m/s to km/h and km/h to m/s Converter

metres per second to kilometres per hour formula

km/h = m/s × 3.6

1 metre per second = 3.6 kilometres per hour, so multiply metres per second by 3.6. Going the other way, 1 kilometre per hour = 0.2777777778 metres per second.

metres per second to kilometres per hour table

How many kilometres per hour in metres per second?

1 m/s = 3.6 km/h. There are 3.6 kilometres per hour in 1 metres per second.

5 m/s = 18 km/h. There are 18 kilometres per hour in 5 metres per second.

10 m/s = 36 km/h. There are 36 kilometres per hour in 10 metres per second.

20 m/s = 72 km/h. There are 72 kilometres per hour in 20 metres per second.

30 m/s = 108 km/h. There are 108 kilometres per hour in 30 metres per second.

kilometres per hour to metres per second formula

m/s = km/h ÷ 3.6

1 kilometre per hour = 0.2777777778 metres per second, so multiply kilometres per hour by 0.2777777778, or divide by 3.6.

kilometres per hour to metres per second table

How many metres per second in kilometres per hour?

1 km/h = 0.277778 m/s. There are 0.277778 metres per second in 1 kilometres per hour.

36 km/h = 10 m/s. There are 10 metres per second in 36 kilometres per hour.

50 km/h = 13.8889 m/s. There are 13.8889 metres per second in 50 kilometres per hour.

100 km/h = 27.7778 m/s. There are 27.7778 metres per second in 100 kilometres per hour.

120 km/h = 33.3333 m/s. There are 33.3333 metres per second in 120 kilometres per hour.

How the M/s To Km/h works

M/s to km/h: why multiply by 3.6

An object moving at 1 m/s covers 3,600 m in an hour, which is 3.6 km. So m/s × 3.6 = km/h exactly, and km/h ÷ 3.6 = m/s. The factor is one of the few worth memorising, because physics works in metres per second and everything on a road sign or a weather forecast is in kilometres per hour.

Worked example: a 25 m/s wind

25 × 3.6 = 90 km/h. Weather models output metres per second; the forecast you read has been converted. Beaufort force 8, a gale, begins at 17.2 m/s, 62 km/h; force 10, a storm, at 24.5 m/s, 88 km/h; force 12, hurricane, at 32.7 m/s, 118 km/h. The wind that makes walking hard, about 14 m/s, is 50 km/h.

Worked example: a physics answer of 12.5 m/s

12.5 × 3.6 = 45 km/h. A car braking from 45 km/h is the kind of figure an exam question wants back in road units. The reverse trap is worse: a question that gives 60 km/h and asks for stopping distance needs 16.7 m/s in the formula, and using 60 gives an answer thirteen times too large.

Athletics

Usain Bolt's peak speed of 12.4 m/s is 44.7 km/h. His 100 m average of 10.44 m/s is 37.6 km/h. A marathon world record pace of 5.9 m/s is 21.1 km/h, or 2:50 per kilometre. A tennis serve at 60 m/s is 216 km/h; a football free kick at 30 m/s is 108 km/h.

Falling and flight

An object dropped from rest reaches 9.8 m/s after one second, 35 km/h. A skydiver's terminal velocity of 55 m/s is 198 km/h. An airliner at 250 m/s is 900 km/h, and the speed of sound at sea level, 343 m/s, is 1,235 km/h.

Rule of thumb

Multiply by 4 and take off 10%: 30 m/s is 120 − 12 = 108 km/h, which is exact. Or double it, double it again, and subtract a tenth.

Worked example: a 100 km/h car

100 ÷ 3.6 = 27.8 m/s. A braking-distance question that gives the speed in km/h and the deceleration in m/s² needs this step first: at 27.8 m/s and 7 m/s² the stopping distance is v² ÷ 2a = 55 m. Forgetting to convert gives 714 m, and the mistake is easy to spot because it is absurd.

Worked example: a sprinter at 37.6 km/h

37.6 ÷ 3.6 = 10.4 m/s. Usain Bolt's peak in the 2009 100 m final was 12.4 m/s, or 44.7 km/h; his average over the race was 10.44 m/s, 37.6 km/h. A 4-minute-mile pace is 6.7 m/s, 24.1 km/h. Walking at 5 km/h is 1.39 m/s.

Metre per second to kilometres per hour formula and table

The formula on this page is km/h = m/s × 3.6, applied exactly before rounding for display.

How many kilometres per hour in 1 metre per second? 1 m/s is 3.6 km/h. Likewise 5 m/s is 18 km/h, 10 m/s is 36 km/h, 20 m/s is 72 km/h.

Metre per second to kilometre per hour conversion table

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