How many bitcoins are lost forever?

Nobody knows exactly how many bitcoins are lost forever, but most estimates put the figure between about 2.3 million and 4 million BTC. That is a meaningful share of the 21 million coins that will ever exist. The numbers are educated guesses, because the blockchain shows when coins last moved, not whether anyone can still move them.

How is a lost bitcoin estimate made?

Analysts look at coins that have not moved for many years. Bitcoin's public ledger records every transaction, so researchers can group coins by how long they have sat still. The longer coins stay dormant, the more likely it is that the keys are gone.

The method has limits. A coin untouched for ten years may belong to a patient holder rather than someone who lost a hard drive. Each study makes its own assumptions about which dormant coins count as lost, and that is why results differ.

How many bitcoins are permanently lost, according to studies?

Chainalysis gave one of the first widely cited figures in November 2017, estimating 2.78 million to 3.79 million lost BTC, or about 17% to 23% of the coins then in existence, Fortune reported. That estimate assumed roughly 1 million coins linked to Satoshi Nakamoto were lost, a major assumption. See how much bitcoin Satoshi has for more on those coins.

In January 2025, CryptoSlate reported a River study estimating about 1.6 million BTC lost through self-custody mistakes plus about 1.2 million lost in exchange failures such as Mt. Gox. A 2026 BitGo summary of several studies, including from Ledger and Unchained, puts the overall range at about 2.3 million to 4 million BTC.

Can lost bitcoin be recovered?

For coins in a self-custody wallet, generally no. Bitcoin.org states that if you permanently lose access, for example by losing your recovery phrase, nobody can recover the funds, including developers, miners, wallet makers and exchanges. There is no central body that can reissue coins. The guide on what happens if you lose your seed phrase covers the options that do exist, such as finding an old backup.

Lost hardware can also be physically out of reach. James Howells, a Welsh engineer, says a hard drive holding keys to 8,000 bitcoin was thrown away in 2013. In March 2025 the UK Court of Appeal refused his bid to dig up the landfill, Decrypt reported.

Why do lost bitcoins matter?

Lost coins still count toward the 21 million cap, since the protocol has no way to tell them apart. They simply never trade again, which shrinks the supply in practical use. BitGo cites Fidelity Digital Assets data showing that coins unmoved for more than ten years were growing faster than new issuance in 2025. For background on the cap, read why there are only 21 million bitcoin.