A hurricane report says 75 mph winds. How fast is that in knots?

75 mph = 65.2 knots. That's a strong storm. For reference, hurricane categories use 74+ mph (64+ knots) as Category 1 threshold.

How do I estimate mph to knots mentally?

Rough estimate: multiply by 0.87 (or divide by 1.15). Example: 30 mph ÷ 1.15 ≈ 26 knots. For precision, divide by 1.15078.

A fishing guide says the boat can do 35 mph max speed. What does that translate to in knots for planning a day trip?

35 mph = 30.4 knots. If you're heading 20 nautical miles out and 20 back, that's 40 nautical miles total; at 30 knots you'll spend just over an hour and a half on the water (not counting refueling or delays).

I'm reading weather data that says wind speeds of 60 mph in a tropical storm. What's that in knots?

60 mph = 52.1 knots. That's at the boundary between tropical storm (39-73 mph) and hurricane strength (74+ mph). In knots, that's 34-63 knots for tropical storms and 64+ for hurricanes. For the reverse conversion, see [knots to mph](/speed/knots-to-mph/).

Miles per Hour (mph) to Knots Converter

Enter a value to instantly convert between speed units.

From

Precision4 dp

1 Mile per Hour = 0.869 Knot

Key Formulas

Kilometer per Hour → Mile per Hour

mph = km/h × 0.621371

Mile per Hour → Kilometer per Hour

km/h = mph × 1.60934

Knot → Mile per Hour

mph = kn × 1.15078

Mile per Hour → Knot

kn = mph × 0.868976

Formula

knots = mph ÷ 1.15078

To convert miles per hour to knots, divide by 1.15078. This is useful when reading maritime or aviation specifications, weather reports (hurricane speeds), or nautical navigation instructions.

Source: NIST SP 811, Table B.8

Frequently Asked Questions

Real-World Examples

Slow motorboat or sailboat drift. Leisurely pace for small vessel movement.

10 mph = 8.69 kn

Average boat speed. Typical for fishing boats or recreational cruising.

20 mph = 17.38 kn

Fast boat or light aircraft. Above-average maritime speed; typical for fast ferries.

30 mph = 26.06 kn

High-speed aircraft or raceboat. Aircraft cruise at 300-500 mph; this is relative slow for air travel.

100 mph = 86.9 kn

kmh to mph mph to kmh knots to mph ms to kmh kmh to ms

Miles per Hour (mph) to Knots Converter

Key Formulas

Formula

Frequently Asked Questions

Real-World Examples

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