Baseball Home Run calculator

Enter the "Launch Angle" and "Exit Speed" from Statcast:
Launch AngleExit Speed
degrees mph

Enter the "Distance" and Maximum "Height" from Statcast below:
Distance Max HeightTime of Flight Terminal Speed Backspin/lift Factor
ft ft sec

Press the right arrow (→) to calculate the terminal speed and backspin/lift factor from the statcast data.
Press the left arrow (←) to calculate the distance, height and time of flight from the terminal speed and the backspin/lift factor.
The details of the calculation can be found at statcast AJP article.
The statcast home run data can be found at statcast data.

For comparison, average values plus standard deviation of the terminal speed and backspin/lift factor for 50 home runs from the postseason are listed in the table below.

Postseason (year) Terminal Speed (mph) backspin/lift factor
2015 81.5 ± 3.3 0.56 ± 0.08
2016 79.9 ± 3.4 0.55 ± 0.09
2017 82.0 ± 4.3 0.55 ± 0.10
2018 81.0 ± 2.9 0.53 ± 0.09

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