How to Calculate Distance Traveled from MPH

Note the speed in miles per hour (MPH) by looking at the speedometer; maintain that speed as you travel, ideally with cruise control engaged. Start the stopwatch.

After the desired period, stop the stopwatch and record the time elapsed.

Convert the time traveled to hours by dividing the number of minutes by 60. For instance, if you traveled for 5 minutes that equals 5/60 = 0.83 hours.

Multiply the number of hours by the speed in miles per hour to find the distance traveled. For example, if you traveled 0.83 hours at a speed of 30 MPH, your distance would be 30 x 0.83 = 2.5 miles.