There are too many physics factors to take into account. What structure are you jumping from? How high is it? Is there anything that can increase the starting speed. What's at the bottom? (concrete, grass, water, or jagged rocks) Which body part will hit the ground first? You might recognize this high school math problem. I don't know if anybody will find it useful, but it does help with calculations and such.
You might recognized this quadratic equation from high school.
h = At^2 + Bt + C
h is the total height from the ground in ft (US) or m (metric)
A is the Earth's gravity acceleration, always -16 ft/s^2 or -4.9 m/s^2
B is the starting velocity (ft/s or m/s) negative if actively thrown downward, but usually 0 for jumping CTB
C is the starting height (ft or m)
t is time in seconds
A lot of skydivers jump out of the airplane backwards, so they're not seeing the height as they jump. It ties into the "don't look down!" cliche told to mountain climbers. Also, the human body can survive falling from as high as 10 stores; the odds are low, but not zero. Just saying.