Miles per hour to feet per second (mph to ft/s) converter

What is a miles per hour to feet per second converter?

A miles per hour to feet per second converter is an online tool that translates a speed expressed in miles per hour (mph) into its equivalent in feet per second (ft/s), and back again. Both units belong to the imperial system, but they describe motion on very different time and distance scales: miles per hour suits road speeds and weather reports, while feet per second is the natural unit for short bursts of motion, ballistics, physics problems, and sports analytics. The converter removes the mental arithmetic and gives you an instant, accurate result in either direction.

How does the converter work?

The converter relies on the fixed relationship between miles and feet and between hours and seconds. One mile equals 5,280 feet, and one hour equals 3,600 seconds. Dividing 5,280 by 3,600 gives the conversion factor that links the two units. Type a value into the miles per hour field and the feet per second field updates automatically; type into the feet per second field and the miles per hour field is recalculated. You can also switch the unit of either field (for example to km/h, knots, or m/s) to compare a single speed across several measurement systems at once.

Formula for conversion

To convert miles per hour to feet per second, multiply by the conversion factor:

$\text{ft/s} = \text{mph} \times \frac{5280}{3600} = \text{mph} \times 1.46667$

To convert feet per second back to miles per hour, multiply by the inverse factor:

$\text{mph} = \text{ft/s} \times \frac{3600}{5280} = \text{ft/s} \times 0.681818$

Conversion table

The table below lists common miles per hour values together with their feet per second equivalents, rounded to four decimal places:

Examples

Example 1: One mile per hour

Convert 1 mph to feet per second using the factor 1.46667:

$1 \text{ mph} \times 1.46667 = 1.46667 \text{ ft/s}$

Example 2: Highway speed

A car travels at 60 mph. To find its speed in feet per second:

$60 \text{ mph} \times 1.46667 = 88 \text{ ft/s}$

This is a well-known textbook result: 60 mph is exactly 88 ft/s.

Example 3: Feet per second back to miles per hour

A runner reaches 22 ft/s. Converting back to miles per hour:

$22 \text{ ft/s} \times 0.681818 = 15 \text{ mph}$

Example 4: Switching the source unit

If you set the first field to km/h and enter 100 km/h, the converter still reports the result in feet per second:

$100 \text{ km/h} = 91.1344 \text{ ft/s}$

Notes

• 60 mph equals exactly 88 ft/s, a handy benchmark for checking other conversions.
• The conversion factor 1.46667 is the same whether you are dealing with cars, projectiles, or wind speed; only the context changes.
• Because both fields accept any unit in their drop-down list, you can compare a single speed in mph, km/h, knots, ft/s, and m/s without re-entering the number.
• Feet per second is preferred in physics and engineering because it pairs cleanly with the imperial acceleration unit ft/s².

Frequently asked questions

How many feet per second are in 1 mph?

One mile per hour equals 1.46667 feet per second. Multiply any mph value by 1.46667 to get the result in ft/s.

Why is 60 mph equal to 88 ft/s?

Because 60 multiplied by the conversion factor 1.46667 equals exactly 88. The numbers work out cleanly thanks to the ratio of 5,280 feet per mile to 3,600 seconds per hour, which is why 60 mph is a common reference speed.

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

Multiply the feet per second value by 0.681818. For example, 22 ft/s times 0.681818 equals 15 mph. You can also use our feet per second to miles per hour converter for the reverse direction.

Can I convert other speed units with this tool?

Yes. Each field offers additional units such as km/h, knots, and m/s, so you can convert between several speed measurements. For a broader range of options, try our speed converter.

Does the converter handle zero and decimal values?

Yes. Entering 0 returns 0 in the other field, and any decimal input is converted precisely, so fractional speeds are no problem.

Is feet per second the same as feet per minute?

No. Feet per second measures distance covered each second, while feet per minute measures distance covered each minute. To convert feet per second to feet per minute you would multiply by 60.