Updated 2026-07-31
Knots to km/h Conversion Chart
Knots are common in marine speed, wind reports, sailing, boating, and aviation. The conversion is simple: 1 knot equals 1.852 km/h.
Quick chart
1 knot is 1.852 km/h, 10 knots is 18.52 km/h, 20 knots is 37.04 km/h, 30 knots is 55.56 km/h, 50 knots is 92.6 km/h, and 100 knots is 185.2 km/h.
Formula
Use km/h = knots × 1.852. For reverse conversion, use knots = km/h × 0.539957.
When to use it
Use this chart when reading boat speed, wind speed, marine weather, ferry details, or trip summaries that use knots instead of kilometers per hour.
Common knot conversions
For quick checks, remember that 5 knots is 9.26 km/h, 15 knots is 27.78 km/h, 25 knots is 46.3 km/h, and 40 knots is 74.08 km/h.
Knots, boats, and GPS speed
A boat GPS speedometer usually reports speed over the ground. Water current, wind, and route direction can make that different from speed through the water.
Related calculator
If you already know the speed in knots, use the knots to km/h converter for an exact value and quick comparison with road speed units.
FAQ
Convert knots to km/h with a clear chart for 1, 5, 10, 20, 30, 50 and 100 knots, plus the exact formula for boat speed.
How many km/h is 20 knots?
20 knots equals 37.04 km/h.
How many km/h is 30 knots?
30 knots equals 55.56 km/h.
Is one knot the same as one km/h?
No. One knot is 1.852 km/h.
What is 50 knots in km/h?
50 knots equals 92.6 km/h.
Why do boats use knots?
Knots are based on nautical miles, which are standard in marine navigation.
Can I convert km/h back to knots?
Yes. Multiply km/h by 0.539957 to get knots.