Knots to Kilometres per hour Converter (kn to km/h)
Convert knots to kilometres per hour instantly. 1 kn = 1.852 km/h. Includes the formula, a full conversion table and a calculator that works offline.
The formula
To convert knots to kilometres per hour, multiply by 1.852:
km/h = kn × 1.852Going the other way, divide instead — or multiply by 0.54, which is the same thing:
kn = km/h × 0.54Knots to Kilometres per hour conversion table
| Knots | Kilometres per hour |
|---|---|
| 1 kn | 1.852 km/h |
| 2 kn | 3.704 km/h |
| 3 kn | 5.556 km/h |
| 4 kn | 7.408 km/h |
| 5 kn | 9.26 km/h |
| 6 kn | 11.112 km/h |
| 7 kn | 12.964 km/h |
| 8 kn | 14.816 km/h |
| 9 kn | 16.668 km/h |
| 10 kn | 18.52 km/h |
| 15 kn | 27.78 km/h |
| 20 kn | 37.04 km/h |
| 25 kn | 46.3 km/h |
| 30 kn | 55.56 km/h |
| 40 kn | 74.08 km/h |
| 50 kn | 92.6 km/h |
| 75 kn | 138.9 km/h |
| 100 kn | 185.2 km/h |
| 250 kn | 463 km/h |
| 500 kn | 926 km/h |
| 1000 kn | 1,852 km/h |
Kilometres per hour to Knots
| Kilometres per hour | Knots |
|---|---|
| 1 km/h | 0.54 kn |
| 2 km/h | 1.08 kn |
| 3 km/h | 1.62 kn |
| 4 km/h | 2.16 kn |
| 5 km/h | 2.7 kn |
| 6 km/h | 3.24 kn |
| 7 km/h | 3.78 kn |
| 8 km/h | 4.32 kn |
| 9 km/h | 4.86 kn |
| 10 km/h | 5.4 kn |
What that actually looks like
A conversion factor is hard to judge on its own. These are quantities most people already have a feel for, converted for you:
- A cruising sailboat does about 6 knots — 11.112 km/h
- An airliner cruises around 470 knots — 870.44 km/h
Why both units are still in use
Speed limits are posted in miles per hour in the US and UK and in kilometres per hour nearly everywhere else, which makes this a conversion drivers do in their heads on holiday. Aviation and shipping use knots, a third unit entirely, because a knot is one nautical mile per hour and a nautical mile maps neatly onto a minute of latitude.
Mistakes worth avoiding
The rough mental shortcut of adding a half — 50 km/h is about 30 mph — drifts badly at higher speeds. At motorway speeds it is off by enough to matter, so use the real factor when a speed limit is involved.
The other habit worth breaking is rounding too early. Convert first, round once at the end, and you avoid the drift that turns a small approximation into a visible error by the third calculation.
Doing it in your head
When you only need a rough answer, multiply by 9 and divide by 5 — which lands within 2.8 percent of the true value. Ten knots works out at roughly 18 kilometres per hour that way, against 18.52 exactly. An estimate is enough for deciding whether something will fit or whether a figure sounds plausible. When the number has to be right — because you are buying, cooking or building to it — use the calculator and let it carry the decimals.
Common questions
How many kilometres per hour are in one knot?
One knot equals 1.852 kilometres per hour. The calculator above handles any value, including decimals and very large numbers, and updates as you type.
Is this an exact conversion?
Yes — this is an exact defined ratio, not an approximation. The table rounds for readability; the calculator does not.
Does this work offline?
Yes. The conversion runs in your browser with no network request, so it works on a plane, in a basement, or on a phone with no signal once the page has loaded.