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Speed converter

Pick any two speed units. Every factor is exact, from 1 mph = 1.609344 km/h to 1 knot = 1.852 km/h.

1.60934

1 mph = 1.60934 km/hkm/h = mph × 1.609344 · shown to 6 significant figures

Precision

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Popular conversions

Knots to miles per hourTier 01 knot = 1.150779448 miles per hour. Type in either box; the other updates as you go.Kilometers per hour to miles per hourTier 01 kilometer per hour = 0.6213711922 miles per hour. Type in either box; the other updates as you go.Meters per second to miles per hourTier 01 meter per second = 2.236936292 miles per hour. Type in either box; the other updates as you go.Miles per hour to meters per secondTier 01 mile per hour = 0.44704 meters per second exactly. Type in either box; the other updates as you go.Miles per hour to kilometers per hourTier 01 mile per hour = 1.609344 kilometers per hour exactly. Type in either box; the other updates as you go.Miles per hour to knotsTier 01 mile per hour = 0.8689762419 knots. Type in either box; the other updates as you go.Miles per hour to feet per secondTier 01 mile per hour = 1.466666667 feet per second. Type in either box; the other updates as you go.Knots to kilometers per hourTier 01 knot = 1.852 kilometers per hour exactly. Type in either box; the other updates as you go.Feet per second to miles per hourTier 01 foot per second = 0.6818181818 miles per hour. Type in either box; the other updates as you go.Kilometers per hour to meters per secondTier 01 kilometer per hour = 0.2777777778 meters per second. Type in either box; the other updates as you go.Meters per second to kilometers per hourTier 01 meter per second = 3.6 kilometers per hour exactly. Type in either box; the other updates as you go.

Speed is distance divided by time, so a speed factor is just a length factor divided by a time factor. Road speeds use km/h or mph, physics and wind speeds in weather models use meters per second, ships and aircraft use knots, and ballistics and engineering in the US often use feet per second.

Use the converter above for any pair. The most searched pairs have their own pages with worked examples, reference tables of common speeds and mental-math shortcuts, listed above.