An estimated 3 to 4 million bitcoin are lost forever -- roughly 17% to 20% of the 21 million coins that will ever exist, according to analysis from Chainalysis and CoinLedger. Nobody can count lost coins exactly -- by definition, a lost coin looks identical on-chain to one being held. So every figure here is a sourced estimate, and the honest answer is a range, not a single number.

Lost bitcoin are coins that still sit on the blockchain but can never be spent again because the private keys are gone -- forgotten passwords, discarded hard drives, deaths without a recovery plan, and abandoned early wallets. This page pulls together the current estimates, explains how analysts arrive at them, and covers the famous losses and the giant dormant stash that dominates the math.

The most-cited range is 3 to 4 million BTC, which CoinLedger puts at "up to 20% of total supply." An early and widely quoted Chainalysis study landed near the top of that range at roughly 3.7 million BTC. Other analysts are more conservative -- some models put the firmly lost figure closer to 1.5 to 2.5 million once you separate "lost" from "just being held for a very long time."

Here is how the leading estimates compare:

The spread comes from methodology, not disagreement about the blockchain itself -- everyone sees the same coins. What differs is how aggressively each model assumes a long-dormant coin is lost rather than dormant on purpose. Chainalysis's widely quoted ~3.7 million dates from an earlier study and sits at the high end because it leans toward classifying old, unmoved coins as lost; conservative on-chain models like Glassnode's, which weight the possibility that dormant coins are simply held, land nearer 1.5 to 2 million. As of mid-2026, the honest read is a range of roughly 3 to 4 million on the loose definition and 1.5 to 2.5 million on the strict one -- an educated estimate with a wide error bar, not a hard count.

Analysts cannot see inside anyone's head, so they infer loss from on-chain behavior. Two signals do most of the work:

• Coins that have never moved in a very long time. The longer a coin sits untouched, the likelier its keys are gone. Per CoinLedger, roughly 2.95 million BTC (about 14% of supply) has been inactive for 10 years or more. Not all of it is lost -- some belongs to patient long-term holders -- but a large share almost certainly is.
• Coins provably destroyed. Some bitcoin is sent to "burn" addresses with no known private key, or locked by malformed transactions. These are unambiguously gone.

Firms like Chainalysis and Glassnode refine these signals with clustering algorithms and UTXO-age analysis -- grouping addresses into likely wallets, then weighing how probable it is that each cluster is abandoned. The result is always a probability-weighted estimate, never a hard count.

The single biggest block of never-moved bitcoin belongs to Bitcoin's pseudonymous creator. Satoshi Nakamoto is estimated to hold roughly 1.1 million BTC, spread across more than 20,000 early addresses, all mined in 2009 and 2010 and never spent. The 1.1 million figure comes from the "Patoshi Pattern" -- a distinctive mining fingerprint that researcher Sergio Demian Lerner traced to a single dominant early miner, as CoinGecko explains -- and on-chain trackers like Arkham Intelligence confirm the cluster of roughly 22,000 addresses has never recorded an outbound transaction.

Those coins have sat untouched for over 15 years. Whether they count as "lost" is a judgment call: Satoshi may still hold the keys, or may be deceased with no heir able to access them. Because the stash is so large -- more than 5% of all bitcoin that will ever exist -- how you classify it swings the total lost figure by more than a million coins on its own. Most estimates treat the Satoshi coins as effectively out of circulation regardless of the label.

A handful of individual losses have become crypto folklore -- and they illustrate exactly how keys disappear:

• James Howells -- ~8,000 BTC. The Welsh IT worker threw away a hard drive containing the private keys to about 8,000 BTC in 2013, and it now sits buried in a Newport landfill. He spent years trying to get permission to dig for it; in January 2025 the UK High Court dismissed his claim, and the council has moved toward closing the site. The coins are, for all practical purposes, gone.
• Stefan Thomas -- 7,002 BTC. The programmer was paid 7,002 BTC in 2011 and stored the keys on an encrypted IronKey drive -- then lost the paper with the password. The drive locks permanently after ten wrong guesses, and he is down to his last couple of tries, as widely reported.
• Mt. Gox -- ~850,000 BTC. The collapsed exchange lost around 850,000 BTC in its 2014 hack -- roughly 750,000 belonging to customers and 100,000 of its own -- of which about 200,000 were later found in an old wallet, per Wikipedia's Mt. Gox record. Strictly, this is theft rather than key-loss, and creditor distributions of the recovered coins are ongoing -- so we do not count it in the core "lost forever" total. It is included here because it is the losses people most often ask about, and it shows how a single failure can strand hundreds of thousands of coins for a decade.

