How loud are 1000 people in a room talking?

The loudness of 1,000 people talking in a room can vary, but generally, if they are chatting at a normal conversational level, it can reach around 90-100 decibels. This is similar to the noise level of a busy restaurant or a loud music concert. Prolonged exposure to such levels can be uncomfortable and potentially harmful to hearing. The overall noise level also depends on the acoustics of the room and the number of people actively engaged in conversation.