How many sales calls to or from a brokerage become appointments?

400 sales calls will return you 12 qualifying appointments that will result in 8 showings that, if averaged over time, will result in 1 sale. Source: Up and Running in 30 Days (2nd ed., p. 25) by Carla Cross

On the listing side, 400 contacts will result in 4 seller qualifying appointments that will lead to 2 qualified listings of which 1 listing will sell in market time.

Source: Up and Running in 30 Days (2nd ed., p. 25) by Carla Cross