km/h to Meters per Second Conversion Chart
Quick-reference chart converting kilometers per hour (km/h) to meters per second (m/s). Covers 1–1,200 km/h — for physics, automotive, aviation, and engineering use.
For a custom value not in this chart, use the interactive Kilometer per Hour to Meter per Second converter.
| Kilometer per Hour (km/h) | Meter per Second (m/s) |
|---|---|
| 1 km/h | 0.277778 m/s |
| 5 km/h | 1.38889 m/s |
| 10 km/h | 2.77778 m/s |
| 20 km/h | 5.55556 m/s |
| 30 km/h | 8.33333 m/s |
| 36 km/h | 10 m/s |
| 40 km/h | 11.1111 m/s |
| 50 km/h | 13.8889 m/s |
| 60 km/h | 16.6667 m/s |
| 72 km/h | 20 m/s |
| 80 km/h | 22.2222 m/s |
| 90 km/h | 25 m/s |
| 100 km/h | 27.7778 m/s |
| 110 km/h | 30.5556 m/s |
| 120 km/h | 33.3333 m/s |
| 130 km/h | 36.1111 m/s |
| 140 km/h | 38.8889 m/s |
| 150 km/h | 41.6667 m/s |
| 180 km/h | 50 m/s |
| 200 km/h | 55.5556 m/s |
| 300 km/h | 83.3333 m/s |
| 400 km/h | 111.111 m/s |
| 500 km/h | 138.889 m/s |
| 1000 km/h | 277.778 m/s |
| 1200 km/h | 333.333 m/s |
Conversion Formula
m/s = km/h ÷ 3.6 km/h = m/s × 3.6 1 km/h = 0.27778 m/s (= 1000 m / 3600 s) 1 m/s = 3.6 km/h Road speed reference (km/h → m/s): 36 km/h = 10 m/s (urban limit, residential) 72 km/h = 20 m/s (rural reference speed) 100 km/h = 27.8 m/s (highway) 120 km/h = 33.3 m/s (EU motorway limit) 130 km/h = 36.1 m/s (France/Italy motorway) Physics anchor: Dividing km/h by 3.6 is EXACT because: 1 km/h = 1000 m ÷ 3600 s = 1/3.6 m/s
Frequently Asked Questions
How many m/s is 100 km/h?
100 km/h ÷ 3.6 = 27.78 m/s. This is the simplest division since 3.6 is exact. 100 km/h = 27.8 m/s — a highway speed that covers 27.8 meters every second.
How many m/s is 120 km/h?
120 km/h ÷ 3.6 = 33.33 m/s. The EU motorway limit of 120 km/h means traffic moves at 33 meters per second — the length of a semi-truck approximately every second.
Why is the km/h to m/s factor exactly 3.6?
Because 1 hour = 3,600 seconds and 1 km = 1,000 meters: 1 km/h = 1,000 m ÷ 3,600 s = 1/3.6 m/s. So dividing km/h by 3.6 always gives m/s exactly. This is one of the cleanest conversions in the SI system.
How do I use km/h to m/s in stopping distance calculations?
Stopping distance (s) = v²/(2a), where v must be in m/s for the formula to work in SI units. If speed is 100 km/h = 27.78 m/s, and deceleration a = 8 m/s² (hard braking): s = 27.78² / (2 × 8) = 771.7 / 16 = 48.2 meters.
What is 1 m/s in km/h?
1 m/s × 3.6 = 3.6 km/h. Walking speed (~1.4 m/s = 5 km/h), cycling (~5.5 m/s = 20 km/h), motorway cruising (~27.8 m/s = 100 km/h). The 3.6× relationship makes m/s to km/h a quick multiplication.
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