Bitcoin Halving Explained
Every ~4 years, the rate at which new Bitcoin is created gets cut in half. This is called the halving. It's one of Bitcoin's most important mechanisms, and it's been running flawlessly since 2012.
4
Halvings completed
3.125 BTC
Current block reward
~Apr 2028
Next halving
<0.9%/yr
BTC inflation rate
How Does the Bitcoin Halving Work?
When a Bitcoin miner finds a valid block, they earn a reward: newly created Bitcoin added to their wallet. This block reward is how new Bitcoin enters circulation. In the beginning (2009), the reward was 50 BTC per block.
Bitcoin's code contains a simple rule: every 210,000 blocks, the reward is cut in half. With blocks arriving roughly every 10 minutes, 210,000 blocks takes approximately 4 years. The halving is automatic, triggered by block count, and requires no human decision. No central bank. No committee. Just code.
Every Bitcoin node on the network enforces the halving. When block 840,000 was mined on April 20, 2024, the reward dropped from 6.25 to 3.125 BTC instantaneously. No node accepted any block after that point claiming the old 6.25 BTC reward.
What Happened at Each Bitcoin Halving?
Four halvings have occurred. Here's the full record, with approximate price data. Note that price returns vary, and the sample size is too small to draw reliable conclusions:
| Halving | Date | Block | New reward | Price at halving | Price ~1yr later |
|---|---|---|---|---|---|
| #1 | Nov 28, 2012 | 210,000 | 25 BTC | ~$12 | ~$1,000 |
| #2 | Jul 9, 2016 | 420,000 | 12.5 BTC | ~$650 | ~$2,500 |
| #3 | May 11, 2020 | 630,000 | 6.25 BTC | ~$8,600 | ~$57,000 |
| #4 | Apr 20, 2024 | 840,000 | 3.125 BTC | ~$64,000 | TBD (2025) |
| #5 | ~Apr 2028 | 1,050,000 | 1.5625 BTC | TBD | TBD |
Past price performance doesn't predict future results. These figures are approximate and for educational reference only.
How Does the Halving Affect Bitcoin's Supply and Inflation?
Bitcoin's total supply is capped at 21 million BTC. About 19.8 million have already been mined. The remaining ~1.2 million will be released through the block reward over the next ~114 years, with each halving cutting the issuance rate.
| Era | Block reward | New BTC/year | Annual inflation |
|---|---|---|---|
| 2009-2012 | 50 BTC | ~2,625,000 | ~100% (new asset) |
| 2012-2016 | 25 BTC | ~1,312,500 | ~12% |
| 2016-2020 | 12.5 BTC | ~656,250 | ~4% |
| 2020-2024 | 6.25 BTC | ~328,125 | ~1.7% |
| 2024-2028 | 3.125 BTC | ~164,063 | <0.9% |
| 2028-2032 | 1.5625 BTC | ~82,031 | <0.4% |
Bitcoin's inflation rate is now below 0.9% annually, making it less inflationary than gold (which inflates at ~1.5-2% per year from new mining). After 2028, Bitcoin will be less inflationary than any other money in existence.
What Does the Halving Mean for Bitcoin Miners?
Every halving cuts miners' subsidy revenue in half. If the Bitcoin price stays flat, half the miners become unprofitable overnight. Here's how that plays out:
Short-term: inefficient miners exit
Higher-cost miners with expensive electricity or older hardware shut down. Hash rate drops temporarily. This is visible in the days following each halving.
Medium-term: difficulty adjusts
Bitcoin automatically adjusts mining difficulty every 2016 blocks to maintain ~10-minute block times. When miners exit, difficulty drops, making it profitable for remaining miners again.
Long-term: price compensates
Historically, Bitcoin's price has risen enough after each halving that miners' dollar-denominated revenue eventually recovers. But this isn't guaranteed.
Future: fees become critical
As the block reward shrinks toward zero, transaction fees must sustain miner revenue. The long-term security of Bitcoin depends on a healthy fee market developing. This is an active area of debate.
Frequently Asked Questions
What is the Bitcoin halving?
The Bitcoin halving is a programmed event that cuts the block reward paid to miners in half, approximately every 4 years (every 210,000 blocks). When Bitcoin launched in 2009, miners earned 50 BTC per block. After the first halving (2012), it dropped to 25. Then 12.5, then 6.25, and after the fourth halving in April 2024, the reward is now 3.125 BTC per block. The halving continues until around 2140, when the last Bitcoin is mined.
Why does the Bitcoin halving happen?
The halving is hard-coded into Bitcoin's protocol to enforce its fixed supply schedule. Satoshi Nakamoto designed it so that new Bitcoin enters circulation at a decreasing rate over time, mimicking the scarcity of precious metals. The total supply is capped at 21 million BTC. Without the halving, all Bitcoin would have been mined quickly, eliminating the long-term issuance schedule.
When is the next Bitcoin halving?
The 5th Bitcoin halving is expected around April 2028, when Bitcoin reaches block 1,050,000. The block reward will drop from 3.125 BTC to 1.5625 BTC per block. The exact date depends on the average block time, which fluctuates around the target of 10 minutes.
Does the halving always cause Bitcoin price to rise?
Historically, Bitcoin's price has risen substantially in the 12-18 months following each halving. But correlation isn't causation. Other factors (market conditions, adoption, macro environment) also play major roles. Past performance doesn't guarantee future results, and the market has become more efficient at pricing in expected events. Don't bet money you can't afford to lose on halving price predictions.
What happens when all 21 million Bitcoin are mined?
When the last Bitcoin is mined (around 2140), miners will no longer receive block rewards. They'll rely entirely on transaction fees to earn revenue. Whether those fees are sufficient to maintain network security is an open question that the Bitcoin community debates. By that point, Bitcoin would need sufficient fee revenue to incentivize mining, or the fee market would need to develop differently.
How does the halving affect miners?
The halving immediately cuts miners' revenue in half (in BTC terms). Miners with higher costs get squeezed out, while efficient miners survive. Historically, hash rate dips briefly after halvings as less efficient miners shut down, then recovers as the price rises. The halving is why mining efficiency and electricity cost matter so much for mining economics.
How does the halving affect Bitcoin's inflation rate?
The halving cuts Bitcoin's annual inflation rate in half. Before the first halving, Bitcoin's inflation rate was about 50% per year. Today, after the fourth halving, Bitcoin's annual inflation rate is less than 0.9% and falling. For comparison, gold's annual inflation (from new mining) is about 1.5-2%. Bitcoin is already less inflationary than gold, and becoming more so with each halving.
Can the Bitcoin halving be changed or stopped?
No. The halving schedule is encoded in Bitcoin's consensus rules. To change it would require a hard fork that every node operator, miner, exchange, and wallet would need to adopt. Given that the scarcity schedule is one of Bitcoin's core value propositions, there's essentially no realistic coalition to change it. The halving is as certain as anything in Bitcoin gets.
Is the halving good for Bitcoin holders?
The halving reduces the rate at which new Bitcoin enters circulation. If demand stays constant or grows, and supply growth slows, basic economics suggests price appreciation. For existing holders, this means your share of the total Bitcoin supply increases slightly relative to newly issued coins. Whether this always translates to price gains depends on many factors beyond just supply.
How can I track when the next halving is?
Several websites track the countdown to the next halving based on current block height. The most accurate method is tracking block 1,050,000 (the 5th halving). Sites like Mempool.space show the current block height in real time. The halving happens when the specified block is mined, regardless of calendar date.
Want to Prepare for the Next Halving?
The best preparation is accumulating Bitcoin with a consistent DCA plan and holding it in cold storage before the event.