Converters
Speed Converter
Convert between speed units including km/h, mph, m/s, knots, feet per second, and Mach instantly in your browser.
Free · Runs in your browser · No signup · Files stay on your device
Result
62.1372
How to use
How to use Speed Converter
- 1Enter a speed value in the input field.
- 2Select the source unit (From) and target unit (To).
- 3The converted speed appears instantly. Use Swap to reverse.
Tips
Quick tips
- 1 km/h ≈ 0.621 mph — useful for international driving.
- Mach is calculated at sea level standard conditions (340.3 m/s).
- Knots are used in aviation and maritime navigation (1 knot = 1.852 km/h).
FAQ
Frequently asked questions
How do I convert km/h to mph?
Multiply km/h by 0.621371. For example, 100 km/h ≈ 62.14 mph.
What is a knot?
A knot is one nautical mile per hour (1.852 km/h). It's the standard speed unit in aviation and maritime.
What is Mach 1?
Mach 1 is the speed of sound, approximately 340.3 m/s (1,225 km/h or 761 mph) at sea level and 15°C.
What speed units do cars use?
Most countries use km/h. The US, UK, and a few others use mph on road signs.
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