Estimates vary widely. Typically they range from 300 to 500 million people. The highest estimate is about 1.2 to 1.6 billion people. The data is difficult to determine as practices in high population countries such as China which discourage religious activities are not available.
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There is no exact count of how many followers any religion has, since no one goes around asking everyone what they follow, but estimates are that there are between 400 Million to 1.5 Billion Buddhists. Buddhism is the 4th largest religion and the fastest growing in Europe and North America.