mph to knots

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).

A knot is one nautical mile per hour, where a nautical mile equals exactly 1,852 meters. It's the standard speed unit in maritime and aviation contexts.

1 knot = 1 nautical mile/hour = 1,852 m/h = 1.852 km/h = 0.514 m/s. One nautical mile = 1,852 meters exactly.

To km/h: × 1.852. To mph: × 1.151. To m/s: × 0.514. To ft/s: × 1.688.

Ship cruising speeds (cruise ships: 20–25 knots), aircraft speeds (Boeing 747: 490 knots cruise), wind speed in aviation weather reports (METAR), and sailing.

Fastest ship: 60+ knots (naval vessels). Blue whale swim: 5–20 knots. Jet stream winds: 80–140 knots. Hurricane-force winds: 64+ knots.

Saying 'knots per hour' — incorrect! A knot already includes 'per hour.' Just say 'knots.' Also, confusing nautical and statute miles.

1 knot ≈ 1.85 km/h. Roughly: 10 knots ≈ 20 km/h. Remember: knots are for sea and sky, km/h and mph are for land.