💨 Speed Converter
Enter a value, choose the unit you have and the unit you want. All other common units are listed too.
Converted value
How the Speed Converter works
Each value is converted to a base unit using exact, internationally defined factors, then to the unit you want.
1 mph = 1.609344 km/h · 1 m/s = 3.6 km/h · 1 knot = 1.852 km/h · 1 ft/s = 1.09728 km/h
Step-by-step calculation
- 1Enter the value.
- 2Choose the unit you have and the unit you want.
- 3The value is converted to a base unit with exact factors.
- 4It is converted to your target unit (all others are listed too).
Worked example
60 mph = 96.56 km/h, and 100 km/h = 62.14 mph.
Speed Converter examples
| Value | Converted value |
|---|---|
| 30 | 48.2803 km/h |
| 45 | 72.4205 km/h |
| 60 | 96.5606 km/h |
| 75 | 120.7008 km/h |
| 90 | 144.841 km/h |
Other inputs kept at the calculator's default values. Results calculated by this calculator.
Why use a Speed Converter?
Convert speeds for driving, weather, aviation and running.
Important factors that can affect your results
- Knots are used at sea and in aviation.
- Rounding.
- Mach depends on temperature.
Frequently asked questions
What is a knot?
One nautical mile (1,852 m) per hour, used at sea and in aviation.
How fast is the speed of sound?
About 343 m/s (1,235 km/h) in air at 20 °C.
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Last reviewed November 2026 · How we build and check our tools · Report a problem