"How Much Bitcoin Should I Own?" With only 21 million Bitcoin being available, and a world population of about 7,800 million, I would start with .0026923 Bitcoin. Or, with the USA population at 328 million, a USA Citizen may want to start with .064 Bitcoin. This amount of Bitcoin would give the Citizen an equal average amount of Bitcoin. One whole Bitcoin would put you at 371 or 15+ times the average. Like they say, "when its gone its gone."