While I can't determine the exact figure, I can provide a reasonable estimate. Generally, it's assumed that countries have at least as many chickens as they have people. With the global population exceeding 7.8 billion, this implies there could be roughly 7.8 billion chickens. However, we must also consider that in several countries, chicken is a dietary staple, leading to potentially more chickens than people. Taking this into account, I would estimate that the total number of chickens worldwide might be around 10 billion.