What Is the Bitcoin Halving?

The Bitcoin Halving, Explained

The Bitcoin halving is an event that cuts the reward miners receive for adding new blocks to the blockchain in half. It happens approximately every four years — specifically, every 210,000 blocks. The most recent halving occurred in April 2024, reducing the block reward from 6.25 BTC to 3.125 BTC.

The halving is important because it directly controls how fast new bitcoin enters circulation. It’s a core part of Bitcoin’s design and one of the key reasons people compare Bitcoin to gold: the supply is limited and gets harder to produce over time.

Why the Halving Exists

Bitcoin’s creator, Satoshi Nakamoto, built a fixed supply into the protocol: there will only ever be 21 million bitcoin. The halving is the mechanism that enforces this limit.

Here’s the logic:

Start with a fixed reward. When Bitcoin launched in 2009, miners received 50 BTC for every block they mined.
Cut it in half on a schedule. Every 210,000 blocks (roughly every four years), that reward is halved.
Approach zero gradually. The rewards get smaller and smaller — 50, 25, 12.5, 6.25, 3.125, and so on — until they become negligible.
Reach the cap. After 32 halvings (around the year 2140), all 21 million bitcoin will have been mined. No new bitcoin will ever be created after that point.

This predictable, transparent supply schedule is fundamentally different from government-issued currencies, where central banks can create more money at any time. With Bitcoin, everyone knows exactly how many coins exist and how many will ever exist.

Complete Halving History and Timeline

Here is every Bitcoin halving that has occurred, along with future projections:

Halving #	Date	Block Height	Block Reward	Total BTC Mined (approx.)	BTC Price at Halving (approx.)
—	Jan 3, 2009	0 (Genesis)	50 BTC	0	$0
1st	Nov 28, 2012	210,000	25 BTC	10,500,000	~$12
2nd	Jul 9, 2016	420,000	12.5 BTC	15,750,000	~$650
3rd	May 11, 2020	630,000	6.25 BTC	18,375,000	~$8,700
4th	Apr 19, 2024	840,000	3.125 BTC	19,687,500	~$64,000
5th	~2028 (est.)	1,050,000	1.5625 BTC	~20,343,750	Unknown
6th	~2032 (est.)	1,260,000	0.78125 BTC	~20,671,875	Unknown

Note: Exact future dates depend on actual block times, which vary slightly from the 10-minute average.

As the table shows, over 19.6 million of the total 21 million bitcoin have already been mined. The remaining ~1.4 million will trickle out over the next century-plus, with each halving slowing the rate further.

How the Halving Affects Mining

The halving has a direct impact on miners because it cuts their primary revenue source in half overnight. Here’s what typically happens:

Immediate Impact

Miner revenue drops by 50% (assuming bitcoin’s price doesn’t change instantly)
Less efficient miners — those with older hardware or higher electricity costs — may become unprofitable
Some miners shut down their machines, temporarily reducing the network’s total computing power (hash rate)

The Adjustment

Bitcoin’s difficulty adjustment mechanism recalibrates within about two weeks, making mining slightly easier if hash rate drops
Surviving miners capture a larger share of block rewards
Historically, Bitcoin’s price has risen significantly in the 12–18 months following each halving, which eventually compensates miners for the reduced reward

Long-Term Trend

As block rewards shrink, transaction fees become an increasingly important part of miner revenue. Eventually, when all 21 million bitcoin have been mined, transaction fees will be the sole incentive for miners. Whether fees alone will be sufficient to secure the network is an active area of discussion in the Bitcoin community.

For a deeper look at how mining works, see our guide on Bitcoin Mining Explained.

Historical Price Impact

One of the most discussed aspects of the Bitcoin halving is its relationship to price. Here’s what happened after each halving:

After the 1st Halving (November 2012)

Price at halving: ~$12
Price one year later: ~$1,000
Gain: roughly 8,000%

After the 2nd Halving (July 2016)

Price at halving: ~$650
Price one year later: ~$2,500
Price at cycle peak (Dec 2017): ~$19,700
Gain to peak: roughly 3,000%

After the 3rd Halving (May 2020)

Price at halving: ~$8,700
Price one year later: ~$56,000
Price at cycle peak (Nov 2021): ~$69,000
Gain to peak: roughly 700%

After the 4th Halving (April 2024)

Price at halving: ~$64,000
The cycle is still unfolding as of early 2026

The Pattern — and Its Limits

A clear pattern emerges: Bitcoin’s price has risen substantially after every halving so far. Proponents argue this makes sense — the halving reduces the rate of new supply entering the market while demand continues to grow. Basic supply and demand.

However, it’s important to note:

Past performance does not guarantee future results. This is a sample size of four events.
Many other factors influence Bitcoin’s price — macroeconomic conditions, regulatory developments, institutional adoption, and market sentiment all play a role.
The percentage gains have diminished with each cycle. As Bitcoin’s market cap grows larger, outsized percentage moves become harder to sustain.
Timing is unpredictable. Even if the price eventually rises, the exact timing, magnitude, and potential drawdowns along the way are impossible to predict.

The halving is a significant supply-side event, but it’s not a guaranteed profit signal. Treat it as one factor among many.

This article is for educational purposes only and should not be taken as financial or investment advice.

Why the Halving Matters Beyond Price

The halving is significant for reasons beyond potential price movements:

Predictable Monetary Policy

Bitcoin’s issuance schedule is known in advance, down to the block. No committee meets to decide interest rates or money supply. This predictability is a core value proposition for people who distrust discretionary monetary policy.

Scarcity as a Feature

The halving mechanically decreases Bitcoin’s inflation rate over time. After the 2024 halving, Bitcoin’s annual inflation rate dropped below 1% — lower than gold’s estimated annual supply increase of 1.5–2%. This makes Bitcoin one of the scarcest monetary assets in existence by this measure.

A Test of the Security Model

Each halving tests whether the network can remain secure as block rewards decrease. So far, the answer has been yes — a combination of price appreciation and growing transaction fees has kept mining profitable. But this will be tested further as rewards continue to shrink.

When Is the Next Bitcoin Halving?

The 5th Bitcoin halving is expected around 2028, when block height reaches 1,050,000. The block reward will drop from 3.125 BTC to 1.5625 BTC.

The exact date is impossible to predict precisely because it depends on how quickly blocks are actually mined (the 10-minute average can vary). Based on current block production rates, most estimates place it sometime in the first half of 2028.

Key Takeaways

The Bitcoin halving cuts the block reward in half every 210,000 blocks (roughly every four years)
It enforces Bitcoin’s fixed supply cap of 21 million coins
Four halvings have occurred so far: 2012, 2016, 2020, and 2024
Historically, Bitcoin’s price has risen significantly in the 12–18 months following each halving — but past performance doesn’t guarantee future results
As block rewards shrink, transaction fees become more important for mining economics
The next halving is expected around 2028

Next Steps

Bitcoin Mining Explained — Understand the mining process in detail
What is Bitcoin? — Go back to the basics
How Bitcoin Works — See the bigger picture of the Bitcoin system