How to Instantly Convert MPH to FPS While Driving
 The Quick and Easy Math Trick Formula Equation 
Simply divide milesperhour by 2, then multiply the result by 3 to find feetpersecond.
This is the easy, quick math formula or equation to use and gives a usable, fairly accurate answer. Your answer will be accurate within 5%. As an example, 100 mph converts to 150 fps. If one does the more complicated method of math calculation (detailed further down the page), the resulting answer would be 147 fps.
"How many feet per second..." is a math question usually relating to cars and driving. 
Easy Table Conversion from MPH to FPS Examples Chart
Divide by 2, then multiply by 3.
MPH

FPS

10

15

15

22.5

20

30

25

37.5

30

45

35

52.5

40

60

45

67.5

50

75

55

82.5

60

90

65

97.5

70

105

75

112.5

80

120

90

135

100

150

120

180

140

210

160

240

The More Difficult (and More Accurate) Answer
To prove the quick math shortcut conversion calculation works: First. convert MPH (milesperhour) to MPM (milesperminute) by dividing MPH by 60.
 Then convert miles to feet. There are 5,280 feet in one mile, so multiply MPM by 5,280 to get FPM (feetperminute).
 Lastly, convert FPM to FPS (feetpersecond) by dividing by 60.
Examples of the Longhand Math Converting MilesperHour (MPH) to FeetperSecond (FPS)
MPH to FPS Math Conversion Example One
You're going 25 mph. How many feet is that per second?
 Conversion from mph to fps is as follows: If we divide by 60, we get milesperminute (mpm): 25/60 = .416667.
 For accuracy's sake, now is a good time to convert miles to feet. There are 5,280 feet in a mile so we multiply mpm times 5,280 to get feetperminute: 416667 x 5280 = ~2199.99 feetperminute [note: "~" means approximate].
 To convert from feetperminute to feetpersecond (fps), we divide the answer by 60: 2199.99/60 = ~36.667 feetper second.
 This answer is within 5% of the one you get doing the mental easy math way, which says 25 mph divided by 2 and then multiplied by 3 equals 37.5 fps.
MPH to FPS Math Conversion Example Two
65 mph. How many feet per second? Conversion from mph to fps is as follows: If we divide by 60, we get milesperminute: 65/60 = 1.0843333333333.This makes sense. After all, 60 miles an hour is the wellknown mileaminute.
 For accuracy's sake, now is a good time to convert miles to feet. There are 5,280 feet in a mile, so we multiply the milesperminute times 5,280 to get feetperminute: 1.0843333333333 x 5280 = ~5725.28 feetperminute.
 To convert from feetperminute to feetpersecond, we divide the answer by 60: 5725.28/60 = ~95.421 feetper second, which is the answer.
 This coincides within 5% of the table above, which says 65 mph equals 97.5 fps.
MPH to FPS Math Conversion Example Three
120 mph is how many feet per second? Conversion from mph to fps is as follows. If we divide by 60, we get milesperminute: 120/60 = 2.000. This again makes sense; 60 miles an hour is the usual mileaminute. So 120 mph would be 2milesaminute.
 To convert miles to feet. There are 5,280 feet in a mile, so we multiply the milesperminute times 5,280 to get feetperminute: 2 x 5280 = ~10560 feetperminute.
 To convert from feetperminute to feetpersecond, we divide the answer by 60: 10560/60 = ~176 feetper second.
 This number is within 5% of the table above which says 120 mph equals 180 fps.
The Reverse FPS to MPH Math Conversion Examples
Quick way to find reverse, i.e., convert from feetpersecond to milesper hour: divide fps by 3 and then multiply by 2 for mph.Easy Table Conversion from FPS to MPH Examples Chart
FPS

MPH

10

6.67

20

13.33

25

16.67

40

26.68

50

33.33

75

50

100

66.67

150

100

200

133.33

500

333.33

1000

666.67

Doing 20 milesperhour? That is 30 feetpersecond.
The laws of physics seldom take a vacation. Most of these cars would not be able to stop in time. 
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