The amount of bitcoin mined in each block is also the percentage of the total supply that will be mined during that era. 50 Btc 10,500,000 Btc 50% 25 Btc 5,250,000 Btc 25% 12.5 Btc 2,625,000 Btc 12.5% 6.25 Btc 1,312,500 Btc 6.25% 3.125 Btc 656,250 Btc 3.125%