As of 2021, the estimated world population is approximately 7.9 billion people. Of this population, approximately half are female. Therefore, it is estimated that there are roughly 3.95 billion females in the world.

It is worth noting that this estimate is subject to some degree of error, as accurately measuring the world population is a complex and challenging task. Demographers use a variety of methods to estimate the global population, including census data, survey results, and other demographic information. However, due to factors such as incomplete data, disparities in data collection methods, and population growth and migration, it can be difficult to arrive at a precise figure for the number of females in the world.
Despite these challenges, however, there are some key trends and patterns that can help to shed light on the global distribution of females. For example, while the overall ratio of females to males in the world is roughly 1:1, this ratio can vary significantly depending on geographic region, age group, and other factors. In some countries, for instance, the female population may be significantly smaller than the male population due to factors such as sex-selective abortion or infanticide.
Furthermore, females may face various challenges and inequalities in different parts of the world, including limited access to education, healthcare, and economic opportunities, as well as discrimination and violence. Addressing these challenges and promoting gender equality is an important goal for many governments, organizations, and individuals around the world.
In addition to demographic trends and patterns, it is also worth noting that the global female population is diverse and multifaceted, encompassing a wide range of cultures, ethnicities, religions, and backgrounds. Recognizing and celebrating this diversity can help to promote understanding, empathy, and respect among people of different genders and backgrounds.
Overall, while estimating the number of females in the world is a complex and challenging task, it is clear that females represent a significant and diverse segment of the global population. By promoting gender equality and recognizing the diverse contributions and experiences of females, we can work towards building a more inclusive and equitable world for all people.