Rectangular box in feet—volume in cubic yards (paver base, sandbox, etc.).
Length, width, and depth are treated as feet, so volume is L×W×D cubic feet. Cubic yards use yd³ = ft³ ÷ 27 (three decimals for yd³, one decimal for ft³ in the secondary line).
This calculator uses plain decimal numbers. If a result looks wrong, check whether you used a comma instead of a dot (or vice versa) where the field expects one.