If you're asking about lethality, the general rule is this as others have said: it's not just the height—
it's how you land.
- Around 75–100 feet (23–30 metres) is considered the minimum range where a fall has a high probability of being fatal, assuming you land head or chest first on solid ground.
- Anything above 150 feet (45+ metres) greatly increases the chance of death, but people have survived falls over 200+ feet, usually with horrific injuries.
Landing feet-first or flat increases the chance of survival with paralysis, organ rupture, or brain injury. Head-first or chest-first impact onto concrete or rock is the most reliably fatal positioning.
Into water? Totally different story. From height, water behaves like concrete. If you're falling into water and don't hit it perfectly, you're likely to suffer severe trauma but may drown after impact—but survival is far more likely than hitting solid ground.
There's no guaranteed height. Too many variables: body position, surface, weight, angle, wind, bounce. Even fatal falls aren't always instant.