How Many Bitcoins Are There? Understanding Bitcoin’s Supply

There will only ever be 21 million bitcoin, a hard limit written directly into the software and enforced by every computer on the network, but the number that actually exists today is more nuanced than that final cap suggests. This lesson explains Bitcoin’s circulating supply, issuance schedule, and lost coins, with structured lessons from Coin680.

How Many Bitcoins Are There? An In-Depth Overview

Bitcoin’s total supply is capped at 21 million coins, a figure baked directly into the software’s source code since its creation. As of recent years, well over 19 million bitcoin have already been mined, meaning the overwhelming majority of the total supply that will ever exist is already in circulation, with the remainder trickling out slowly over the coming decades.

New bitcoin enters circulation as a reward paid to miners for successfully adding a new block to the blockchain. This reward started at 50 bitcoin per block in 2009 and cuts in half approximately every four years in an event called the halving, a schedule covered in more depth in a dedicated later lesson. Because of this halving schedule, new issuance slows dramatically over time, and the very last bitcoin is not expected to be mined until sometime around the year 2140.

Circulating supply, however, is not quite the same as usable supply. A meaningful, though imprecisely known, number of bitcoin have been permanently lost over the years, through forgotten passwords, discarded hard drives, and early holders who simply misplaced their private keys before Bitcoin had significant value. Because these coins can never be recovered or spent without the private key, many researchers consider the effective usable supply to be somewhat lower than the raw circulating figure suggests.

This combination, a fixed final cap, a slowing issuance schedule, and a permanent pool of lost coins, is central to Bitcoin’s reputation as a scarce, deflationary asset, standing in contrast to fiat currencies whose supply can expand indefinitely at a central bank’s discretion.

Why Does Bitcoin’s Supply Schedule Matter?

Understanding exactly how Bitcoin’s supply grows, and eventually stops growing altogether, helps explain several things that otherwise seem confusing: why miners are paid transaction fees in addition to a shrinking block reward, why some analysts pay close attention to the halving schedule, and why lost coins are treated as economically significant despite never being officially “removed” from the total count.

• Predictable issuance: the schedule for new supply is publicly known years in advance, unlike discretionary monetary policy.
• Shrinking rewards over time: miners increasingly rely on transaction fees as the block reward continues to halve.
• Lost coins reduce effective supply: permanently inaccessible coins function similarly to supply being taken out of circulation forever.
• A firm final cap: no mechanism exists within Bitcoin’s current rules to exceed 21 million coins.

Detailed Analysis of Circulating Supply, Issuance, and Lost Coins

Circulating Supply Today

The exact circulating figure changes block by block as new coins are mined, but it has already passed roughly 19 million, meaning over 90% of Bitcoin’s entire eventual supply has already been issued, even though the network is still relatively young in the context of its full multi-century issuance schedule.

The Issuance Schedule

Block rewards began at 50 bitcoin and have halved multiple times since, each halving roughly four years apart, progressively slowing the rate of new coins entering circulation. This exponentially decreasing schedule means the vast majority of total supply was issued relatively early in Bitcoin’s history, with the final fractions trickling out over well over a century.

Lost Coins

Various research estimates, none official or fully verifiable, suggest a meaningful percentage of mined bitcoin, particularly from the earliest years when coins had little market value, are permanently inaccessible due to lost private keys, discarded storage devices, or early holders who simply stopped caring about small amounts of a then-worthless experimental currency.

Step-by-Step Guide to Tracking Bitcoin’s Supply Yourself

1. Use a reputable block explorer to check the current circulating supply figure directly from blockchain data.
2. Understand the halving schedule so you know roughly when the next reduction in new issuance is expected.
3. Recognize that lost-coin estimates are approximations, not verified facts, since there is no way to definitively distinguish a lost coin from one simply being held long-term.
4. Compare circulating supply to the 21 million cap to get a sense of how close the network is to full issuance.
5. Revisit this periodically, since the exact figures shift with every new block mined.

Common Pitfalls When Thinking About Bitcoin’s Supply

Assuming all 21 million coins are already in circulation. While the majority has been mined, new coins are still being issued gradually and will continue to be for well over a century.

Treating lost-coin estimates as precise, verified numbers. These figures are informed estimates from blockchain analysis, not officially confirmed counts.

Assuming the halving causes an immediate, dramatic price change. While the halving reduces new supply growth, its effect on price plays out over time and is influenced by many other market factors simultaneously.

Confusing circulating supply with “available” supply on exchanges. A large share of circulating Bitcoin is held long-term rather than actively available for sale at any given moment.

Frequently Asked Questions About Bitcoin’s Supply

How many bitcoin are currently in circulation?

More than 19 million bitcoin have been mined as of recent years, out of the eventual 21 million maximum.

When will the last bitcoin be mined?

Based on the current halving schedule, the final fractions of bitcoin are not expected to be mined until around the year 2140.

How many bitcoin have been lost forever?

No one knows for certain, but various research estimates suggest a meaningful portion of early-mined coins are permanently inaccessible due to lost private keys.

Can Bitcoin’s 21 million cap ever be changed?

Technically, changing it would require overwhelming agreement across the entire network to adopt new rules, something that has never happened and is considered extremely unlikely given how central the fixed cap is to Bitcoin’s value proposition.

Continue Your Bitcoin Learning Journey with Coin680

The 21 million cap deserves a closer look on its own, including exactly why that specific number was chosen and how the halving schedule mathematically leads to it. Coin680’s Bitcoin Academy dives into that next.

Disclaimer: The content provided on this page is for informational and educational purposes only and does not constitute financial or investment advice. Cryptocurrency markets are highly volatile and involve significant risk of loss. Always do your own research and consult a licensed financial advisor before making any investment decisions.