A knot is one nautical mile per hour, exactly 1.852 km/h. Wind speeds in marine forecasts and aircraft speeds are given in knots.
How to use the Knots to km/h Converter
- Type the number of knots into the Knots field. Decimals such as 5 are fine.
- Read the answer in Kilometres per hour – it updates as you type, with no button to press.
- To convert the other way, type into Kilometres per hour and the knots are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only kn ⇄ km/h. Need a different unit? Use the general speed converter, where you can choose any “from” and “to” unit.
How it works
Both units measure speed, so they are always in the same ratio: one knot equals 1.852 kilometres per hour. The calculator multiplies the number of knots you type by 1.852 to give kilometres per hour, and when you type into the kilometres per hour field it divides by the same factor to give knots. Because the ratio never changes, doubling the knots always doubles the kilometres per hour. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
How to convert knots to kilometres per hour
- Write down the value in knots, for example 10 kn.
- Multiply by the conversion factor 1.852 (because 1 knot = 1.852 km/h).
- 10 × 1.852 = 18.52 km/h.
- To go back from kilometres per hour to knots, divide by 1.852 – or multiply by 0.5399568.
kn to km/h conversion table
| Knots | Kilometres per hour | Kilometres per hour | Knots |
|---|---|---|---|
| 1 kn | 1.852 km/h | 1 km/h | 0.5399568 kn |
| 5 kn | 9.26 km/h | 2 km/h | 1.0799136 kn |
| 10 kn | 18.52 km/h | 5 km/h | 2.699784 kn |
| 15 kn | 27.78 km/h | 10 km/h | 5.399568 kn |
| 20 kn | 37.04 km/h | 20 km/h | 10.799136 kn |
| 25 kn | 46.3 km/h | 50 km/h | 26.99784 kn |
| 30 kn | 55.56 km/h | 100 km/h | 53.99568 kn |
| 50 kn | 92.6 km/h | 1,000 km/h | 539.9568 kn |
| 100 kn | 185.2 km/h | ||
| 250 kn | 463 km/h | ||
| 450 kn | 833.4 km/h |
What is a knot?
A knot is one nautical mile per hour, exactly 1.852 km/h. Ships, aircraft and marine weather forecasts use knots.
What is a kilometre per hour?
Kilometres per hour is the unit on road signs and speedometers in most countries. 100 km/h is about 62 mph.
Quick mental conversion
For a fast estimate, multiply knots by about 1.9 to get kilometres per hour; the error is about 2.6%. Use the calculator above when you need the exact figure.
Common mistakes to avoid
Confusing knots with mph, and mbps internet speeds (bits) with mb/s download speeds (bytes).
Formula
1 kn = 1.852 km/h1 km/h = 0.5399568 knkm/h = kn × 1.852Worked example
Inputs — Knots: 10 kn.
Results — Kilometres per hour = 18.52 km/h.
Frequently asked questions
How many km/h is 10 knots?
18.52 km/h.
How many knots is 100 km/h?
About 54 kn.
How do I convert knots to kilometres per hour?
Multiply the number of knots by 1.852. For example, 10 kn × 1.852 = 18.52 km/h.
How do I convert kilometres per hour back to knots?
Divide by 1.852 (or multiply by 0.5399568), or simply type the value into the kilometres per hour field above.
What is 100 kn in kilometres per hour?
100 kn = 185.2 km/h.
What is 5 kn in kilometres per hour?
5 kn = 9.26 km/h.
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between knots and kilometres per hour. To pick any speed unit, use the general speed converter linked under Related calculators.
What formula does the Knots to km/h Converter use?
1 kn = 1.852 km/h.