How much is 400 square feet into cubic metres?

[Theman]

Can anybody help me in converting 400square feet into cubic metres?I'm looking for a way to ctb using charcoal method and I'm interested in knowing the amount of charcoal needed for my room.The required measurement seems to be 135gm/m3.

 

[ferrie]

400 square feet is about 37 square meters. To convert to cubic meters, you'd need to know cubic feet