About 918,600 BTC remained to be issued on September 9, 2026. That estimate starts with Bitcoin's 21 million cap and subtracts roughly 20.0814 million BTC created by block 966,117. The answer changes with every block and describes coins not yet issued, not coins available to buy. Lost coins, dormant holdings, and coins held by long-term owners are already issued and therefore do not return to the mining schedule. Use a dated block height whenever quoting the remainder.
Calculate the remainder from the issuance record
A practical formula is:
21,000,000 BTC minus cumulative issued supply equals the approximate amount left to mine.
The Bitcoin.com block explorer showed block height 966,117 late on September 8, 2026 UTC. Applying Bitcoin's subsidy schedule gives cumulative issuance of about 20,081,388.6 BTC at that height, leaving about 918,611.4 BTC relative to the rounded 21 million cap.
That result should be reported as an approximation. Block height advances continuously, individual coinbase transactions can claim less than the maximum subsidy, and the protocol's smallest-unit rounding makes the final theoretical total slightly below the familiar headline cap.
Bit.Fan's explainer on the Bitcoin supply still left to mine gives the broader context. A live answer should always add its observation date.
Understand why the total grows slowly
New Bitcoin enters through the block subsidy included in valid coinbase transactions. The subsidy began at 50 BTC per block and is cut in half every 210,000 blocks. After the 2024 halving at block 840,000, the maximum subsidy became 3.125 BTC per block.
At a long-run average of roughly one block every ten minutes, that is about 144 blocks and 450 new BTC per day. Actual daily issuance varies because block arrival is irregular. The amount left shrinks block by block, while the rate of shrinkage stays approximately constant within a subsidy era.
The official Bitcoin halving page lists the 21 million limit, the 210,000-block interval, the current 3.125 BTC subsidy, and an estimated next halving around 2028.
Do not confuse issued supply with liquid supply
“Left to mine” asks about future protocol issuance. “Circulating supply” usually counts coins already created. “Available supply” may try to estimate coins offered for sale. These are different numbers.
A coin mined in 2010 but untouched since then is still issued. A coin whose private key has been lost is also part of historical issuance even if no one can spend it. An exchange balance can be liquid today and withdrawn tomorrow without changing total issuance.
Therefore, estimates of lost coins should never be subtracted from issued supply and then added to the amount left to mine. Mining does not replace inaccessible coins.
Follow the remaining schedule across halvings
At block 1,050,000, expected around 2028, the subsidy is scheduled to fall from 3.125 to 1.5625 BTC. Each later era adds half as much new supply per block as the prior era. This geometric pattern makes the total approach the cap gradually.
Roughly half of the supply available at the start of any subsidy era is issued during that era, with the rest spread across all later eras. That is why more than 20 million BTC can already exist while issuance continues for over a century.
The commonly cited final period is around 2140. That date is an estimate because calendar time depends on actual block production, while the rule itself is based on block height.
Recalculate without trusting a dashboard label
First record a current block height from a reputable explorer. Second identify the subsidy era by dividing height into 210,000-block intervals. Third sum completed eras and the blocks in the current era. Finally subtract that issuance from the cap.
For a quick public explanation, use rounded numbers: about 20.081 million issued and about 0.919 million remaining as of September 9, 2026. For code, accounting, or research, use satoshis and document how the genesis block, unclaimed subsidies, and rounding are treated.
Two dashboards may differ slightly because they update at different blocks or define “circulating” differently. A difference of several BTC can simply reflect timing; a large difference calls for a methodology check.
Know what happens after issuance ends
Mining performs more than coin creation. Miners assemble transactions, compete to add valid blocks, and receive transaction fees as well as any available subsidy. As subsidies decline, fees form a larger share of block rewards.
No sudden pile of remaining coins is released near the end. The schedule keeps halving until the subsidy rounds down to zero. Network security, mining economics, and fee demand can change along the way, but the calculation of unissued supply remains tied to consensus rules and block height.
The usable answer is therefore dated and defined: approximately 918,600 BTC had not yet been issued at the stated height. It does not measure coins for sale, coins whose owners can still access them, or the amount miners will earn after operating costs.
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