There is no correct answer to your question.
*Usually* every room has a different rated line. While common rooms have lower rated wires and breakers designed for lightning and light appliances (tvs, etc), kitchen, bathroom, laundry rooms usually have thicker gauge wiring and higher rated lines.
Unless you have your buildings electrical plan or have deeper understanding you'll never know.
If you don't have any high power appliances in the same room, you should be safe with @Set Ready Go 's calculation.