Knots to mph Converter

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Convert knots (nautical miles per hour) to miles per hour at the rate 1 knot ≈ 1.1508 mph. Useful for translating marine and aviation speed reports — wind speed at sea, ship speed-over-ground, aircraft cruise speed — into US-style mph. Anchors: 10 kn ≈ 11.51 mph, 30 kn ≈ 34.52 mph (gale), 70 kn ≈ 80.55 mph (hurricane), 480 kn ≈ 552 mph (airliner cruise). Browser-local.

Knot (kn)
Mile per hour (mph)

Knot (kn) → Mile per hour (mph)

Quick reference table

Knot (kn)Mile per hour (mph)
10 kn11.5078 mph
25 kn28.7695 mph
50 kn57.539 mph
60 kn69.0468 mph
80 kn92.0624 mph
100 kn115.0779 mph
120 kn138.0935 mph
150 kn172.6169 mph
200 kn230.1559 mph

Glossary

Knot (kn)

A knot is one nautical mile per hour, used in maritime navigation, aviation and meteorology. 1 knot = 1.852 km/h = 1.1508 mph = 0.5144 m/s. The unit comes from the practice of measuring ship speed by counting knots on a rope let out behind the vessel. Modern airliners cruise at about 470–510 knots; ocean currents at 1–4 knots.

Mile per hour (mph)

A mile per hour is the customary speed unit used in the United States, the United Kingdom and a few other countries for road traffic, athletic events and weather reports. 1 mph = 1.6093 km/h = 0.4470 m/s. Typical US highway limits are 55–75 mph; a 100 m sprinter peaks at about 27 mph; a hurricane is sustained winds above 74 mph.

Metric / SI speed

In the metric system, speed is reported in meters per second (scientific) or kilometers per hour (everyday). The relation is exact: 1 m/s = 3.6 km/h. Most countries use km/h on road signs and speedometers; m/s appears in physics, engineering, weather data and athletics where fine-resolution timing matters.

Imperial / US Customary speed

In the United States, the United Kingdom and a few other countries, road speeds are reported in miles per hour (mph). US engineering also uses feet per second (ft/s). 1 mph = 1.6093 km/h = 0.4470 m/s. Maritime and aviation worldwide use knots (1 knot = 1.852 km/h), independent of the metric/imperial divide.

Related tools

mph to Knots
Convert mph to knots — 1 mph ≈ 0.8690 kn
Knots to km/h
Convert knots to km/h — 1 knot = 1.852 km/h exactly
Knots to m/s
Convert knots to m/s — 1 knot ≈ 0.5144 m/s
Speed Converter
Convert speed — m/s, km/h, mph, knots, ft/s, mach