5 sats \ 0 replies \ @16d86e9daa 23 Jun \ on: Question on the 17.6% lost BTC bitcoin_beginners
There's no exact answer. One recent estimate is that about 3-4 million bitcoins are lost forever. It is impossible to know an exact number since a lost Bitcoin looks exactly the same on the blockchain as one that is not lost.
A significant portion of Bitcoin is lost forever due to forgotten passwords, lost private keys, or abandoned wallets.