MPH to Feet Per Second Calculator

Feet per second is the preferred speed unit in several technical and scientific fields in the United States, even as mph dominates everyday driving and athletics. Ballistics and firearms specifications always express muzzle velocity in feet per second — a rifle bullet traveling at 3,000 fps is far more intuitive for that community than 2,045 mph. Engineers analyzing vehicle crash dynamics use fps because the equations of motion in the US customary system work cleanly in feet and seconds. Sports scientists studying pitch speed in baseball or serve speed in tennis may receive radar gun readings in mph but need fps for kinematic modeling. Hydraulic engineers express fluid velocities in fps when designing pipe systems. Physics students working problems in US customary units must convert given mph values to fps before applying kinematic equations. This calculator uses the exact conversion derived from 5,280 feet per mile and 3,600 seconds per hour.

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.