Speed Converter
Convert m/s, km/h, mph, knots, ft/s and Mach number.
Speed Converter
| Converted speed | 96.560640 |
| Summary | 60 mph = 96.56064 km/h |
60 mph is 96.56 km/h — which is why a 60 mph speed limit is close to the 100 km/h limits used in much of the world.
Convert speeds through metres per second. One mile per hour is exactly 0.44704 m/s, so multiply mph by 1.609344 to get km/h. A knot is one nautical mile per hour — exactly 1.852 km/h or about 0.514444 m/s.
Mach numbers measure speed relative to the local speed of sound. This converter uses 343 m/s, the speed of sound in air at 20 °C; the true value varies with temperature and altitude, so treat Mach results as approximate.
The formula
Worked example
60 mph is 96.56 km/h — which is why a 60 mph speed limit is close to the 100 km/h limits used in much of the world.
The example is pre-loaded in the result panel — press Calculate with your own numbers to replace it.
Frequently asked questions
How fast is a knot in km/h?
Exactly 1.852 km/h, because a knot is one nautical mile (1852 m) per hour. Knots are used for ships and aircraft.
How do I convert km/h to m/s?
Divide by 3.6. Highway speed of 100 km/h is 27.78 m/s — useful for physics problems.
Why is Mach 1 not a fixed speed?
The speed of sound depends on the medium and its temperature: about 343 m/s in air at 20 °C, but only ~295 m/s at cruising altitude where the air is much colder.
Category: Unit Conversions calculators
Related calculators
Beaufort Scale Converter
Turn wind speed in km/h, mph, m/s or knots into a Beaufort number and description.
Length Converter
Convert mm, cm, metres, kilometres, inches, feet, yards, miles and nautical miles.
Pace Calculator
Running pace per kilometre and per mile, plus speed, from distance and time.
Flow Rate Converter
Convert L/min, L/s, m³/h, US gallons per minute and cubic feet per minute.