Wind Speed mph ↔ Knots

1 knot = 1.15078 mph = 1.852 km/h. Bidirectional, also m/s.

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How to use this calculator

  • Pick direction.
  • Enter value.
  • Read all units.

About this calculator

A knot is one nautical mile per hour (1.15078 mph). Used in marine + aviation. Useful conversions: 10 kn = 11.5 mph = 18.5 km/h. Hurricane wind starts at 64 kn (74 mph). Light breeze (Beaufort 2) is ~6 kn.

Frequently asked

Why "knot"?+
Sailors measured speed by tossing a knotted rope over the stern; counted knots passing in a fixed time.
Nautical mile?+
1 nautical mile = 1 minute of latitude = 1.852 km. Designed for navigation.
Hurricane threshold?+
74 mph = 64 kn = Category 1 hurricane. Tropical storm: 39+ mph (34+ kn).
Pilot vs. mariner units?+
Both use knots and feet. Aviation: altitude in feet; speed in knots. Same units in both fields.
When to use mph?+
Casual / land-based contexts (highway, weather report in US). Pros use knots.

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