m/s
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Equivalent speed
Accurate conversion between km/h and m/s — the two most common metric speed units
Convert kilometres per hour to metres per second instantly with precise calculations. Includes reverse m/s to km/h conversion, mph, ft/s, knots, full formula reference, and speed reference tables for 2026.
Professional speed conversion for physics, engineering, sports science, meteorology, and transport applications
Convert kilometres per hour to metres per second using the exact conversion factor: 1 km/h = 1 ÷ 3.6 m/s ≈ 0.27778 m/s. Equivalently, multiply the km/h value by 1,000 and divide by 3,600 (the number of seconds in one hour). For example, 100 km/h = 27.778 m/s. Our tool also outputs mph, ft/s, and knots for a complete speed breakdown in one step.
Switch seamlessly between km/h to m/s and m/s to km/h conversion modes. Whether you are converting a vehicle speed from a speedometer reading in km/h to m/s for a physics calculation, or converting wind speed or projectile velocity from m/s back to km/h for reporting, both directions are handled instantly from a single input value with no extra steps required.
Essential for physics and engineering calculations, sports performance analysis, meteorology and wind speed reporting, road safety research, fluid dynamics, projectile motion, aviation, and scientific research in 2026. The metre per second (m/s) is the SI unit of speed, while km/h is used for everyday transport — knowing how to convert between them is a fundamental skill in science and engineering.
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The kilometre per hour (km/h) is a unit of speed expressing the number of kilometres travelled in one hour. It is the standard unit for road speed limits and vehicle speedometers in most countries that use the metric system, including Australia, Europe, Canada, and most of Asia and Africa. One km/h equals exactly 1,000 metres per 3,600 seconds, which simplifies to 1/3.6 metres per second.
The metre per second (m/s) is the SI (International System of Units) base unit of speed and velocity. It is used in scientific, engineering, and physics contexts because it works directly within the SI framework without conversion factors. Wind speed in meteorology, fluid velocity in engineering, and all physics equations for kinematics use m/s as the standard unit. You can also explore related conversions at concretemetric.com.
1 km/h = 0.27778 m/s = 0.62137 mph = 0.53996 knots = 0.91134 ft/s
Use the reference table below for quick kilometres per hour to metres per second lookups. Common speed values are listed covering walking pace, urban roads, highways, trains, and aircraft. On mobile, a card layout is displayed for easy reading.
| km/h | m/s | mph | ft/s | Knots | Common Reference |
|---|---|---|---|---|---|
| 1 km/h | 0.278 m/s | 0.621 mph | 0.911 ft/s | 0.540 kn | Slow shuffle |
| 5 km/h | 1.389 m/s | 3.107 mph | 4.557 ft/s | 2.700 kn | Brisk walk |
| 10 km/h | 2.778 m/s | 6.214 mph | 9.113 ft/s | 5.400 kn | Jogging pace |
| 20 km/h | 5.556 m/s | 12.427 mph | 18.227 ft/s | 10.799 kn | Cycling (casual) |
| 30 km/h | 8.333 m/s | 18.641 mph | 27.340 ft/s | 16.199 kn | Residential speed limit |
| 40 km/h | 11.111 m/s | 24.855 mph | 36.453 ft/s | 21.598 kn | School zone limit |
| 50 km/h | 13.889 m/s | 31.069 mph | 45.567 ft/s | 26.998 kn | Urban speed limit |
| 60 km/h | 16.667 m/s | 37.282 mph | 54.680 ft/s | 32.397 kn | Rural road limit |
| 80 km/h | 22.222 m/s | 49.710 mph | 72.907 ft/s | 43.197 kn | Open road limit |
| 100 km/h | 27.778 m/s | 62.137 mph | 91.134 ft/s | 53.996 kn | Highway speed limit |
| 110 km/h | 30.556 m/s | 68.351 mph | 100.247 ft/s | 59.395 kn | Motorway limit (AU) |
| 120 km/h | 33.333 m/s | 74.565 mph | 109.361 ft/s | 64.795 kn | Motorway limit (EU) |
| 150 km/h | 41.667 m/s | 93.206 mph | 136.701 ft/s | 80.994 kn | High-speed train |
| 200 km/h | 55.556 m/s | 124.274 mph | 182.268 ft/s | 107.991 kn | Fast train / Shinkansen |
| 300 km/h | 83.333 m/s | 186.411 mph | 273.403 ft/s | 161.987 kn | Maglev train |
| 900 km/h | 250.000 m/s | 559.234 mph | 820.210 ft/s | 485.961 kn | Jet aircraft (cruise) |
| 1,224 km/h | 340.000 m/s | 760.558 mph | 1,115.486 ft/s | 661.166 kn | Speed of sound (Mach 1) |
The km/h to m/s conversion is one of the most frequently used speed conversions in physics and engineering. Follow these steps for any km/h to m/s calculation in 2026:
Common conversions to remember: 36 km/h = 10 m/s. 72 km/h = 20 m/s. 90 km/h = 25 m/s. 100 km/h = 27.78 m/s. 108 km/h = 30 m/s. The trick: any multiple of 3.6 km/h gives a whole number in m/s — e.g., 3.6 km/h = 1 m/s, 7.2 km/h = 2 m/s, and so on.
