When will the last bitcoin be mined? A plain guide to 2140

The last bitcoin will not be mined until about the year 2140. Most of the supply already exists. About 20.09 million of the 21 million cap had been created by 6 October 2026, according to CoinGecko. That leaves roughly 906,000 coins still to come, and they arrive slowly. Not all at once.

That date is a projection, not a line on a calendar. It falls out of two rules baked into Bitcoin's code: a hard limit of 21 million coins, and a mining reward that gets cut in half every four years. Put those together and the final slice of new bitcoin does not finish arriving until the 22nd century.

How many bitcoin are left to mine right now

Fewer than 1 million coins are left to create. CoinGecko put the circulating supply near 20.09 million on 6 October 2026, against the fixed ceiling of 21 million. The gap, about 906,000 coins, is less than 5 percent of the total. Bitcoin crossed the 20 million mark in March 2026, which put more than 95 percent of the total into existence, a milestone The Block reported on 9 March.

Right now the network creates about 450 new coins a day, according to The Block. That pace will not hold. Every four years it drops by half, so the daily trickle keeps thinning until it rounds down to nothing.

Thomas Perfumo, Kraken's global economist, summed up the appeal when supply crossed that mark. "This programmable scarcity, coupled with predictable issuance and decentralized design, is what sets Bitcoin apart from competing forms of money and asset classes," he said.

Passing 20 million in March 2026 was a marker, not a turning point. Supply had been climbing toward it for about 17 years. The 21 million mark is the one the network will never quite reach.

You can check the count yourself. Block explorers such as mempool.space and blockchain.com show the current block height and the total coins issued, refreshed as each new block is found. At 3.125 coins a block and roughly 144 blocks a day, the network mints close to 450 new coins daily, or around 164,000 a year. After the 2028 halving, that yearly figure drops by half again.

Why the cap is 21 million

A hard cap of 21 million was not chosen as a round number. It falls out of the reward schedule itself. Start at 50 coins per block, halve the reward every 210,000 blocks, then add up every block that will ever be mined. That shrinking series sums to just under 21 million. Satoshi Nakamoto, Bitcoin's pseudonymous creator, wrote the limit into the software in 2009, and it has never been raised.

Unlike dollars, which a central bank can print as needed, or gold, whose supply grows a little each year as miners dig more out of the ground, bitcoin's total is fixed in advance. No committee can vote to add more. That fixed ceiling is the feature its supporters point to most often.

Why the last coins take until around 2140

Bitcoin pays miners a reward for each block they add to the chain. A new block lands about every 10 minutes on average, a pace the network keeps steady by adjusting mining difficulty. Every 210,000 blocks, which works out to roughly four years, that reward is cut in half. That event is the halving.

Each new block carries one special payment to the miner who found it. That payment, the block reward plus any fees, is the only way fresh bitcoin is ever created. There is no interest, no bonus supply, no second tap. When the reward reaches zero, the making of new coins stops for good.

Rewards began at 50 coins per block in 2009. They have been cut in half four times since. Today the reward sits at 3.125 coins, down from 6.25 after the April 2024 halving. Each cut shrinks the flow of new supply, and the shrinking compounds.

Because the reward keeps halving, the amount still owed falls toward zero without ever quite reaching it, until the math runs out of satoshis to pay. A satoshi is the smallest unit of a bitcoin, one hundred-millionth of a coin. Once the reward drops below a single satoshi, there is nothing left to issue. That final payment is expected around 2140.

Think of it less as a tank draining and more as a battery that never fully empties. The big discharge already happened. What is left is a long, slow fade.

A slow tail is the whole reason 2140 sits so far out. More than 95 percent of all bitcoin was mined in the first 17 years. The last few percent stretches across another century, because each halving shrinks the payout and the final rewards are tiny fractions of a coin. The Block put the remaining issuance at roughly 114 years when supply crossed 20 million.

Bitcoin's halving schedule, past and future

Bitcoin has gone through four halvings so far. The reward was 50 coins at launch in 2009. It fell to 25 in November 2012, then 12.5 in July 2016, then 6.25 in May 2020, then 3.125 in April 2024. Decrypt set out that schedule when the 2024 cut landed.

A fifth halving is due in 2028. It will cut the reward to 1.5625 coins per block. After that the cuts keep coming, one every four years, each one smaller than the last, until the reward fades out entirely in the 2140s.

Each halving has set a rough four-year rhythm that miners and traders plan around. The dates are not pinned to the calendar, because they track block count, not time. A spell of faster blocks pulls a halving slightly earlier, a spell of slower ones pushes it later. Across 210,000 blocks, those swings mostly even out to about four years.

What miners earn once the rewards stop

New coins are only half of a miner's pay. The other half is transaction fees, the small amounts users attach to move bitcoin. When the block reward finally ends, fees are all that will be left. CoinDesk notes that miners will still be paid at that point, but only through those fees.

Whether fees alone can fund enough mining to keep the network secure is an open question. No one knows what a bitcoin transaction will cost in 2140, or how many people will be sending them. That is more than a century of guesswork, and careful analysts leave it as a guess.

This is the part of Bitcoin's design that draws the most honest debate. Block rewards still pay for most mining today. For fees to carry that load alone, either transaction demand or fee levels would need to run far higher than they do now. That shift, if it comes, is decades away.

Why 21 million is not the real supply

A cap of 21 million is the headline figure. The number of coins people can actually spend is smaller, and it always will be. Lost keys, forgotten wallets, and coins sent to dead addresses pull bitcoin out of circulation for good.

Blockchain analytics firm Chainalysis has estimated that roughly a fifth of all coins mined so far are lost, CoinDesk reported. If that holds, the working supply is closer to 16 million than 21 million. Nobody can say how many of those coins are gone for good and how many will move again one day.

Lost coins make bitcoin scarcer than the headline cap suggests, though the exact figure cannot be proven. A coin is only truly gone when its private key is lost, and there is no registry of lost keys. Estimates lean on coins that have not moved in many years, which is a clue, not proof. Some may yet wake up.

What to watch

Two numbers are worth keeping an eye on. The first is the block reward, which halves again in 2028 and cuts fresh supply in half once more. The second is the share of miner income that comes from fees, because that is what matters long after new coins stop flowing.

For most people, 2140 is not a date to plan around. It is a reminder of how Bitcoin was built: a fixed supply, released on a schedule no single person can change. The slow finish is the design, not a flaw.