Safety surfacing area estimator

Protective surfacing is measured from the structure outwards, not from the room edges inwards. Put in the footprint of one structure and the estimator returns the use zone that surfacing has to cover.

The 6 ft use zone and the 9 ft separation above 30 in are the Consumer Product Safety Commission public playground figures, written for outdoor sites. Indoor practice follows the same arithmetic; your local authority has the final say.