How to Instantly Convert MPH to FPS When Driving
- The Quick and Easy Math Trick -
Simply divide miles-per-hour by 2, then multiply the result by 3 to find feet-per-second.
This is the easy, quick math way and gives a 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.
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"How many feet per second..." is a math question usually relating to cars and driving. |
Easy Table Conversion from MPH to FPS Examples Chart
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
|
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 calculation works:- First. convert MPH (miles-per-hour) to MPM (miles-per-minute) 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 (feet-per-minute).
- Lastly, convert FPM to FPS (feet-per-second) by dividing by 60.
Examples of the Longhand Math Converting Miles-per-Hour (MPH) to Feet-per-Second (FPS)
Math 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 miles-per-minute: 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 feet-per-minute: 416667 x 5280 = ~2199.99 feet-per-minute [note: "~" means approximate].
- To convert from feet-per-minute to feet-per-second, we divide the answer by 60: 2199.99/60 = ~36.667 feet-per second.
- This answer is within 5% of the one you get doing the easy math, which says 25 mph equals 37.5 fps.
Math Example Two
65 mph. How many feet per second?- Conversion from mph to fps is as follows: If we divide by 60, we get miles-per-minute: 65/60 = 1.0843333333333.This makes sense. After all, 60 miles an hour is obviously equal to a mile-a-minute.
- 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 miles-per-minute times 5,280 to get feet-per-minute: 1.0843333333333 x 5280 = ~5725.28 feet-per-minute.
- To convert from feet-per-minute to feet-per-second, we divide the answer by 60: 5725.28/60 = ~95.421 feet-per second, which is the answer.
- This coincides within 5% of the table above, which says 65 mph equals 97.5 fps.
Math 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 miles-per-minute: 120/60 = 2.000. This again makes sense. After all, 60 miles an hour is a the usual mile-a-minute. So 120 mph would be 2-miles-a-minute.
- To convert miles to feet. There are 5,280 feet in a mile, so we multiply the miles-per-minute times 5,280 to get feet-per-minute: 2 x 5280 = ~10560 feet-per-minute.
- To convert from feet-per-minute to feet-per-second, we divide the answer by 60: 10560/60 = ~176 feet-per second.
- This number is within 5% of the table above which says 120 mph equals 180 fps.
FPS to MPH
Quick way to find reverse, i.e., convert from feet-per-second to miles-per 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 Miles-per-Hour? That Is 30 Feet-per-Second.
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The laws of physics seldom take a vacation. Most of these cars would not be able to stop in time |
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