Use Zone Calculator

No -- only for slides and swings, and even then not uniformly. For a stationary climber/deck or a rotating/spring rider, ASTM F1487's required use zone is a fixed 6 ft clearance on every side of the equipment footprint regardless of platform height, so changing Platform / Pivot Height produces zero change in Use Zone Area for those two types. For slides, Platform Height only moves the exit zone between the 6 ft floor and 8 ft cap -- once past 4 ft of height (this calculator's default is 8 ft) it's pinned flat at the cap. For swings, Platform Height is doubled and applied to both front and back clearance with no cap, so it keeps mattering across the whole declared range and has a much larger effect there.

Only when Equipment Type is set to Slide. The chute's horizontal run is added on top of the equipment footprint (Equipment Length) and the height-based exit zone, since a real slide physically extends past the climbing structure in the direction of travel. For every other equipment type, Slide Chute Length has no effect on the calculated use zone at all.

Because the swing formula doubles the pivot height and applies it to BOTH front and back clearance (2x pivot height in each direction) with no upper limit, while a slide's height-driven exit zone is capped at 8 ft per ASTM F1487/CPSC. An 8 ft pivot height on a swing set adds 32 ft of horizontal clearance from that term alone -- four times the 8 ft the same height figure contributes on a slide, since the slide's exit zone is already sitting at its cap by that height.

Min. Surfacing Depth depends only on Platform / Pivot Height, per CPSC loose-fill surfacing guidelines: it's 9 in for fall heights up to 7 ft, and steps up to 12 in for any height above 7 ft. It does not depend on equipment type, footprint size, or the calculated use zone area.

Two separate ASTM/CPSC limits, both enforced so the calculator never silently understates a requirement or overstates one past what the standard calls for. CPSC's published loose-fill depth table only documents depths up through a 10 ft critical fall height -- 9 in through 7 ft, 12 in through 10 ft -- and does not certify that 12 in is adequate protection past that. Rather than silently reusing that same 12 in figure for equipment up to this calculator's 20 ft maximum height, the flag turns on above 10 ft so it's clear the number shown is the last CPSC-documented value, not a verified depth; use a unitary surface (poured-in-place rubber or rubber tiles) tested per ASTM F1292 to the actual critical fall height instead. Separately, the same ASTM F1487 clause bounds the slide exit zone between a 6 ft minimum and an 8 ft maximum regardless of slide height -- "4 ft plus slide height" only lands inside that 6-8 ft range for Platform / Pivot Height between 2 ft and 4 ft; below 2 ft the calculator enforces the 6 ft floor, and above 4 ft it enforces the 8 ft cap, instead of letting the raw formula return an exit zone that's too small or unboundedly large.