Kilometers per hour.
km/h to Nautical mile per Seconds Converter — km/h to nmi/s
Convert km/h (km/h) to Nautical mile per Seconds (nmi/s) using the exact conversion factor (1 km/h = 0.000149988 nautical mile per seconds). See the formula, worked examples, conversion table, history, and common uses.
km/h to Nautical mile per Seconds 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.
Distance divided by time.
Result = input x 0.2777777778 / 1852.
Speed uses meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting km/h to Nautical mile per Seconds
km/h and Nautical mile per Seconds both describe speed, and the conversion matters whenever a maritime or aviation speed (knots) needs to be compared against a road speed (mph). km/h is most often used for road speed limits and vehicle speedometers outside the us.
Formula
nautical mile per seconds = km/h × 0.00014998800096
This factor comes from each unit's defined relationship to the category's base unit: 1 km/h equals 0.277777777778 base units, and 1 nautical mile per seconds equals 1852 base units, so dividing one by the other gives the direct km/h-to-nautical mile per seconds factor of 0.00014998800096.
Simple example
1 km/h × 0.000149988001 = 0.000149988 nmi/s
1 km/h = 0.000149988 nautical mile per seconds.
Real-world example
10 km/h × 0.000149988001 = 0.00149988 nmi/s
10 km/h = 0.00149988 nautical mile per seconds.
Conversion table
| km/h (km/h) | Nautical mile per Seconds (nmi/s) |
|---|---|
| 1 km/h | 0.000149988 nmi/s |
| 5 km/h | 0.00074994 nmi/s |
| 10 km/h | 0.00149988 nmi/s |
| 25 km/h | 0.0037497 nmi/s |
| 50 km/h | 0.0074994 nmi/s |
| 100 km/h | 0.0149988001 nmi/s |
Reverse conversion: Nautical mile per Seconds to km/h
0.000149988 nmi/s × 6667.2 = 0.9999999936 km/h
0.000149988 nautical mile per seconds = 0.9999999936 km/h.
km/h = nautical mile per seconds × 6667.2
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.
Understanding the Nautical mile per Seconds (nmi/s)
Distance divided by time.
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 nautical mile per seconds are in 1 km/h?
1 km/h equals 0.000149988 nautical mile per seconds, using the exact defined conversion factor rather than an estimate.
How do I convert km/h to nautical mile per seconds?
Multiply the km/h value by 0.000149988001. The converter above does this instantly to whatever precision you set.
How do I convert nautical mile per seconds back to km/h?
Use the reverse factor: 1 nautical mile per seconds equals 6,667.2 km/h. You can also use the swap control in the converter above to flip the direction instantly.
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.
What is a nautical mile per seconds?
Nautical mile per Seconds (nmi/s) is a unit of speed.
Is the km/h to nautical mile per seconds conversion exact?
Yes. Both km/h and nautical mile per seconds are defined by fixed standards rather than physical artifacts, so the factor of 0.000149988001 used above is exact to as many digits as you choose to display.
Where is the km/h still used today?
Standard road-speed unit worldwide except the US