Riprap Layer Volume and Tonnage
Cubic yards and tons of stone to order for a riprap layer: volume = area x thickness / 27, tons = area x thickness x unit weight / 2000. A 500 sf outlet apron 2 ft thick is 37 cy and 82.5 tons at solid 165 pcf, but ordering to a placed 130 pcf (voids counted) drops it to 65 tons. The order-quantity companion to riprap-d50.
Formula and source
volume_cy = area_sf x thickness_ft / 27; tons = area_sf x thickness_ft x unit_wt_pcf / 2000.
Layer take-off identity by name (plan area x thickness x unit weight); first-principles volume arithmetic.
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