Direct answer
How Many mph in 1 ft/s? 1 ft/s ≈ 0.681818 mph
1 foot per second equals about 0.681818 miles per hour (exactly 15/22). Ballistics and physics answer with converter links.
Question
How many miles per hour are in one foot per second?
1 foot per second (ft/s) equals approximately 0.681818 mph (exactly 15/22).
1 ft/s
≈ 0.681818 mph
Formula
mph = ft/s × 15/22
100 ft/s
≈ 68.182 mph
Explanation
There are 5280 feet in a mile and 3600 seconds in an hour, so mph = ft/s × 3600 ÷ 5280 = ft/s × 15/22.
Multiply mph by 22/15 to get ft/s.
Example: 100 ft/s ≈ 68.182 mph.