Convert metres per second to kilometres per hour

One metre per second is 3.6 kilometres per hour. To convert any amount, multiply by 3.6. Going the other way, one kilometre per hour is 0.277777778 metres per second.

Multiply the metre per second figure by 3.6. So km/h = m/s × 3.6. For a quick mental estimate, multiplying by about 3.6 gets you within a percent or so, which is close enough for most everyday purposes.

One metre per second is about walking pace is 1.4 m/s. Metres per second is the SI unit and the one physics uses, because it composes cleanly with the other base units. Wind speeds in meteorology are often reported this way.

One kilometre per hour is 100 km/h is a typical highway limit. Kilometres per hour is the speed-limit unit in every country except the US, the UK and a few small territories.

Yes. Since the 1959 international yard and pound agreement, the imperial and metric systems are related by exact definitions rather than measurements — the inch is exactly 25.4 mm and the pound exactly 0.45359237 kg. Everything derived from those, including this conversion, is therefore exact. Round at the end rather than partway through, since rounding m/s before converting introduces an error the conversion then multiplies.