mph to Knots Converter

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Convert miles per hour to knots at the rate 1 mph ≈ 0.8690 knot. Useful when a US-style mph wind reading or sport-yacht speed needs to be translated into the maritime/aviation knot convention. Anchors: 60 mph ≈ 52.14 kn, 100 mph ≈ 86.90 kn, 200 mph ≈ 173.80 kn. Browser-local conversion.

Mile per hour (mph)
Knot (kn)

Mile per hour (mph) → Knot (kn)

Quick reference table

Mile per hour (mph)Knot (kn)
10 mph8.6898 kn
25 mph21.7244 kn
50 mph43.4488 kn
60 mph52.1386 kn
80 mph69.5181 kn
100 mph86.8976 kn
120 mph104.2771 kn
150 mph130.3464 kn
200 mph173.7952 kn

Glossary

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.

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.

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

Knots to mph
Convert knots to mph — 1 knot ≈ 1.1508 mph
mph to km/h
Convert mph to km/h — 1 mph = 1.6093 km/h
km/h to Knots
Convert km/h to knots — 1 km/h ≈ 0.5400 knot
Speed Converter
Convert speed — m/s, km/h, mph, knots, ft/s, mach