Calculate heated building volume?

I have been given the building usable area from the energy certificate, which is 277 square meters. Is the heated building volume then approximately three times that? So about 831 cubic meters?

It is not about a 100% exact calculation, just an approximation.

Why not take the 277 m2 x the clear room height? If there are multiple floors, and one of them has sloping ceilings, then take an average?

Why not take the 277 m2 x the clear room height? If there are multiple floors, one of them with sloping ceilings, then take an average?

Is it calculated like this? I don't know, it's a question. So I would have to do, for example:

Ground floor clear room height: 2.5m so 277*2.5 and then also the upper floor: 277*2? Or how is it best calculated?

is it calculated like this? I don't know, it's a question. so I would have to, for example:

Ground floor clear room height: 2.5m so 277*2.5 and then the upper floor: 277*2? Or how is it best calculated?

wait a minute.. Can't I just take the calculation from the "Umbauten Raum" and then simply subtract all the unheated rooms and only include the heated rooms?!

Maybe you could explain exactly what you have in mind? Do you want to estimate a heating load, or where is this all supposed to lead?

Maybe you explain what exactly you intend to do? Do you want to estimate a heating load, or where is this supposed to lead?

Yes, exactly, calculate the heating load for ubaku's heat demand calculator so that I have an approximate idea of what the heating load would be.