Convert volume in Petrograd standard measure to cubic foot (ft³) and cubic metre (m³)
The Petrograd Standard is a British timber measurement used for softwood lumber as a basis of costs, loadings, statistics, etc.
'One Petrograd standard is equal to 1,980 superficial feet, 165 cubic feet or 4.67228 cubic metres'
From the Builders' Estimating, Book published in 1952
Petrograd standard (Ptg.std)= 165 cubic foot (ft³) Petrograd standard (Ptg.std) = 4.67227968768 cubic metre (m³)