How can you tell how much weight a wall can hold?

"There is not an only answer because the load a wall can bear ( and eventually the pulling force developed by a rotational momentum) it depends by 4 main factors : materials which it is built , type of constraints which hold the wall, fasteners type and their number, geometry of the hanging area ( load less or more concentrated). In general heavy load can be supported by load bearing wall or if not, partition wall made of strength materials as concrete, bricks and block. The drywall ( they sound empty when knock on them) are not generally suitable for load except that with some bracing and stiffener ( some time too complicated to be economically viable).
BEng Gian Luca D’Anela"

"Hello. Depending on the size of a tv the wall can hold the weight given the correct wall plugs are used. For plasterboard walls you use butterfly plugs which grip the wall from the inside and provide a secure and strong fix.

Thank you
Josh"

"Hire professionals.
You will not regret.
Then you will be in good hands.
Thanks"

"If its a stud wall just find timbers. They are usually are 40 cm apart and fix to timber across width the same size for the bracket you need to fix."

"depending if the wall is hollow or solid use plasterboard butterfly plugs or drill and raw plug solid"

"Firstly you need to check what your wall is made of. Ie. Brick, plasterboard or wood the best way to do this if you can is to knock the wall first to see if it sounds hollow or solid. That will the determine the fixings you will need to use"

"Hi what size tv are you thinking on hanging. If it's a brick wall it will be ok. If it's a plaster board well you can still hang tv but need different wall plugs. Also do not use normal screws to hang bracket."

"Well, that depends on what the wall it’s made of, the stronger the wall is the more weight will hold."