Free Fall Calculator
Drop an object from height h and it falls with time t = √(2h/g), hitting the ground at v = g·t. Enter any one value to find the other two (they are linked through g = 9.81 m/s²).
Free Fall Calculator
How to interpret the result
Fall time grows with the square root of height — dropping from 4× the height only doubles the time. Impact velocity grows with the square root of height too, which is why falls get dangerous quickly.
Assumptions
- Released from rest (initial velocity = 0)
- No air resistance
- g = 9.81 m/s², constant over the fall
- Falling straight down from the given height