Mile per Hour to Knot (UK)

Mile per hour measures how many statute miles are traveled in one hour. It's the primary speed unit in the United States and some other countries using imperial measurements.

1 mph = 0.44704 m/s = 1.609 km/h. The conversion factor comes from the statute mile definition.

To km/h: × 1.609. To m/s: × 0.447. To ft/s: × 1.467. To knots: × 0.869.

US speed limits (25 mph residential, 65–75 mph interstate), vehicle speeds in US/UK, hurricane wind speeds (74+ mph), and baseball pitch speeds.

Sound barrier: 767 mph at sea level. Fastest car: 282.9 mph (Koenigsegg). Commercial jet: 550–580 mph cruise. Cheetah: 70 mph sprint.

Assuming 1 mph ≈ 1 km/h — actually 1 mph ≈ 1.6 km/h. Also, confusing statute miles with nautical miles.

Quick conversion: multiply mph by 1.6 for approximate km/h. Remember: 60 mph ≈ 100 km/h (slightly off but close).

The UK knot is a historical variation of the knot based on the British nautical mile (6,080 feet) rather than the international nautical mile (6,076.12 feet).

1 UK knot ≈ 1.853184 km/h = 0.5148 m/s. Slightly faster than the international knot (1.852 km/h).

To international knots: × 1.00064. To km/h: × 1.853. To m/s: × 0.5148.

None in modern use. Only relevant for interpreting historical British naval records.

The difference between UK and international knots is only 0.064% — barely noticeable but important for precise navigation.

Assuming all old British ship logs use the same knot as today — they don't, but the difference is tiny.

Historical only. Effectively identical to modern knot. Only matters for historical maritime research.