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Feet Per Second to Miles Per Hour Converter

Instant, two-way conversion across common engineering units.

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1 ft/s = 0.68181818 mph(Feet per second → Miles per hour)

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Converting feet per second to miles per hour

To convert feet per second to miles per hour, multiply the value by 0.68181818. Speed conversions appear in wind loading, air velocity in ducts and transport analysis, where codes mix metric and imperial units.

Feet Per Second (ft/s)

Feet per second (ft/s) is the imperial speed unit used in engineering.

Origin
Derived from the international foot of 0.3048 m.
Where it is used
Used for air and water velocity in US mechanical and plumbing design.
Relation to SI
1 ft/s = 0.3048 m/s exactly.

Miles Per Hour (mph)

Miles per hour (mph) is the road and wind speed unit in the US and UK.

Origin
Derived from the statute mile of 1,609.344 m.
Where it is used
Used for design wind speeds in US codes and for traffic and transport data.
Relation to SI
1 mph = 0.44704 m/s exactly.

Frequently asked questions

How many miles per hour are in one foot per second?

1 ft/s equals 0.68181818 mph.

How do I convert feet per second to miles per hour?

Multiply the value by 0.68181818. For example, 10 ft/s equals 6.8181818 mph.

How do I convert back from miles per hour to feet per second?

1 mph equals 1.4666667 ft/s. The converter above works in both directions, so you can type into either field.

Which speed unit do wind load codes use?

Eurocode and most metric standards state basic wind speed in meters per second, while US standards such as ASCE 7 use miles per hour. Check the averaging period as well as the unit.

What is a knot?

One knot is one nautical mile per hour, about 0.514 m/s. It is standard in marine works, aviation and meteorological data.

Is this speed converter free to use?

Yes. Every unit conversion runs in your browser, needs no account and is free for professional use.

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