What is the Bitcoin halving
The reward miners receive for each new block is cut in half every 210,000 blocks — about every four years, since a block arrives roughly every 10 minutes. It is designed to slow the issuance of new bitcoin; the maximum supply is 21 million.
Schedule
| # | Date | Block height | Reward |
|---|---|---|---|
| 1 | 2012-11-28 | 210,000 | 50 → 25 |
| 2 | 2016-07-09 | 420,000 | 25 → 12.5 |
| 3 | 2020-05-11 | 630,000 | 12.5 → 6.25 |
| 4 | 2024-04-20 | 840,000 | 6.25 → 3.125 |
| 5 | Estimated (countdown above) | 1,050,000 | 3.125 → 1.5625 |
How the countdown works
It reads the current block height from a public block explorer, multiplies the blocks left until the next multiple of 210,000 by an average of 10 minutes, and shows the estimated moment. Actual timing can shift by days with mining speed.
Caveats
What price did after past halvings is background, not a guarantee. This page provides dates and block data and is not investment advice.
FAQ
When is the next halving?
The countdown shows an estimate from the current block height; it can shift by days with block speed.
Does the price rise at a halving?
Not guaranteed. It slows supply growth, but price depends on demand and many other factors.
Where does the block height come from?
From a public block explorer (mempool.space), fetched by the server every 10 minutes.
What is the maximum supply?
21 million BTC; halvings gradually reduce new issuance.