Mph to Knots Converter
Convert miles per hour to knots easily. Free mph to knots converter for ships and aircraft.
Formula
knots = mph x 0.868976
Common Conversions
How to Convert MPH to Knots
1 mph = 0.869 knots. Multiply mph by 0.869 (or divide by 1.151) to get knots. So 60 mph × 0.869 = 52.14 knots. The conversion comes up most often when interpreting marine forecasts (which use knots) for boat owners more familiar with mph.
Useful for boating, sailing, and aviation contexts where mph values need to be expressed in knots. A 25 mph wind = 21.7 knots = moderate breeze. 35 mph = 30.4 knots = near gale. 60 mph = 52 knots = strong gale to storm. Hurricane minimum (74 mph) = 64.3 knots.
Common MPH to Knots
| MPH | Knots |
|---|---|
| 10 mph | 8.69 kt |
| 20 mph | 17.38 kt |
| 25 mph | 21.72 kt |
| 35 mph | 30.41 kt |
| 50 mph | 43.45 kt |
| 74 mph (hurricane) | 64.30 kt |
| 100 mph | 86.90 kt |
| 157 mph (Cat 5) | 136.43 kt |
Frequently Asked Questions
How does the Beaufort scale relate to knots?
Beaufort 0 (calm): 0 knots. Beaufort 5 (fresh breeze): 17-21 knots. Beaufort 8 (gale): 34-40 knots. Beaufort 12 (hurricane): 64+ knots. The scale is the standard global wind classification.
What's typical aircraft speed in knots?
Commercial jets cruise at 450-490 knots true airspeed (about 520-565 mph). Private aircraft: 100-200 knots. Helicopter cruise: 100-150 knots. The 'V speeds' on aircraft instruments (rotation speed, takeoff safety) are always in knots.
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