Converters
Speed Converter
Convert between km/h, mph, m/s, knots, and ft/s simultaneously with exact, standards-based factors.
| Meters/second (m/s) | 1 |
| Kilometers/hour (km/h) | 3.6 |
| Miles/hour (mph) | 2.236936 |
| Knots (kn) | 1.943844 |
| Feet/second (ft/s) | 3.28084 |
Anchored conversions from Meters/second (m/s) use exact internationally agreed factors. Everything is computed locally, instantly.
Knots, Mach and Other Non-Decimal Cases
Most speed units scale by round factors, but two common ones do not: one knot is exactly 1.852 km/h (it is a nautical mile per hour, inherited from navigation), and Mach is not a fixed speed at all — Mach 1 depends on air temperature and drops from about 1,235 km/h at sea level to roughly 1,060 km/h at 11,000 m. The converter treats Mach 1 at sea level, standard conditions; aviation and aerodynamics contexts should confirm which Mach reference they need.
How the Conversion Works
- Enter a speed in any supported unit.
- All other units update at once — useful when sources mix units (weather vs navigation vs athletics).
- Factors derive from exact definitions: 1 mi = 1609.344 m, 1 kn = 1852 m/h.
- Context hints flag typical regimes: walking, city driving, highway, jet cruise.
Conversion Example
Common Questions
Why is a knot based on 1852 meters?
It is one nautical mile per hour, and the nautical mile is defined as exactly 1852 m — derived historically from one minute of latitude.
Which unit do scientists use?
Meters per second (m/s) is the SI unit; km/h is accepted for everyday use. Both are shown.
Related Converters
Length & Distance Converter
Convert between all common metric and imperial length units with exact, internationally agreed conversion factors — every unit shown at once.
Download & Upload Time Calculator
Calculate download and upload times for any file size — covering game downloads, video uploads, and cloud backups — with real-world protocol overhead.
MB/s to Mbps Converter
Convert file transfer metrics into required network bandwidth.