Speed Converter
Convert speeds
62.1372
Miles/hour (mph)
27.7778
Meters/second (m/s)
91.1345
Feet/second (ft/s)
53.9958
Knots (kn)
0.08098484
Mach (Ma)
9.2657e-8
Speed of Light (c)
Click any result to use it as input
Speed Converter
Convert speeds
Features
- Convert between km/h, mph, m/s, knots, ft/s, and Mach
- Precise factors: 1 mph = 0.44704 m/s, 1 knot = 0.514444 m/s (1 nmi/h), Mach 1 ≈ 343 m/s at sea level
- Mach number uses standard sea-level speed of sound (~343 m/s at 20 °C / 68 °F)
- Decimal precision configurable
- Runs entirely in your browser
How to use
- Enter your input data in the provided field.
- Configure any options as needed.
- View the results instantly and copy or download the output.
Tips & Best Practices
- Knots and nautical miles per hour are the same thing — knots is the unit, "per hour" is implied.
- Mach number depends on air temperature and altitude; the converter uses sea-level conditions as the reference.
- Highway speed limits: 60 mph ≈ 96.6 km/h · 100 km/h ≈ 62 mph · 120 km/h ≈ 75 mph.
- A passenger jet cruises at Mach 0.78–0.85 (~830–910 km/h at typical altitude).
- Everything is computed locally; no values leave your browser.
FAQ
Is this tool free to use?
Yes, completely free with no registration, no limits, and no hidden costs.
Is my data private?
All processing happens in your browser. No data is ever sent to any server or third party.
Does it work offline?
Once loaded, the tool works entirely offline. All processing is done client-side with JavaScript.
Which browsers are supported?
Works in Chrome, Firefox, Safari, Edge, and all modern browsers on desktop and mobile.
Can I use the results commercially?
Yes, all output is yours to use freely in any personal or commercial project without restrictions.