How do you calculate 200 meter dash speed into mph?

1) There are 1609.34 meters in one mile. 1609.34 is 8.05 times more than 200. So take the time that the runner ran the race in and multiply it by 8.05.

2) There are 3600 seconds in an hour. Divide the product you got from multiplying the race time by 8.05 into 3600 and you will get the MPH of the time.

EXAMPLE: Someone runs the 200 meter race in 20 seconds flat. Multiply 20 seconds by 8.05 and you get 161. Divide 161 into 3600 and you get 22.36. A runner who ran the 200 meters in 20 seconds flat ran at 22.36 MPH.