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Is there room enough under you for the damper to work?
The free height is a sum of five terms — not just the rope length. Enter the figures from your own equipment's marking, and see how much clearance there must be under the anchor point before the equipment can stop you without you hitting anything.
There must be at least
5.65 m
clear under the anchor point — otherwise you hit something before the equipment has stopped you.
That's how it distributes
Fall factor
0.50
The anchor point sits around harness height.
The fall factor is the free fall divided by the rope length. If the anchor point is overhead, it is almost 0. If it is at your feet, it is 2 — and then you fall twice the rope length before the rope even tightens.
What the calculation does not know
Whether the anchor point can support a fall, whether there is something to hit on the way down, and whether you can be lowered down again afterwards — this can only be decided on site. A rescue plan is part of the setup, not something you make when someone is hanging in the harness.
H = h_frit + h_dæmper + h_sele + h_krop + h_margin
fall factor = h_frit / L_line
The result is indicative and an aid tool for estimates and learning. It does not replace design, applicable standards and legislation or a qualified professional's specific assessment. Always check against the source (EN 363 · fall protection system) and actual conditions on the task. See sources & reservations.