Individually these are jaw-dropping. Collectively they are a rounding error next to the dormant supply and the Satoshi coins -- the real driver of the lost-bitcoin total is millions of small, quietly abandoned wallets, not a few famous disasters.

Lost coins make Bitcoin scarcer than its 21 million cap implies. If 3 to 4 million BTC are truly unrecoverable, the effective supply -- the coins that can actually change hands -- is closer to 17 to 18 million and shrinking. BitGo has noted that in the current era, coins lost each year can outpace the new bitcoin being mined, an "invisible burn" that tightens supply on top of the halving schedule.

This is one reason Bitcoin is often described as deflationary: unlike a company that can issue more shares, there is no mechanism to replace a lost coin. Every forgotten key permanently reduces the float. (For the flip side of the supply story -- how much is left to mine -- see our guide on how many Bitcoin are left to mine.)

A few honest caveats every writer citing these numbers should carry:

• Dormant is not the same as lost. A coin that has not moved in a decade may belong to a disciplined long-term holder, not a dead wallet. Models estimate the split; they cannot prove it.
• Addresses are not people. One person can control many wallets, and one lost seed phrase can strand dozens of addresses at once. (See our note on how many people own Bitcoin for the wallet-vs-person distinction.)
• The Satoshi coins dominate. Include them and the total jumps by ~1.1 million; exclude them and it drops. Always state whether a figure counts them.
• Estimates move. As old coins occasionally wake up and move -- and they sometimes do -- analysts revise the lost figure down. Treat any number as current-best, not final.

The irony of lost bitcoin is that the biggest risk to your coins is often you -- a misplaced seed phrase or a dead drive. The safer your holdings sit, the less you actually use them. A crypto debit card narrows that gap by letting you spend from a funded balance without moving your entire cold-storage stash around. You keep the bulk in self-custody and load only what you plan to spend.

SolCard is built for exactly this: top up with bitcoin or stablecoins, get a Visa or Mastercard, and spend at millions of merchants -- without exposing your long-term holdings. If you are weighing how to actually use your coins day to day, our guides on how to pay with crypto and whether you can spend Bitcoin like cash walk through the mechanics.

An estimated 3 to 4 million BTC -- roughly 17% to 20% of the 21 million maximum supply -- are believed to be permanently lost, according to Chainalysis and CoinLedger. More conservative models put the firmly lost figure at 1.5 to 2.5 million. Because a lost coin is indistinguishable on-chain from a held one, every figure is an estimate.

Roughly 17% to 20% of Bitcoin's eventual 21 million supply is estimated lost. As a reference point, about 2.95 million BTC (around 14% of supply) has not moved in 10 years or more, per CoinLedger -- a large portion of which is likely, though not certainly, lost.

Satoshi's roughly 1.1 million BTC -- a figure from the "Patoshi Pattern" analysis, per CoinGecko -- sit across more than 20,000 addresses that have never moved since 2009-2010, as Arkham Intelligence tracks. Whether they are "lost" is unknown -- Satoshi may hold the keys or may be unreachable. Most analysts treat them as effectively out of circulation.

Almost never. Without the private key, there is no way to move a coin -- there is no password-reset or central authority. Losses tied to forgotten passwords on encrypted drives (like Stefan Thomas's IronKey) or physically destroyed media (like James Howells's landfill drive) are effectively permanent.

It makes them scarcer. If 3 to 4 million BTC are unrecoverable, the effective spendable supply is closer to 17 to 18 million rather than 21 million. BitGo notes that lost coins can outpace newly mined ones, tightening supply further.

• Chainalysis (via Decrypt) -- Nearly 3.7 Million Bitcoin Lost Forever
• CoinLedger -- How Much Bitcoin Is Lost Forever?
• CoinGecko -- Who Is Satoshi Nakamoto? (Patoshi Pattern & 1.1M BTC)
• Arkham Intelligence -- The Richest On-Chain Crypto Individuals
• Wikipedia -- Bitcoin Buried in Newport Landfill (James Howells)
• Webopedia -- Largest Lost Bitcoin Wallets (Stefan Thomas)
• Wikipedia -- Mt. Gox (2014 hack, lost and recovered BTC)
• BitGo -- Bitcoin's Invisible Burn: Lost Coins Outpace New Supply
• Glassnode Studio -- On-Chain Metrics