Convert Kilometers per hour (km/h) (kmh) to Mach (sea-level approx.) (mach)
Category: Speed
1 kmh = 0.000816 mach
High-precision rounding: 6 decimals
How to convert kilometers per hour (km/h) to mach (sea-level approx.)
We convert by pivoting through the SI base unit for Speed and applying exact factors where applicable.
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Quick conversion table
Handy values for Kilometers per hour (km/h) → Mach (sea-level approx.). Click a value to open that exact result.
Conversion formula
Linear unit conversions use standardized factors; many are exact by definition (e.g., 1 in = 25.4 mm, 1 ft = 0.3048 m).
Common mistakes
- Mixing mph with knots in navigation; 1 kn = 1 nmi/h.
Unit facts
- Kilometers per hour (km/h): Kilometers per hour is the common road-speed unit in most of the world.
- Mach (sea-level approx.): Mach is a ratio to the local speed of sound; key in supersonic/hypersonic flight.
About Speed
Speed combines distance and time. Science favors m/s, drivers see km/h or mph, and navigation uses knots (nautical miles per hour). Context determines the most convenient representation and rounding.
About Kilometers per hour (km/h)
Kilometers per hour (km/h)
Road and vehicle speed standard in most of the world. Convert from m/s by multiplying by 3.6.
History: Adopted with metric traffic systems and signage during 20th-century metrication.
About Mach (sea-level approx.)
Mach
Dimensionless ratio to the local speed of sound (≈343 m/s at 20 °C, sea level). Critical for aerodynamics and compressibility effects.
History: Named after Ernst Mach; value varies with temperature and medium, so ‘Mach 1’ is not a fixed m/s.
Related conversions from kmh
- kmh → knot Knot (kn)
- kmh → ms Meters per second (m/s)
- kmh → mph Miles per hour (mph)
Related conversions to mach
- knot → mach Knot (kn)
- ms → mach Meters per second (m/s)
- mph → mach Miles per hour (mph)