Speed Converter

Convert units in the speed converter category with fast, accurate online tools.

About speed units

Speed is distance over time. SI uses m/s; transport commonly uses km/h or mph; maritime/aviation use knots.

Browse common units in this category and learn where they are typically used.

Kilometers per hour (km/h) (kmh)
Kilometers per hour, used on road signs worldwide.
Knot (kn) (knot)
Knot = 1 nautical mile per hour (1.852 km/h).
Mach (sea-level approx.) (mach)
Mach = ratio to local speed of sound (Mach 1 ≈ 343 m/s at sea level).
Meters per second (m/s) (ms)
Meters per second, SI unit of speed.
Miles per hour (mph) (mph)
Miles per hour, used in US/UK road traffic.

Start with some of the most frequently used conversions in this category.

1 knot = 1 nautical mile per hour (1,852 m/h). MPH ↔ km/h factor is 1.609344.

Open a few ready-made examples for common real-world conversions.

Is speed conversion exact?

Many conversions are exact by definition (e.g., 1 in = 25.4 mm, 1 ft = 0.3048 m).

Can I share a specific result?

Yes. Every converter has a clean, shareable URL like /convert/meter-to-foot/2.5.

Explore other measurement categories available on MeasureCalc.