m/s to km/h Calculator — Metres per Second to Kilometres per Hour
Convert speed from metres per second (m/s) to kilometres per hour (km/h) and other common speed units. The exact conversion factor is 1 m/s = 3.6 km/h.
m/s
1 m/s = 3.6 km/h exactly (multiply m/s by 3.6)
- 1
Conversion factor
3,600 s/h ÷ 1,000 m/km = 3.61 m/s = 3,600 m/h = 3.6 km/h — the factor is exact. - 2
Speed in km/h
10 × 3.6 = 36
How does this calculator work?
1 m/s = 3.6 km/h exactly (multiply by 3.6). Also: 1 m/s ≈ 2.237 mph, ≈ 1.944 knots, ≈ 3.281 ft/s. To reverse: km/h ÷ 3.6 = m/s. The factor 3.6 = 3,600 s/h ÷ 1,000 m/km.
Formula
How this is calculated
The conversion from m/s to km/h is exact and follows directly from the definitions of the units. One metre per second means travelling 1 m in 1 s; in one hour (3,600 s) the same speed covers 3,600 m = 3.6 km. So the multiplier is exactly 3.6.
For the imperial and nautical units: 1 mph is defined as 1,609.344 m per 3,600 s, giving 1 m/s = 3,600 / 1,609.344 ≈ 2.23694 mph. 1 knot is exactly 1,852 m per 3,600 s, giving 1 m/s = 3,600 / 1,852 ≈ 1.94384 knots. 1 foot is exactly 0.3048 m, so 1 m/s = 1 / 0.3048 ≈ 3.28084 ft/s.
M/s is the SI unit for speed and is used in physics, meteorology, and engineering. Km/h is the standard road and rail unit in most countries. The factor 3.6 is exact because both seconds-per-hour (3,600) and metres-per-kilometre (1,000) are exact integer definitions.
Frequently asked questions
Multiply m/s by 3.6 to get km/h. For example, 10 m/s = 10 × 3.6 = 36 km/h. To convert km/h back to m/s, divide by 3.6.
1 m/s = 1 m per second × 3,600 s/h = 3,600 m/h = 3.6 km/h. The factor 3.6 is the ratio of seconds-per-hour (3,600) to metres-per-kilometre (1,000), both exact by definition.
100 km/h ÷ 3.6 ≈ 27.78 m/s. This is useful to remember: highway speed (100 km/h) ≈ 27.8 m/s ≈ 62.1 mph.
Also known as
TG we-Calculate Editorial Team. (2026). m/s to km/h Calculator — Metres per Second to Kilometres per Hour [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/ms-to-kmh-calculator
TG we-Calculate Editorial Team. "m/s to km/h Calculator — Metres per Second to Kilometres per Hour." TG we-Calculate. 2026. https://we-calculate.com/calculator/ms-to-kmh-calculator.
TG we-Calculate Editorial Team, "m/s to km/h Calculator — Metres per Second to Kilometres per Hour," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/ms-to-kmh-calculator
@misc{wecalculate_ms_to_kmh_calculator, title = {m/s to km/h Calculator — Metres per Second to Kilometres per Hour}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/ms-to-kmh-calculator}}, year = {2026}, note = {TG we-Calculate} }
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