Speed converter — km/h, m/s, mph, knots, Mach
This speed converter instantly converts any value to all common speed units: kilometres per hour (km/h), metres per second (m/s), miles per hour (mph), knots (kn) used in aviation and navigation, and Mach number. Enter a value, choose the input unit, and all conversions appear at once.
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How we calculate speed
All values are converted via the common base unit — metres per second (m/s). For km/h: v [m/s] = v [km/h] / 3.6. For mph: v [m/s] = v [mph] × 0.44704. For knots: v [m/s] = v [kn] × 0.514444. For Mach: v [m/s] = v [Mach] × 343 (speed of sound at sea level, 20°C).
Example calculation
100 km/h equals 27.78 m/s, 62.14 mph, 53.99 knots and Mach 0.082. The speed of sound (Mach 1 = 343 m/s) equals 1234.8 km/h, 767.27 mph or 666.74 knots.
Frequently asked questions
How do I convert km/h to m/s?
Divide the km/h value by 3.6. For example, 90 km/h ÷ 3.6 = 25 m/s. The formula is v [m/s] = v [km/h] / 3.6.
What is a knot and where is it used?
A knot is one nautical mile per hour (1 kn ≈ 1.852 km/h ≈ 0.5144 m/s). It is the standard speed unit in maritime and aviation navigation.
What is Mach number and how is it calculated?
Mach number is the ratio of an object's speed to the speed of sound. At sea level, 20°C, Mach 1 = 343 m/s = 1234.8 km/h = 667 knots.
How do I convert mph to km/h?
Multiply the mph value by 1.60934. For example, 60 mph × 1.60934 ≈ 96.56 km/h.
What is the speed of sound in km/h?
At sea level and 20°C, the speed of sound is about 343 m/s, which equals 1234.8 km/h or 667.1 knots.
What speed units are used in everyday life?
Road speeds use km/h (Europe) or mph (USA, UK). Aviation and shipping use knots. Science uses m/s. Supersonic speeds are expressed in Mach.
How do I convert m/s to km/h?
Multiply the m/s value by 3.6. For example, 10 m/s × 3.6 = 36 km/h.
What is the difference between instantaneous and average speed?
Instantaneous speed is speed at a given moment (e.g., a speedometer reading), while average speed is total distance divided by total time. This converter works with instantaneous speed values.
How many km/h and m/s is 1 knot?
1 knot = 1 nautical mile/h = 1.852 km/h = 0.5144 m/s. A ship doing 20 knots travels at 37.04 km/h or 10.29 m/s.
How fast does a commercial plane fly in km/h and Mach?
A typical commercial jet (Boeing 737, Airbus A320) cruises at about 850–900 km/h, roughly Mach 0.78–0.82. The Concorde flew above Mach 2 (over 2400 km/h).
Results are indicative. The Mach conversion uses a standard sea-level value of 343 m/s; actual speed of sound varies with temperature and pressure. Not for navigational use.