An average person walks at approximately 5 km/h (1.39 m/s) and jogs at 8–12 km/h (2.22–3.33 m/s). Usain Bolt's world record 100m sprint average was 37.58 km/h (10.44 m/s), with a peak speed of approximately 44.72 km/h (12.42 m/s) during his 9.58-second world record in 2009.
Urban speed limits are typically 50 km/h (13.89 m/s) in Australia and most of Europe. Motorway limits are 100–130 km/h (27.78–36.11 m/s). The land speed record stands at 1,227.985 km/h (341.11 m/s), set by Andy Green in the Thrust SSC jet car in 1997, breaking the sound barrier on land.
Commercial jet aircraft cruise at approximately 900–950 km/h (250–264 m/s), close to but below the speed of sound. The speed of sound at sea level is approximately 1,224 km/h (340 m/s) or Mach 1. Concorde cruised at Mach 2 — approximately 2,179 km/h (605.3 m/s) — cutting transatlantic crossing time in half.
Meteorologists measure wind in both km/h and m/s. A gentle breeze is 12–19 km/h (3.3–5.3 m/s). A strong gale reaches 75–88 km/h (20.8–24.4 m/s). Category 5 hurricane-force winds exceed 252 km/h (70 m/s). Weather forecasts in Australia commonly use km/h, while scientific meteorology uses m/s.
Conventional trains operate at 100–200 km/h (27.78–55.56 m/s). Japan's Shinkansen bullet trains reach 320 km/h (88.89 m/s) in regular service. The current record for a wheeled train is 574.8 km/h (159.67 m/s), set by a French TGV in 2007. Maglev trains have reached 603 km/h (167.5 m/s) in testing.
Olympic 100m freestyle swimming record pace is approximately 8.6 km/h (2.39 m/s). Tour de France cyclists average 40–50 km/h (11.1–13.9 m/s) on flat stages and sprint at up to 80 km/h (22.2 m/s). Formula 1 cars reach top speeds of 370 km/h (102.8 m/s) and corner at lateral g-forces exceeding 5g at speeds above 200 km/h (55.6 m/s).
The factor of 3.6 comes from the unit definitions: 1 kilometre = 1,000 metres, and 1 hour = 3,600 seconds. So 1 km/h = 1,000 m ÷ 3,600 s = 1/3.6 m/s ≈ 0.27778 m/s. Conversely, 1 m/s = 3,600 m per hour ÷ 1,000 = 3.6 km/h. This is why dividing km/h by 3.6 always gives m/s, and multiplying m/s by 3.6 always gives km/h — a relationship worth memorising for quick mental conversions. For time-related conversions, see days to minutes converter.
Speed is a scalar quantity — it has magnitude only (e.g., 100 km/h). Velocity is a vector quantity — it has both magnitude and direction (e.g., 100 km/h due north). In everyday use and on speedometers, "speed" and "velocity" are used interchangeably, but in physics and engineering, the distinction matters. The unit m/s is used for both speed and the magnitude of velocity. When direction is also specified, the unit remains m/s but the value becomes a velocity vector.
Understanding km/h to m/s conversion is critical in road safety research. At 100 km/h (27.78 m/s), stopping distance including reaction time exceeds 70 metres. Even a small increase in speed dramatically increases stopping distance and crash impact energy, since kinetic energy increases with the square of velocity.
Explore Time Converters →In kinematics, all standard equations (v = u + at, s = ut + ½at², v² = u² + 2as) require speed in m/s and time in seconds to produce results in SI units. Converting from km/h to m/s before applying these formulas avoids errors in calculated distances, times, and forces. Always convert to SI units first.
Atmospheres to Pascals →The metre per second (m/s) is the coherent SI unit of speed. The kilometre per hour (km/h) is a non-SI unit accepted for use with the SI system. 1 km/h = 1000/3600 m/s = 5/18 m/s exactly. Both units are used across different professional fields and it is essential to know when to apply each in 2026.
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