peterarmsec wrote:What is the cubic equivalent of 270 square metres (2906 square feet)?
You can't directly covert square to cubic units as they measure different things. Square units measure area, cubic units measure capacity.
Let's say you have a box. If you know the area of it's floor AND you know it height, you can calculate capacity by multiplying those. But knowing only the floor area you can't get the box capacity as it depends on the height.