Speed Converter: mph, km/h, m/s, knots
Convert speed units — miles per hour, kilometers per hour, meters per second, knots, and Mach number.
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Speed Converter: mph, km/h, m/s, knots Speed is distance divided by time. The unit you use depends on context: road signs use mph or km/h, physics uses m/s, aviation uses knots, and aeronautics uses Mach numbers. Converting between them is multiplication — but knowing which factor to use requires knowing the domain. --- Speed Units and Their Domains | Unit | Symbol | Definition | Used in | |---|---|---|---| | Metre per second | m/s | SI base unit | Physics, science | | Kilometre per hour | km/h | 1 km/h = 1/3.6 m/s | Road, weather | | Mile per hour | mph | 1 mph = 0.44704 m/s | US/UK roads | | Knot | kn, kt | 1 kn = 1 nmi/h = 1.852 km/h | Aviation, maritime | | Mach | M | Ratio to local speed of sound | Aerospace | | Foot per second | ft/s | 1 ft/s = 0.3048 m/s | US engineering | Core…
Frequently Asked Questions
How do I convert mph to km/h?
Multiply mph by 1.60934. For example, 60 mph × 1.60934 = 96.56 km/h. Inverse: divide km/h by 1.60934. A mental shortcut: multiply mph by 1.6 for a slightly low approximation, or add 60% (so 50 mph → 80 km/h).
What is a knot in speed?
A knot is 1 nautical mile per hour = 1.852 km/h = 1.15078 mph. The name derives from the rope knotting method sailors used to measure ship speed: a knotted line was thrown overboard and the number of knots that paid out in 30 seconds indicated speed. Knots are used in aviation and maritime navigation worldwide.
How fast is Mach 1?
Mach 1 is the speed of sound, which varies with temperature and altitude. At sea level and 20°C, Mach 1 ≈ 343 m/s = 1,235 km/h = 767 mph. At 35,000 feet (cruise altitude), Mach 1 ≈ 295 m/s = 1,062 km/h because the air is colder. Commercial jets typically cruise at Mach 0.78–0.85.
How do I convert m/s to km/h?
Multiply m/s by 3.6. For example, 10 m/s × 3.6 = 36 km/h. This exact factor comes from the unit relationship: 1 m/s = 3,600 m/h = 3.6 km/h. The inverse: divide km/h by 3.6 to get m/s.
What is the speed of light in mph?
The speed of light in a vacuum (c) = 299,792,458 m/s = 1,079,252,849 km/h ≈ 670,616,629 mph. Light travels approximately 186,000 miles per second. This is a physical constant — the maximum speed at which information can travel in the universe.
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