Convert metres per second to miles per hour

One metre per second is 2.23693629 miles per hour. To convert any amount, multiply by 2.23693629. Going the other way, one mile per hour is 0.44704 metres per second.

Multiply the metre per second figure by 2.23693629. So mph = m/s × 2.23693629. For a quick mental estimate, multiplying by about 2.24 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 mile per hour is 60 mph is a typical highway speed. Miles per hour is the road-speed unit in the United States and the United Kingdom, and in both it is what appears on the speedometer regardless of what the road signs say elsewhere.

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.