If the house is 50 square meters, how to calculate it

The house is 50 square meters, representing the total area (living room, kitchen, bathroom, etc.) equal to 50 square meters
This figure also includes the thickness of the wall and the shared area (such as the corridor), so the actual living area is less than this figure

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1. A house wants to know how many square it is, and is there any formula to calculate it What I want to ask is, if I buy a house, the developer says it is 64 square meters. How can I know it is 64 square meters? Is there any formula? Can you tell me a little bit? I really want to know how to calculate it
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