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Foot per Second Converter

Convert feet per second (ft/s) to miles per hour, km/h, m/s, knots, Mach and other speed units.

What this tool does

Convert feet per second (ft/s) to miles per hour, km/h, m/s, knots, Mach and other speed units. Type an amount in feet per second, choose the units, and the tool converts it to miles per hour. It offers 12 speed units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 12 options, including Inch per second, Foot per second, Yard per second, Foot per minute, Mile per second, Mile per hour. Starts as Foot per second.
  • To: Choose one of the same 12 units as "From". Starts as Mile per hour.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from feet per second to miles per hour:

  • 1 ft/s ≈ 0.681818 mph
  • 5 ft/s ≈ 3.409091 mph
  • 10 ft/s ≈ 6.818182 mph
  • 50 ft/s ≈ 34.090909 mph
  • 100 ft/s ≈ 68.181818 mph

Multiply the number of feet per second by about 0.681818 to get miles per hour. The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Foot per second: exact by definition. Mile per hour: exact by definition.

Limitations

  • Mach here means the standard-atmosphere sea level value only. At altitude or in warmer or colder air, the same Mach number is a different speed.

FAQs

Q: How many miles per hour is 1 ft/s?
A: One foot per second is about 0.681818 mph (exactly 15/22). Multiply feet per second by 15 and divide by 22 to get miles per hour.
Q: How many ft/s is 60 mph?
A: Sixty miles per hour is exactly 88 ft/s, since a mile is 5,280 feet and an hour is 3,600 seconds.
Q: Which Mach number does the page use?
A: Mach is shown at sea level in the ISO standard atmosphere at 15 °C, where the speed of sound is 340.294 m/s. The real speed of sound changes with air temperature and altitude.

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