Bitcoin's total supply is limited to 21,000,000 coins, and at the moment, there are around 19,701,165 BTC coins in circulation . The supply growth rate of Bitcoin has been decreasing over time, and it is expected to continue decreasing until all 21 million coins are mined . The process of adding new bitcoins to the supply occurs approximately every 10 minutes through mining, and the block rewards are halved every 210,000 new blocks