MPH to Feet Per Second Calculator
Convert miles per hour to feet per second.
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Enter your values and click Calculate
How It Works
The conversion from miles per hour to feet per second is derived from two exact unit relationships: one mile equals exactly 5,280 feet, and one hour equals exactly 3,600 seconds. Dividing 5,280 by 3,600 gives the exact conversion factor of 22/15, which is approximately 1.46667. To convert any mph value to fps, multiply it by this factor. For example, 60 mph × (22/15) = 88 fps exactly. The calculator applies the decimal approximation 1.46667, which is accurate to five decimal places and introduces negligible error for all practical purposes. The result is displayed to four decimal places to support precise scientific and engineering calculations.
Examples
Highway Speed
A car traveling at 60 mph converted for a crash-analysis simulation.
Result: 60 mph = 88 fps exactly.
Baseball Pitch
A 95 mph fastball converted for a trajectory model.
Result: 95 mph ≈ 139.33 fps.
Sprinting Speed
An elite sprinter reaching 25 mph at peak velocity.
Result: 25 mph ≈ 36.67 fps.
Frequently Asked Questions
How many feet per second is 60 mph?
60 miles per hour equals exactly 88 feet per second. This is a useful benchmark: the mph value multiplied by 22/15 gives the exact fps equivalent.
Where is feet per second used instead of mph?
Fps is standard in ballistics for muzzle velocity, in US customary engineering for fluid and structural dynamics, in physics problem sets, and in sports science for biomechanical analysis of movement.
Is this conversion exact?
Yes. Both the foot-to-mile ratio (5,280 feet per mile) and the second-to-hour ratio (3,600 seconds per hour) are exact integers, so the conversion factor 22/15 is exact. The decimal 1.46667 is a rounded approximation of the repeating decimal 1.46̄.