Speed Converter
Convert speed measurements between common units.
How It Works
- 1Enter a value.
- 2Choose the units to convert from and to.
- 3See the result instantly.
Features
- 5 common speed units, including knots
Privacy
All conversions happen instantly in your browser using fixed conversion factors.
About Speed Converter
Speed is distance over time, so every unit here is really a length unit paired with a time unit: kilometers per hour, miles per hour, meters per second, and knots, which measure nautical miles per hour. Knots exist because a nautical mile is tied to one minute of latitude, which made it convenient for sea and, later, air navigation long before GPS.
Typical uses include converting a car's speedometer reading between mph and km/h when driving in a different country, making sense of wind speeds in weather reports that are often given in knots or km/h depending on the source, and checking aircraft or boat speed specifications.
Because a nautical mile (about 1.852 km) is longer than a standard mile (1.609 km), a given number of knots converts to a noticeably higher number of km/h or mph than the same number would suggest at a glance — it's a common source of confusion when reading maritime or aviation figures.