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Speed Converter

Convert between km/h, mph, m/s, knots, ft/s and Mach - results shown for all units at once.

UnitValue

Mach value is at sea level, 20°C (343 m/s).

Use Cases

When to Convert Speed

Road Speed

Convert speed limits between km/h and mph when driving in a different country.

Aviation & Maritime

Convert between knots, km/h and mph for flight speeds and marine navigation.

Physics Problems

Convert between m/s and km/h for kinematics and motion calculations in school or work.

Sports & Athletics

Convert cricket ball speeds from km/h to mph for international broadcasting comparisons.

Running & Cycling

Convert treadmill speed (km/h) to mph or your cycling pace to m/s for training apps.

Aerospace

Understand Mach numbers and supersonic speeds in units you are familiar with.

FAQ

Speed Conversion Questions

1 mph = 1.60934 km/h exactly (since 1 mile = 1.60934 km). Quick rule: 60 mph ≈ 97 km/h, 100 km/h ≈ 62 mph.

1 knot = 1 nautical mile per hour = 1.852 km/h exactly. This is used by ships and aircraft worldwide.

Multiply m/s by 3.6. This works because 1 km/h = 1000 m / 3600 s = 1/3.6 m/s. Example: 10 m/s × 3.6 = 36 km/h.

At sea level and 20°C, the speed of sound is approximately 343 m/s = 1,235 km/h = 767 mph. It decreases at higher altitudes where the air is colder and thinner.

Knots are directly linked to nautical miles, which are based on Earth's geometry (1 nautical mile = 1 arc-minute of latitude). This makes navigation calculations simpler for maritime and aviation use, since charts use latitude/longitude grids.