Speed Converter
Convert speed units: km/h to mph, meters per second to km/h, knots to mph. For driving, running, sailing, and aviation.
How to Use
- 1 Enter a speed value in the input field
- 2 Select the unit you're converting FROM
- 3 Select the unit you're converting TO
- 4 See instant results with high precision
- 5 Use swap button to reverse the conversion quickly
What You Get
Convert between 5 speed units: Meters/second, Kilometers/hour, Miles/hour, Knots, Feet/second. All calculations use standard conversion factors with up to 8 decimal places.
Input: 1 m/s
Output: 3.6 km/h
Input: 100 km/h
Output: 27.7778 m/s
How do I convert km/h to mph?
1 km/h = 0.621 mph. Multiply km/h by 0.621. Example: 100 km/h = 62 mph.
How do I convert mph to km/h?
1 mph = 1.609 km/h. Multiply mph by 1.609. Example: 60 mph = 97 km/h.
What is a knot?
1 knot = 1.852 km/h = 1.151 mph. Used in aviation and sailing. Equals 1 nautical mile per hour.
How fast is 100 km/h in mph?
100 km/h ≈ 62 mph. Common highway speed in Europe. US highways are typically 65-75 mph (105-120 km/h).
How do I convert m/s to km/h?
Multiply by 3.6. Example: 10 m/s = 36 km/h. To convert km/h to m/s, divide by 3.6.
What is a typical walking speed?
Average walking: 5 km/h (3.1 mph). Brisk walk: 6.5 km/h (4 mph). Running: 8-12 km/h (5-7.5 mph).
How fast is the speed of sound?
Speed of sound = 343 m/s = 1,235 km/h = 767 mph = 667 knots at sea level and 20°C.
How do I convert feet per second to mph?
1 ft/s = 0.682 mph. Multiply ft/s by 0.682. Used for projectile and vehicle speeds.
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