Shotcrete Volume Calculator

Net Volume (yd³), the volume that actually stays in place, comes only from Surface Area and Thickness -- it is unaffected by Rebound Rate or Overspray, because those two percentages describe material lost on the way to the wall, not the finished volume itself. Surface Area and Thickness enter as a straightforward product, so each has an identical proportional effect on Net Volume: doubling either one doubles it. Rebound Waste (yd³) is Net Volume multiplied by Rebound Rate, so it moves in lockstep with whichever changes Net Volume, plus it responds directly to Rebound Rate itself -- shifting from wet-mix shotcrete's typical 5-15% rebound to dry-mix's 15-30% roughly doubles or triples the wasted material for the same wall.

Total Volume to Order stacks Net Volume, Rebound Waste, and Overspray together, so Surface Area and Thickness still drive most of the swing, while Rebound Rate and Overspray each add a smaller, independent increment on top. Application Time (hrs) is Total Volume to Order divided by a fixed 4.5 yd³/hr nozzle output, so anything that raises Total Volume to Order raises the crew hours needed in direct proportion. This calculator uses flat industry-typical rates for rebound, overspray, weight, and cost; it does not account for overhead or vertical application, which can raise real rebound well beyond the entered percentage.