Convert 100 Foot/Second (ft/s) to Mile/Hour (mph).

100 Foot/Second equals 68.181818 Mile/Hour. Multiply 100 by 0.6818181818.

100 Foot/Second = 68.181818 Mile/Hour

Worked example: converting Foot/Second to Mile/Hour

Step 1 — start with the formula. mph = ft/s × 0.6818181818
Step 2 — substitute your figure. 100 ft/s × 0.6818181818
Step 3 — read the result. 100 ft/s = 68.181818 mph
Step 4 — check it in reverse. ft/s = mph × 1.4666666667 returns 100 ft/s, which matches the figure you started with.

Speed Converter

18 units available

Decimals:

From

To

68.181818

100 ft/s = 68.181818 mph

Formula:

mph = ft/s × 0.6818181818

With your value: 100 ft/s = 68.18181818 mph

How big is that?

Everyday references on a logarithmic scale, all expressed in foot/second so you can sanity-check the result.

Cycling (1/5.5 your value)18.0 ft/s

Urban speed limit (50 km/h) (1/2.2 your value)45.6 ft/s

Cheetah sprint (1/1.1 your value)95.1 ft/s

Your value100 ft/s

Motorway (110 km/h) (1.0× your value)100 ft/s

Airliner cruise (8.2× your value)820 ft/s

Other Foot/Second to Mile/Hour conversions

80 ft/s to mph 85 ft/s to mph 90 ft/s to mph 96 ft/s to mph 120 ft/s to mph 150 ft/s to mph 200 ft/s to mph Full Foot/Second to Mile/Hour converter

Foot/Second to Mile/Hour Conversion Table

Foot/Second (ft/s)	Mile/Hour (mph)
0.5	0.340909
1	0.681818
2	1.363636
5	3.409091
10	6.818182
15	10.227273
20	13.636364
25	17.045455
50	34.090909
100	68.181818
250	170.454545
500	340.909091
1000	681.818182

Mile/Hour to Foot/Second Conversion Table

Mile/Hour (mph)	Foot/Second (ft/s)
0.5	0.733333
1	1.466667
2	2.933333
5	7.333333
10	14.666667
15	22
20	29.333333
25	36.666667
50	73.333333
100	146.666667
250	366.666667
500	733.333333
1000	1,466.666667

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Foot/Second (ft/s)

Speed

Exact conversion

Derived quantity: a defined length divided by a defined time interval.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

Mile/Hour (mph)

Speed

Exact conversion

Derived quantity: a defined length divided by a defined time interval.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

How to Convert Foot/Second to Mile/Hour

To convert from Foot/Second (ft/s) to Mile/Hour (mph), multiply the value by 0.6818181818.

Formula: mph = ft/s × 0.6818181818

Reverse: ft/s = mph × 1.4666666667

Step-by-Step Example

Start with your value in Foot/Second. For example: 5 ft/s
Multiply by the conversion factor: 5 x 0.6818181818
The result is: 3.409091 mph

About Foot/Second

The foot/second (ft/s) is a unit of speed and velocity. One foot/second equals 0.3048 metre per seconds. UnitConvertLab converts it against every other speed unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: speed calculations, engineering and science, education.

About Mile/Hour

Miles per hour is the standard unit of speed in the US and UK for vehicles and weather reporting.

Common uses: speed limits (US/UK), vehicle speed, baseball.

Frequently Asked Questions

What is 100 Foot/Second in Mile/Hour?

100 Foot/Second equals 68.181818 Mile/Hour.

How many Mile/Hour are in 1 Foot/Second?

There are exactly 0.6818181818 Mile/Hour in 1 Foot/Second. This means the conversion factor from Foot/Second to Mile/Hour is 0.6818181818.

What is the formula to convert Foot/Second to Mile/Hour?

The formula to convert Foot/Second to Mile/Hour is: mph = ft/s × 0.6818181818. For example, to convert 10 Foot/Second to Mile/Hour, you would multiply 10 by 0.6818181818.

What is a Foot/Second?