A knot is one nautical mile per hour.
Knots to km/h Converter — kn to km/h
Convert Knots (kn) to km/h (km/h) using the exact conversion factor (1 knots = 1.852 km/h). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Knots to km/h converter
Converter
Speed Converter
Convert road, aviation, marine, lab, and scientific speed units.
Context values
Some unit families need one extra value for a physically accurate result.
Kilometers per hour.
Result = input x 0.5144444444 / 0.2777777778.
Speed uses meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Knots to km/h
Knots and km/h both describe speed, and the conversion matters whenever a maritime or aviation speed (knots) needs to be compared against a road speed (mph). Knots is typically associated with used internationally in maritime navigation and aviation, while km/h is typically associated with standard road-speed unit worldwide except the US.
Formula
km/h = knots × 1.852
This factor comes from each unit's defined relationship to the category's base unit: 1 knots equals 0.514444444444 base units, and 1 km/h equals 0.277777777778 base units, so dividing one by the other gives the direct knots-to-km/h factor of 1.852.
Simple example
1 kn × 1.852 = 1.852 km/h
1 knots = 1.852 km/h.
Real-world example
10 kn × 1.852 = 18.52 km/h
10 knots = 18.52 km/h.
Conversion table
| Knots (kn) | km/h (km/h) |
|---|---|
| 1 kn | 1.852 km/h |
| 5 kn | 9.26 km/h |
| 10 kn | 18.52 km/h |
| 25 kn | 46.3 km/h |
| 50 kn | 92.6 km/h |
| 100 kn | 185.2 km/h |
Reverse conversion: km/h to Knots
1.852 km/h × 0.5399568035 = 1 kn
1.852 km/h = 1 knots.
knots = km/h × 0.539956803456
Knots vs. km/h
| Aspect | Knots | km/h |
|---|---|---|
| Family | Non-SI unit accepted for use with SI (maritime/aviation) | SI-derived (metric) unit |
| Typical use | Ship and boat speed in marine navigation | Road speed limits and vehicle speedometers outside the US |
| Where it's used | Used internationally in maritime navigation and aviation | Standard road-speed unit worldwide except the US |
Understanding the Knots
Knots (kn) measures speed. A knot is one nautical mile per hour; since the nautical mile is exactly 1,852 meters, a knot is exactly 1,852/3,600 m/s. It is classified as a Non-SI unit accepted for use with SI (maritime/aviation).
Where it's used: Used internationally in maritime navigation and aviation
Uses of the Knots today
- Ship and boat speed in marine navigation
- Aircraft airspeed and wind speed reporting in aviation
- Marine weather forecasts (wind speed)
History of the Knots
The knot gets its name from an old nautical method of measuring speed: sailors trailed a 'log line' with evenly spaced knots behind a ship and counted how many knots paid out over a fixed time, giving a direct speed reading in 'knots.'
The nautical mile it's based on was itself standardized internationally in 1929 (the International Nautical Mile, 1,852 m exactly), tying the knot to a precise value still used in shipping and aviation today.
Historical origin. Knots was not the invention of a single named person; it developed through the process described above.
Understanding the km/h
km/h (km/h) measures speed. Kilometers per hour follows directly from the kilometer divided by one hour. It is classified as a SI-derived (metric) unit.
Where it's used: Standard road-speed unit worldwide except the US
Uses of the km/h today
- Road speed limits and vehicle speedometers outside the US
- Weather reporting (wind speed) in most countries
History of the km/h
Km/h is a compound unit with no independent origin story — it follows automatically once the kilometer and hour were each standardized, becoming the default speed unit as metric countries motorized through the 20th century.
Historical origin. km/h was not the invention of a single named person; it developed through the process described above.
Knots — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the knot among accepted non-SI speed units.
km/h — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Basis for compound metric units like km/h.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many km/h are in 1 knots?
1 knots equals 1.852 km/h, using the exact defined conversion factor rather than an estimate.
How do I convert knots to km/h?
Multiply the knots value by 1.852. The converter above does this instantly to whatever precision you set.
How do I convert km/h back to knots?
Use the reverse factor: 1 km/h equals 0.5399568035 knots. You can also use the swap control in the converter above to flip the direction instantly.
What is a knots?
Knots (kn) measures speed. A knot is one nautical mile per hour; since the nautical mile is exactly 1,852 meters, a knot is exactly 1,852/3,600 m/s. It is classified as a Non-SI unit accepted for use with SI (maritime/aviation).
What is a km/h?
km/h (km/h) measures speed. Kilometers per hour follows directly from the kilometer divided by one hour. It is classified as a SI-derived (metric) unit.
Is the knots to km/h conversion exact?
Yes. A knot is one nautical mile per hour; since the nautical mile is exactly 1,852 meters, a knot is exactly 1,852/3,600 m/s. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the knots still used today?
Used internationally in maritime navigation and aviation