Multiply the the speed in meters per second by 3,600 to convert to meters per hour. For example, if you have 51 m/s, multiply 51 by 3,600 to get 183,600 meters per hour.
Divide the speed in meters per hour by 1609.344 to convert to mph. In this example, divide 183,600 to get 114.08 mph.
Multiply the speed in meters per second by 2.236936 to convert straight to mph. In this example, multiply 51 by 2.236936 to get 114.08 mph.
Check your answer with an online meters per second-to-miles per hour converter. Enter the speed in meters per second and click "Convert to Miles Per Hour."