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Speed Converter (m/s ↔ km/h)

Convert velocity instantly between Meters per Second, Kilometers per Hour, Knots, and Mach. Essential for physics students and automotive analysis.

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Category Speed & Motion
UnitValue
Meters per Second-
Kilometers per Hour-
Miles per Hour-
Knots-
Feet per Second-
Mach-
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About

Velocity conversion is a fundamental operation in kinematics and navigation. While the SI unit is meters per second, the automotive industry relies on kilometers per hour, and aviation utilizes knots. Confusion between these scales can result in significant navigation errors or incorrect physics homework results. This tool provides a bidirectional reference for these common units plus the speed of sound (Mach) at sea level conditions.

speed converter velocity calculator knots to kmh physics tools mach number

Formulas

Conversion relies on the relationship between distance and time units. Since one hour contains 3600 seconds and one kilometer contains 1000 meters:

1 km/h = 1000 m3600 s ≈ 0.2778 m/s

Conversely, to find km/h from m/s:

vkm/h = vm/s × 3.6

Reference Data

UnitSymbol1 Unit in m/sCommon Usage
Meter per secondm/s1Scientific / SI
Kilometer per hourkm/h0.27778Automotive
Mile per hourmph0.44704US/UK Roads
Knotkn0.51444Maritime / Air
Foot per secondft/s0.30480Imperial
Mach (Sea Level)Ma340.29Supersonic Flight

Frequently Asked Questions

A knot is one nautical mile per hour. One nautical mile is exactly 1852 meters. It is the standard speed unit for all maritime and aviation navigation because it relates directly to degrees of latitude on the Earth's surface.
No. The speed of sound (Mach 1) varies depending on air temperature and density. This tool uses the standard sea-level value of approximately 340.29 m/s (1225 km/h) for conversion purposes.
Meters per second is the coherent derived unit in the SI system. Using m/s allows for direct calculation of Kinetic Energy (1/2mv²) without needing to convert constants, reducing the likelihood of arithmetic errors.