High School Dude,
Stick to body weight and force required to lift x weight , y distance.
Stay away from
or any other human biological aspects to calculate force output required. I could give you a dozen physiological and anatomical components one would have to factor according to the individual assigned to the equation. None of them, I or any others on this site would be able to accurately calculate or even acquire with all the anthropometric measurements necessary.
Many of the forum members (the physicists unlike myself) will gladly and easily provide you with the simple answer if you stick to the generic based question.