If you run a 12.3-second 100-meter, your approximate time for the 40-yard dash is 4.5 seconds.
11.72 100 meter time to 40 yard dash
A reliable way to convert a hand-held 100-yard time to an electronic 100-meter time is to multiply the hh-time by 1.103. Therefore, 10.2 in the 100-yard dash time equates to an 11.25 100-meter dash time. Also, to convert an electronic 100-yard dash time to an electronic 100-meter dash time, multiply the first time by 1.088. For example, a 10.20 electronic 100-yard time equates to an 11.10 electronic 100-meter dash time.
11.6 in 100 meters is 4.2 (4.242816) seconds in the 40-yard dash.
A 12.07 time in the 100-meter dash is equivalent to 11.03 seconds in the 100-yard dash.
A 9.6 second time in the 100 yard dash is the same as running the 100 meters in 10.5 seconds.
A 10.8 second time in the 100 yard dash converts to 11.81 seconds in the 100 meters.
A 10.49 100m converts to a 9.592 in the 100-yard dash.
around 9.5 seconds