Method How tall is tall enough?

[Futile]

Hi, first of all it's my first post here. I've lurked around for a while by now and I've seen all the reccomended methods, but thay all seem to require a lot of planning honestly and I'd prefer a quick solution

So my question is, what is the minimum height that would garantuee me death at 100% if I jumped?

I know that jumping may tramautize poeple nearby and I'm sorry for that, but I have to think for myself once in my life

Thank you all in advance