There are an estimated billions of potentially habitable planets within the Milky Way galaxy, and possibly trillions across the observable universe. However, it's important to note that "habitable" does not mean "inhabited" and that finding planets with conditions suitable for life is a complex process. Determining habitability involves assessing factors such as temperature, atmospheric composition, water presence, and other elements necessary for life as we know it. Therefore, the precise number of habitable planets remains a matter of ongoing scientific research and speculation.