How to convert knots to kilometres per hour
One knot equals 1.852 kilometres per hour, so multiply the number of knots by 1.852:
km/h = kn × 1.852
kn = km/h ÷ 1.852 (1 km/h = 0.539957 kn)
Example: 10 kn → 10 × 1.852 = 18.52 km/h.
Going the other way, divide by 1.852, or multiply by 0.539957.
Everyday values
| Knots | Kilometres per hour | For example |
|---|---|---|
| 1 kn | 1.852 km/h | one knot |
| 10 kn | 18.52 km/h | a sailing yacht |
| 20 kn | 37.04 km/h | a fast ferry |
| 30 kn | 55.56 km/h | a high-speed ferry |
| 150 kn | 277.8 km/h | a small aircraft |
| 490 kn | 907.48 km/h | an airliner at cruise (ground speed varies) |
When you need this conversion
Knots are nautical miles per hour, used for ships, aircraft and wind speed in marine and aviation weather. One knot is 1.852 km/h or 1.151 mph.
Knot to kilometre per hour conversion table
| kn | km/h | kn | km/h |
|---|---|---|---|
| 5 kn | 9.26 km/h | 55 kn | 101.86 km/h |
| 10 kn | 18.52 km/h | 60 kn | 111.12 km/h |
| 15 kn | 27.78 km/h | 65 kn | 120.38 km/h |
| 20 kn | 37.04 km/h | 70 kn | 129.64 km/h |
| 25 kn | 46.3 km/h | 75 kn | 138.9 km/h |
| 30 kn | 55.56 km/h | 80 kn | 148.16 km/h |
| 35 kn | 64.82 km/h | 85 kn | 157.42 km/h |
| 40 kn | 74.08 km/h | 90 kn | 166.68 km/h |
| 45 kn | 83.34 km/h | 95 kn | 175.94 km/h |
| 50 kn | 92.6 km/h | 100 kn | 185.2 km/h |
About the units
- Knot (kn): 1 nautical mile per hour, exactly 1.852 km/h.
- Kilometre per hour (km/h): 1,000 metres per 3,600 seconds.
Both are units of speed. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many kilometres per hour are in one knot?
One knot is 1.852 kilometres per hour. One kilometre per hour is 0.539957 knots.
How do I convert knots to kilometres per hour?
Multiply the value in knots by 1.852. To go back, divide by 1.852.
What is 10 kn in kilometres per hour?
10 kn = 18.52 km/h.
What is 20 kn in kilometres per hour?
20 kn = 37.04 km/h.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.