Convert Feet per Second to Miles per Hour — Instantly
Convert feet per second to miles per hour (mph) instantly using the formula mph = ft/s × 0.681818. Includes a calculator, conversion table, worked examples, and FAQs.
Feet per second to miles per hour converter
Quick Reference
Feet per Second to Miles per Hour Conversion Table
Common ft/s to mph conversions at a glance, using the exact relationship 1 ft/s = 15/22 mph.
| Feet per Second (ft/s) | Calculation | Miles per Hour (mph) |
|---|---|---|
| 1 ft/s | 1 × 0.681818 | 0.681818 mph |
| 5 ft/s | 5 × 0.681818 | 3.409091 mph |
| 10 ft/s | 10 × 0.681818 | 6.818182 mph |
| 15 ft/s | 15 × 0.681818 | 10.227273 mph |
| 20 ft/s | 20 × 0.681818 | 13.636364 mph |
| 25 ft/s | 25 × 0.681818 | 17.045455 mph |
| 30 ft/s | 30 × 0.681818 | 20.454545 mph |
| 40 ft/s | 40 × 0.681818 | 27.272727 mph |
| 50 ft/s | 50 × 0.681818 | 34.090909 mph |
| 60 ft/s | 60 × 0.681818 | 40.909091 mph |
| 80 ft/s | 80 × 0.681818 | 54.545455 mph |
| 100 ft/s | 100 × 0.681818 | 68.181818 mph |
Step-by-Step
How to Convert Feet per Second to Miles per Hour
Converting ft/s to mph is simple when you multiply the speed by 0.681818.
The Formula
Feet per second and miles per hour are both standard units of speed used in motion analysis, engineering, physics, transport, and sports. The exact relationship is 1 ft/s = 15/22 mph.
To convert miles per hour back to feet per second, divide by 0.681818.
How to Turn ft/s into mph — Step by Step
Write down the speed value
Identify the number of feet per second you want to convert — for example, 20 ft/s.
Multiply by 0.681818
20 ft/s × 0.681818 = 13.636364 mph. This gives you the equivalent speed in miles per hour.
Label your answer
Always write the unit (mph) after the number so the result is clear and unambiguous.
ft/s vs mph
What Is the Difference Between Feet per Second and Miles per Hour?
Feet per second and miles per hour are both units of speed. Feet per second are often used in physics, engineering, and motion calculations, while miles per hour are commonly used for road speed and transport in the United States and other regions.
The relationship used on this page is: 1 ft/s = 15/22 mph. To convert feet per second to miles per hour, multiply the number of ft/s by 0.681818.
For example, 10 ft/s = 6.818182 mph, 20 ft/s = 13.636364 mph, and 30 ft/s = 20.454545 mph.
This conversion is exact and is commonly used in speed analysis, engineering, athletics, technical documents, and transport-related calculations.
Worked Examples
Sample ft/s to mph Calculations
Here is how to calculate feet per second to miles per hour for commonly searched values.
5 ft/s to mph
5 × 0.681818 = 3.409091 mph. Five feet per second equals about 3.41 miles per hour.
10 ft/s to mph
10 × 0.681818 = 6.818182 mph. Ten feet per second equals about 6.82 miles per hour.
15 ft/s to mph
15 × 0.681818 = 10.227273 mph. Fifteen feet per second equals about 10.23 miles per hour.
20 ft/s to mph
20 × 0.681818 = 13.636364 mph. Twenty feet per second equals about 13.64 miles per hour.
30 ft/s to mph
30 × 0.681818 = 20.454545 mph. Thirty feet per second equals about 20.45 miles per hour.
40 ft/s to mph
40 × 0.681818 = 27.272727 mph. Forty feet per second equals about 27.27 miles per hour.
50 ft/s to mph
50 × 0.681818 = 34.090909 mph. Fifty feet per second equals about 34.09 miles per hour.
100 ft/s to mph
100 × 0.681818 = 68.181818 mph. One hundred feet per second equals about 68.18 miles per hour.
FAQ
Frequently Asked Questions
Everything you need to know about converting feet per second to miles per hour.