Knots to Kph Converter
Convert knots to kilometres per hour instantly. Free knots to kph converter for maritime and aviation.
Formula
km/h = knots x 1.852
Common Conversions
How to Convert Knots to KPH
1 knot = 1.852 km/h. Multiply knots by 1.852 to get km/h. So 30 knots × 1.852 = 55.56 km/h. The knot equals exactly 1 nautical mile per hour, where 1 nautical mile = 1,852 metres (1 minute of latitude at the equator). The 1.852 conversion is exact, not approximate.
Used in maritime weather reports and aviation. A 50-knot wind = 92.6 km/h (severe gale). 100 knots = 185 km/h (most aircraft cruise speed). Hurricane minimum wind speed (74 mph = 64 knots) = 119 km/h. Beaufort scale Force 8 (gale): 34-40 knots = 63-74 km/h.
Common Knots to KPH
| Knots | KPH |
|---|---|
| 1 knot | 1.85 km/h |
| 10 knots | 18.52 km/h |
| 20 knots | 37.04 km/h |
| 30 knots | 55.56 km/h |
| 50 knots | 92.60 km/h |
| 75 knots | 138.90 km/h |
| 100 knots | 185.20 km/h |
| 200 knots | 370.40 km/h |
Frequently Asked Questions
Why is the conversion exactly 1.852?
The nautical mile was internationally standardised at 1,852 metres in 1929. So 1 nautical mile per hour = 1.852 km/h exactly. The number isn't arbitrary - it derives from the meridian length of Earth divided by 21,600 (60 minutes × 360 degrees).
Quick mental conversion?
Knots × 2 ≈ km/h (8% over). Knots × 1.85 = closer. Most marine sailors learn the rough '×2' shortcut. Aviation precision: use exact 1.852.
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