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Meters per Second to kmh Converter

Convert meters per second to km/h and back — multiply by 3.6. Free, instant, no sign-up, full working shown.

Convert meters per second ⇄ kmh

36 km/h
10 m/s = 36 km/h (1 m/s = 3.6 km/h (exact))

Formula: 10 m/s × 3.6 = 36 km/h

How the meters per second to kmh converter conversion works

The converter applies km/h = m/s × 3.6. An hour holds 3,600 seconds and a kilometre holds 1,000 metres, so metres per second scale up by 3,600 ÷ 1,000. Going the other way, m/s = km/h ÷ 3.6.

Worked example: a 20 m/s wind is 20 × 3.6 = 72 km/h, and hurricane-force wind of 33 m/s is 33 × 3.6 = 118.8 km/h.

For road speeds in miles, use our kmh to mph converter; for speeds at sea, the knots to mph converter.

meters per second to kmh converter questions

How do I convert m/s to km/h?
Multiply by 3.6: km/h = m/s × 3.6. So 10 m/s is 10 × 3.6 = 36 km/h.
Why 3.6?
One hour is 3,600 seconds and one kilometre is 1,000 metres, so the factor is 3,600 ÷ 1,000 = 3.6 — exact.
How do I convert km/h back to m/s?
Divide by 3.6: m/s = km/h ÷ 3.6. So 90 km/h is 90 ÷ 3.6 = 25 m/s.
What is 25 m/s in km/h?
25 × 3.6 = 90 km/h — a strong gale on the Beaufort scale.
How fast is Usain Bolt in km/h?
His peak speed of about 12.27 m/s is 12.27 × 3.6 = 44.172 km/h.

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Sources & official guidance

Estimate only — the m/s to km/h factor is exactly 3.6. See our disclaimer.