 Feet/second → 0.021 Kilometers/second 🚀 Speed 6 Yards/second → 5.4864 Meters/second 🚀 Speed 35 Kilometers/hour → 1,913.8233 Feet/minute 🚀 Speed

Common Scenarios

Speed conversion is closely linked to transportation, aviation, navigation, and sports. In China, speed limits use kilometers per hour (km/h), while in the US and UK, speedometers often use miles per hour (mph). In navigation and aviation, ships and aircraft use "knots."

History & Background

The elegant unit "knot" originated in the great age of sail. Sailors threw a wooden board tied to a rope with knots over the stern and counted the knots that slipped into the water over a set time to calculate speed.

Conversion Details

Speed conversion is based on meters per second (m/s).

Common conversions: 1 m/s = 3.6 km/h, 1 mph ≈ 1.609 km/h, 1 knot = 1.852 km/h.